Free Bitcoin Generator - Generate BTC for Your Wallet

In the future will it be possible to have a QR code that will be linked to a wallet with an address generator? /r/Bitcoin

In the future will it be possible to have a QR code that will be linked to a wallet with an address generator? /Bitcoin submitted by HiIAMCaptainObvious to BitcoinAll [link] [comments]

Bitcoin Price Ticker with Wallet Watcher, Converter, QR Code Generator, r/Bitcoin and Coindesk news feeds.

Bitcoin Price Ticker with Wallet Watcher, Converter, QR Code Generator, Bitcoin and Coindesk news feeds. submitted by anoderone to Bitcoin [link] [comments]

[Question] I created a wallet at Bitadress.org then I copied the wallet number (public) and pasted it at Blockchain.info but the QR code it generated looks completely different. /r/Bitcoin

[Question] I created a wallet at Bitadress.org then I copied the wallet number (public) and pasted it at Blockchain.info but the QR code it generated looks completely different. /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Ultimate glossary of crypto currency terms, acronyms and abbreviations

I thought it would be really cool to have an ultimate guide for those new to crypto currencies and the terms used. I made this mostly for beginner’s and veterans alike. I’m not sure how much use you will get out of this. Stuff gets lost on Reddit quite easily so I hope this finds its way to you. Included in this list, I have included most of the terms used in crypto-communities. I have compiled this list from a multitude of sources. The list is in alphabetical order and may include some words/terms not exclusive to the crypto world but may be helpful regardless.
2FA
Two factor authentication. I highly advise that you use it.
51% Attack:
A situation where a single malicious individual or group gains control of more than half of a cryptocurrency network’s computing power. Theoretically, it could allow perpetrators to manipulate the system and spend the same coin multiple times, stop other users from completing blocks and make conflicting transactions to a chain that could harm the network.
Address (or Addy):
A unique string of numbers and letters (both upper and lower case) used to send, receive or store cryptocurrency on the network. It is also the public key in a pair of keys needed to sign a digital transaction. Addresses can be shared publicly as a text or in the form of a scannable QR code. They differ between cryptocurrencies. You can’t send Bitcoin to an Ethereum address, for example.
Altcoin (alternative coin): Any digital currency other than Bitcoin. These other currencies are alternatives to Bitcoin regarding features and functionalities (e.g. faster confirmation time, lower price, improved mining algorithm, higher total coin supply). There are hundreds of altcoins, including Ether, Ripple, Litecoin and many many others.
AIRDROP:
An event where the investors/participants are able to receive free tokens or coins into their digital wallet.
AML: Defines Anti-Money Laundering laws**.**
ARBITRAGE:
Getting risk-free profits by trading (simultaneous buying and selling of the cryptocurrency) on two different exchanges which have different prices for the same asset.
Ashdraked:
Being Ashdraked is essentially a more detailed version of being Zhoutonged. It is when you lose all of your invested capital, but you do so specifically by shorting Bitcoin. The expression “Ashdraked” comes from a story of a Romanian cryptocurrency investor who insisted upon shorting BTC, as he had done so successfully in the past. When the price of BTC rose from USD 300 to USD 500, the Romanian investor lost all of his money.
ATH (All Time High):
The highest price ever achieved by a cryptocurrency in its entire history. Alternatively, ATL is all time low
Bearish:
A tendency of prices to fall; a pessimistic expectation that the value of a coin is going to drop.
Bear trap:
A manipulation of a stock or commodity by investors.
Bitcoin:
The very first, and the highest ever valued, mass-market open source and decentralized cryptocurrency and digital payment system that runs on a worldwide peer to peer network. It operates independently of any centralized authorities
Bitconnect:
One of the biggest scams in the crypto world. it was made popular in the meme world by screaming idiot Carlos Matos, who infamously proclaimed," hey hey heeeey” and “what's a what's a what's up wasssssssssuuuuuuuuuuuuup, BitConneeeeeeeeeeeeeeeeeeeeeeeect!”. He is now in the mentally ill meme hall of fame.
Block:
A package of permanently recorded data about transactions occurring every time period (typically about 10 minutes) on the blockchain network. Once a record has been completed and verified, it goes into a blockchain and gives way to the next block. Each block also contains a complex mathematical puzzle with a unique answer, without which new blocks can’t be added to the chain.
Blockchain:
An unchangeable digital record of all transactions ever made in a particular cryptocurrency and shared across thousands of computers worldwide. It has no central authority governing it. Records, or blocks, are chained to each other using a cryptographic signature. They are stored publicly and chronologically, from the genesis block to the latest block, hence the term blockchain. Anyone can have access to the database and yet it remains incredibly difficult to hack.
Bullish:
A tendency of prices to rise; an optimistic expectation that a specific cryptocurrency will do well and its value is going to increase.
BTFD:
Buy the fucking dip. This advise was bestowed upon us by the gods themselves. It is the iron code to crypto enthusiasts.
Bull market:
A market that Cryptos are going up.
Consensus:
An agreement among blockchain participants on the validity of data. Consensus is reached when the majority of nodes on the network verify that the transaction is 100% valid.
Crypto bubble:
The instability of cryptocurrencies in terms of price value
Cryptocurrency:
A type of digital currency, secured by strong computer code (cryptography), that operates independently of any middlemen or central authoritie
Cryptography:
The art of converting sensitive data into a format unreadable for unauthorized users, which when decoded would result in a meaningful statement.
Cryptojacking:
The use of someone else’s device and profiting from its computational power to mine cryptocurrency without their knowledge and consent.
Crypto-Valhalla:
When HODLers(holders) eventually cash out they go to a place called crypto-Valhalla. The strong will be separated from the weak and the strong will then be given lambos.
DAO:
Decentralized Autonomous Organizations. It defines A blockchain technology inspired organization or corporation that exists and operates without human intervention.
Dapp (decentralized application):
An open-source application that runs and stores its data on a blockchain network (instead of a central server) to prevent a single failure point. This software is not controlled by the single body – information comes from people providing other people with data or computing power.
Decentralized:
A system with no fundamental control authority that governs the network. Instead, it is jointly managed by all users to the system.
Desktop wallet:
A wallet that stores the private keys on your computer, which allow the spending and management of your bitcoins.
DILDO:
Long red or green candles. This is a crypto signal that tells you that it is not favorable to trade at the moment. Found on candlestick charts.
Digital Signature:
An encrypted digital code attached to an electronic document to prove that the sender is who they say they are and confirm that a transaction is valid and should be accepted by the network.
Double Spending:
An attack on the blockchain where a malicious user manipulates the network by sending digital money to two different recipients at exactly the same time.
DYOR:
Means do your own research.
Encryption:
Converting data into code to protect it from unauthorized access, so that only the intended recipient(s) can decode it.
Eskrow:
the practice of having a third party act as an intermediary in a transaction. This third party holds the funds on and sends them off when the transaction is completed.
Ethereum:
Ethereum is an open source, public, blockchain-based platform that runs smart contracts and allows you to build dapps on it. Ethereum is fueled by the cryptocurrency Ether.
Exchange:
A platform (centralized or decentralized) for exchanging (trading) different forms of cryptocurrencies. These exchanges allow you to exchange cryptos for local currency. Some popular exchanges are Coinbase, Bittrex, Kraken and more.
Faucet:
A website which gives away free cryptocurrencies.
Fiat money:
Fiat currency is legal tender whose value is backed by the government that issued it, such as the US dollar or UK pound.
Fork:
A split in the blockchain, resulting in two separate branches, an original and a new alternate version of the cryptocurrency. As a single blockchain forks into two, they will both run simultaneously on different parts of the network. For example, Bitcoin Cash is a Bitcoin fork.
FOMO:
Fear of missing out.
Frictionless:
A system is frictionless when there are zero transaction costs or trading retraints.
FUD:
Fear, Uncertainty and Doubt regarding the crypto market.
Gas:
A fee paid to run transactions, dapps and smart contracts on Ethereum.
Halving:
A 50% decrease in block reward after the mining of a pre-specified number of blocks. Every 4 years, the “reward” for successfully mining a block of bitcoin is reduced by half. This is referred to as “Halving”.
Hardware wallet:
Physical wallet devices that can securely store cryptocurrency maximally. Some examples are Ledger Nano S**,** Digital Bitbox and more**.**
Hash:
The process that takes input data of varying sizes, performs an operation on it and converts it into a fixed size output. It cannot be reversed.
Hashing:
The process by which you mine bitcoin or similar cryptocurrency, by trying to solve the mathematical problem within it, using cryptographic hash functions.
HODL:
A Bitcoin enthusiast once accidentally misspelled the word HOLD and it is now part of the bitcoin legend. It can also mean hold on for dear life.
ICO (Initial Coin Offering):
A blockchain-based fundraising mechanism, or a public crowd sale of a new digital coin, used to raise capital from supporters for an early stage crypto venture. Beware of these as there have been quite a few scams in the past.
John mcAfee:
A man who will one day eat his balls on live television for falsely predicting bitcoin going to 100k. He has also become a small meme within the crypto community for his outlandish claims.
JOMO:
Joy of missing out. For those who are so depressed about missing out their sadness becomes joy.
KYC:
Know your customer(alternatively consumer).
Lambo:
This stands for Lamborghini. A small meme within the investing community where the moment someone gets rich they spend their earnings on a lambo. One day we will all have lambos in crypto-valhalla.
Ledger:
Away from Blockchain, it is a book of financial transactions and balances. In the world of crypto, the blockchain functions as a ledger. A digital currency’s ledger records all transactions which took place on a certain block chain network.
Leverage:
Trading with borrowed capital (margin) in order to increase the potential return of an investment.
Liquidity:
The availability of an asset to be bought and sold easily, without affecting its market price.
of the coins.
Margin trading:
The trading of assets or securities bought with borrowed money.
Market cap/MCAP:
A short-term for Market Capitalization. Market Capitalization refers to the market value of a particular cryptocurrency. It is computed by multiplying the Price of an individual unit of coins by the total circulating supply.
Miner:
A computer participating in any cryptocurrency network performing proof of work. This is usually done to receive block rewards.
Mining:
The act of solving a complex math equation to validate a blockchain transaction using computer processing power and specialized hardware.
Mining contract:
A method of investing in bitcoin mining hardware, allowing anyone to rent out a pre-specified amount of hashing power, for an agreed amount of time. The mining service takes care of hardware maintenance, hosting and electricity costs, making it simpler for investors.
Mining rig:
A computer specially designed for mining cryptocurrencies.
Mooning:
A situation the price of a coin rapidly increases in value. Can also be used as: “I hope bitcoin goes to the moon”
Node:
Any computing device that connects to the blockchain network.
Open source:
The practice of sharing the source code for a piece of computer software, allowing it to be distributed and altered by anyone.
OTC:
Over the counter. Trading is done directly between parties.
P2P (Peer to Peer):
A type of network connection where participants interact directly with each other rather than through a centralized third party. The system allows the exchange of resources from A to B, without having to go through a separate server.
Paper wallet:
A form of “cold storage” where the private keys are printed onto a piece of paper and stored offline. Considered as one of the safest crypto wallets, the truth is that it majors in sweeping coins from your wallets.
Pre mining:
The mining of a cryptocurrency by its developers before it is released to the public.
Proof of stake (POS):
A consensus distribution algorithm which essentially rewards you based upon the amount of the coin that you own. In other words, more investment in the coin will leads to more gain when you mine with this protocol In Proof of Stake, the resource held by the “miner” is their stake in the currency.
PROOF OF WORK (POW) :
The competition of computers competing to solve a tough crypto math problem. The first computer that does this is allowed to create new blocks and record information.” The miner is then usually rewarded via transaction fees.
Protocol:
A standardized set of rules for formatting and processing data.
Public key / private key:
A cryptographic code that allows a user to receive cryptocurrencies into an account. The public key is made available to everyone via a publicly accessible directory, and the private key remains confidential to its respective owner. Because the key pair is mathematically related, whatever is encrypted with a public key may only be decrypted by its corresponding private key.
Pump and dump:
Massive buying and selling activity of cryptocurrencies (sometimes organized and to one’s benefit) which essentially result in a phenomenon where the significant surge in the value of coin followed by a huge crash take place in a short time frame.
Recovery phrase:
A set of phrases you are given whereby you can regain or access your wallet should you lose the private key to your wallets — paper, mobile, desktop, and hardware wallet. These phrases are some random 12–24 words. A recovery Phrase can also be called as Recovery seed, Seed Key, Recovery Key, or Seed Phrase.
REKT:
Referring to the word “wrecked”. It defines a situation whereby an investor or trader who has been ruined utterly following the massive losses suffered in crypto industry.
Ripple:
An alternative payment network to Bitcoin based on similar cryptography. The ripple network uses XRP as currency and is capable of sending any asset type.
ROI:
Return on investment.
Safu:
A crypto term for safe popularized by the Bizonnaci YouTube channel after the CEO of Binance tweeted
“Funds are safe."
“the exchage I use got hacked!”“Oh no, are your funds safu?”
“My coins better be safu!”


Sats/Satoshi:
The smallest fraction of a bitcoin is called a “satoshi” or “sat”. It represents one hundred-millionth of a bitcoin and is named after Satoshi Nakamoto.
Satoshi Nakamoto:
This was the pseudonym for the mysterious creator of Bitcoin.
Scalability:
The ability of a cryptocurrency to contain the massive use of its Blockchain.
Sharding:
A scaling solution for the Blockchain. It is generally a method that allows nodes to have partial copies of the complete blockchain in order to increase overall network performance and consensus speeds.
Shitcoin:
Coin with little potential or future prospects.
Shill:
Spreading buzz by heavily promoting a particular coin in the community to create awareness.
Short position:
Selling of a specific cryptocurrency with an expectation that it will drop in value.
Silk road:
The online marketplace where drugs and other illicit items were traded for Bitcoin. This marketplace is using accessed through “TOR”, and VPNs. In October 2013, a Silk Road was shut down in by the FBI.
Smart Contract:
Certain computational benchmarks or barriers that have to be met in turn for money or data to be deposited or even be used to verify things such as land rights.
Software Wallet:
A crypto wallet that exists purely as software files on a computer. Usually, software wallets can be generated for free from a variety of sources.
Solidity:
A contract-oriented coding language for implementing smart contracts on Ethereum. Its syntax is similar to that of JavaScript.
Stable coin:
A cryptocoin with an extremely low volatility that can be used to trade against the overall market.
Staking:
Staking is the process of actively participating in transaction validation (similar to mining) on a proof-of-stake (PoS) blockchain. On these blockchains, anyone with a minimum-required balance of a specific cryptocurrency can validate transactions and earn Staking rewards.
Surge:
When a crypto currency appreciates or goes up in price.
Tank:
The opposite of mooning. When a coin tanks it can also be described as crashing.
Tendies
For traders , the chief prize is “tendies” (chicken tenders, the treat an overgrown man-child receives for being a “Good Boy”) .
Token:
A unit of value that represents a digital asset built on a blockchain system. A token is usually considered as a “coin” of a cryptocurrency, but it really has a wider functionality.
TOR: “The Onion Router” is a free web browser designed to protect users’ anonymity and resist censorship. Tor is usually used surfing the web anonymously and access sites on the “Darkweb”.
Transaction fee:
An amount of money users are charged from their transaction when sending cryptocurrencies.
Volatility:
A measure of fluctuations in the price of a financial instrument over time. High volatility in bitcoin is seen as risky since its shifting value discourages people from spending or accepting it.
Wallet:
A file that stores all your private keys and communicates with the blockchain to perform transactions. It allows you to send and receive bitcoins securely as well as view your balance and transaction history.
Whale:
An investor that holds a tremendous amount of cryptocurrency. Their extraordinary large holdings allow them to control prices and manipulate the market.
Whitepaper:

A comprehensive report or guide made to understand an issue or help decision making. It is also seen as a technical write up that most cryptocurrencies provide to take a deep look into the structure and plan of the cryptocurrency/Blockchain project. Satoshi Nakamoto was the first to release a whitepaper on Bitcoin, titled “Bitcoin: A Peer-to-Peer Electronic Cash System” in late 2008.
And with that I finally complete my odyssey. I sincerely hope that this helped you and if you are new, I welcome you to crypto. If you read all of that I hope it increased, you in knowledge.
my final definition:
Crypto-Family:
A collection of all the HODLers and crypto fanatics. A place where all people alike unite over a love for crypto.
We are all in this together as we pioneer the new world that is crypto currency. I wish you a great day and Happy HODLing.
-u/flacciduck
feel free to comment words or terms that you feel should be included or about any errors I made.
Edit1:some fixes were made and added words.
submitted by flacciduck to CryptoCurrency [link] [comments]

Technical: Taproot: Why Activate?

This is a follow-up on https://old.reddit.com/Bitcoin/comments/hqzp14/technical_the_path_to_taproot_activation/
Taproot! Everybody wants it!! But... you might ask yourself: sure, everybody else wants it, but why would I, sovereign Bitcoin HODLer, want it? Surely I can be better than everybody else because I swapped XXX fiat for Bitcoin unlike all those nocoiners?
And it is important for you to know the reasons why you, o sovereign Bitcoiner, would want Taproot activated. After all, your nodes (or the nodes your wallets use, which if you are SPV, you hopefully can pester to your wallet vendoimplementor about) need to be upgraded in order for Taproot activation to actually succeed instead of becoming a hot sticky mess.
First, let's consider some principles of Bitcoin.
I'm sure most of us here would agree that the above are very important principles of Bitcoin and that these are principles we would not be willing to remove. If anything, we would want those principles strengthened (especially the last one, financial privacy, which current Bitcoin is only sporadically strong with: you can get privacy, it just requires effort to do so).
So, how does Taproot affect those principles?

Taproot and Your /Coins

Most HODLers probably HODL their coins in singlesig addresses. Sadly, switching to Taproot would do very little for you (it gives a mild discount at spend time, at the cost of a mild increase in fee at receive time (paid by whoever sends to you, so if it's a self-send from a P2PKH or bech32 address, you pay for this); mostly a wash).
(technical details: a Taproot output is 1 version byte + 32 byte public key, while a P2WPKH (bech32 singlesig) output is 1 version byte + 20 byte public key hash, so the Taproot output spends 12 bytes more; spending from a P2WPKH requires revealing a 32-byte public key later, which is not needed with Taproot, and Taproot signatures are about 9 bytes smaller than P2WPKH signatures, but the 32 bytes plus 9 bytes is divided by 4 because of the witness discount, so it saves about 11 bytes; mostly a wash, it increases blockweight by about 1 virtual byte, 4 weight for each Taproot-output-input, compared to P2WPKH-output-input).
However, as your HODLings grow in value, you might start wondering if multisignature k-of-n setups might be better for the security of your savings. And it is in multisignature that Taproot starts to give benefits!
Taproot switches to using Schnorr signing scheme. Schnorr makes key aggregation -- constructing a single public key from multiple public keys -- almost as trivial as adding numbers together. "Almost" because it involves some fairly advanced math instead of simple boring number adding, but hey when was the last time you added up your grocery list prices by hand huh?
With current P2SH and P2WSH multisignature schemes, if you have a 2-of-3 setup, then to spend, you need to provide two different signatures from two different public keys. With Taproot, you can create, using special moon math, a single public key that represents your 2-of-3 setup. Then you just put two of your devices together, have them communicate to each other (this can be done airgapped, in theory, by sending QR codes: the software to do this is not even being built yet, but that's because Taproot hasn't activated yet!), and they will make a single signature to authorize any spend from your 2-of-3 address. That's 73 witness bytes -- 18.25 virtual bytes -- of signatures you save!
And if you decide that your current setup with 1-of-1 P2PKH / P2WPKH addresses is just fine as-is: well, that's the whole point of a softfork: backwards-compatibility; you can receive from Taproot users just fine, and once your wallet is updated for Taproot-sending support, you can send to Taproot users just fine as well!
(P2WPKH and P2WSH -- SegWit v0 -- addresses start with bc1q; Taproot -- SegWit v1 --- addresses start with bc1p, in case you wanted to know the difference; in bech32 q is 0, p is 1)
Now how about HODLers who keep all, or some, of their coins on custodial services? Well, any custodial service worth its salt would be doing at least 2-of-3, or probably something even bigger, like 11-of-15. So your custodial service, if it switched to using Taproot internally, could save a lot more (imagine an 11-of-15 getting reduced from 11 signatures to just 1!), which --- we can only hope! --- should translate to lower fees and better customer service from your custodial service!
So I think we can say, very accurately, that the Bitcoin principle --- that YOU are in control of your money --- can only be helped by Taproot (if you are doing multisignature), and, because P2PKH and P2WPKH remain validly-usable addresses in a Taproot future, will not be harmed by Taproot. Its benefit to this principle might be small (it mostly only benefits multisignature users) but since it has no drawbacks with this (i.e. singlesig users can continue to use P2WPKH and P2PKH still) this is still a nice, tidy win!
(even singlesig users get a minor benefit, in that multisig users will now reduce their blockchain space footprint, so that fees can be kept low for everybody; so for example even if you have your single set of private keys engraved on titanium plates sealed in an airtight box stored in a safe buried in a desert protected by angry nomads riding giant sandworms because you're the frickin' Kwisatz Haderach, you still gain some benefit from Taproot)
And here's the important part: if P2PKH/P2WPKH is working perfectly fine with you and you decide to never use Taproot yourself, Taproot will not affect you detrimentally. First do no harm!

Taproot and Your Contracts

No one is an island, no one lives alone. Give and you shall receive. You know: by trading with other people, you can gain expertise in some obscure little necessity of the world (and greatly increase your productivity in that little field), and then trade the products of your expertise for necessities other people have created, all of you thereby gaining gains from trade.
So, contracts, which are basically enforceable agreements that facilitate trading with people who you do not personally know and therefore might not trust.
Let's start with a simple example. You want to buy some gewgaws from somebody. But you don't know them personally. The seller wants the money, you want their gewgaws, but because of the lack of trust (you don't know them!! what if they're scammers??) neither of you can benefit from gains from trade.
However, suppose both of you know of some entity that both of you trust. That entity can act as a trusted escrow. The entity provides you security: this enables the trade, allowing both of you to get gains from trade.
In Bitcoin-land, this can be implemented as a 2-of-3 multisignature. The three signatories in the multisgnature would be you, the gewgaw seller, and the escrow. You put the payment for the gewgaws into this 2-of-3 multisignature address.
Now, suppose it turns out neither of you are scammers (whaaaat!). You receive the gewgaws just fine and you're willing to pay up for them. Then you and the gewgaw seller just sign a transaction --- you and the gewgaw seller are 2, sufficient to trigger the 2-of-3 --- that spends from the 2-of-3 address to a singlesig the gewgaw seller wants (or whatever address the gewgaw seller wants).
But suppose some problem arises. The seller gave you gawgews instead of gewgaws. Or you decided to keep the gewgaws but not sign the transaction to release the funds to the seller. In either case, the escrow is notified, and if it can sign with you to refund the funds back to you (if the seller was a scammer) or it can sign with the seller to forward the funds to the seller (if you were a scammer).
Taproot helps with this: like mentioned above, it allows multisignature setups to produce only one signature, reducing blockchain space usage, and thus making contracts --- which require multiple people, by definition, you don't make contracts with yourself --- is made cheaper (which we hope enables more of these setups to happen for more gains from trade for everyone, also, moon and lambos).
(technology-wise, it's easier to make an n-of-n than a k-of-n, making a k-of-n would require a complex setup involving a long ritual with many communication rounds between the n participants, but an n-of-n can be done trivially with some moon math. You can, however, make what is effectively a 2-of-3 by using a three-branch SCRIPT: either 2-of-2 of you and seller, OR 2-of-2 of you and escrow, OR 2-of-2 of escrow and seller. Fortunately, Taproot adds a facility to embed a SCRIPT inside a public key, so you can have a 2-of-2 Taprooted address (between you and seller) with a SCRIPT branch that can instead be spent with 2-of-2 (you + escrow) OR 2-of-2 (seller + escrow), which implements the three-branched SCRIPT above. If neither of you are scammers (hopefully the common case) then you both sign using your keys and never have to contact the escrow, since you are just using the escrow public key without coordinating with them (because n-of-n is trivial but k-of-n requires setup with communication rounds), so in the "best case" where both of you are honest traders, you also get a privacy boost, in that the escrow never learns you have been trading on gewgaws, I mean ewww, gawgews are much better than gewgaws and therefore I now judge you for being a gewgaw enthusiast, you filthy gewgawer).

Taproot and Your Contracts, Part 2: Cryptographic Boogaloo

Now suppose you want to buy some data instead of things. For example, maybe you have some closed-source software in trial mode installed, and want to pay the developer for the full version. You want to pay for an activation code.
This can be done, today, by using an HTLC. The developer tells you the hash of the activation code. You pay to an HTLC, paying out to the developer if it reveals the preimage (the activation code), or refunding the money back to you after a pre-agreed timeout. If the developer claims the funds, it has to reveal the preimage, which is the activation code, and you can now activate your software. If the developer does not claim the funds by the timeout, you get refunded.
And you can do that, with HTLCs, today.
Of course, HTLCs do have problems:
Fortunately, with Schnorr (which is enabled by Taproot), we can now use the Scriptless Script constuction by Andrew Poelstra. This Scriptless Script allows a new construction, the PTLC or Pointlocked Timelocked Contract. Instead of hashes and preimages, just replace "hash" with "point" and "preimage" with "scalar".
Or as you might know them: "point" is really "public key" and "scalar" is really a "private key". What a PTLC does is that, given a particular public key, the pointlocked branch can be spent only if the spender reveals the private key of the given public key to you.
Another nice thing with PTLCs is that they are deniable. What appears onchain is just a single 2-of-2 signature between you and the developemanufacturer. It's like a magic trick. This signature has no special watermarks, it's a perfectly normal signature (the pledge). However, from this signature, plus some datta given to you by the developemanufacturer (known as the adaptor signature) you can derive the private key of a particular public key you both agree on (the turn). Anyone scraping the blockchain will just see signatures that look just like every other signature, and as long as nobody manages to hack you and get a copy of the adaptor signature or the private key, they cannot get the private key behind the public key (point) that the pointlocked branch needs (the prestige).
(Just to be clear, the public key you are getting the private key from, is distinct from the public key that the developemanufacturer will use for its funds. The activation key is different from the developer's onchain Bitcoin key, and it is the activation key whose private key you will be learning, not the developer's/manufacturer's onchain Bitcoin key).
So:
Taproot lets PTLCs exist onchain because they enable Schnorr, which is a requirement of PTLCs / Scriptless Script.
(technology-wise, take note that Scriptless Script works only for the "pointlocked" branch of the contract; you need normal Script, or a pre-signed nLockTimed transaction, for the "timelocked" branch. Since Taproot can embed a script, you can have the Taproot pubkey be a 2-of-2 to implement the Scriptless Script "pointlocked" branch, then have a hidden script that lets you recover the funds with an OP_CHECKLOCKTIMEVERIFY after the timeout if the seller does not claim the funds.)

Quantum Quibbles!

Now if you were really paying attention, you might have noticed this parenthetical:
(technical details: a Taproot output is 1 version byte + 32 byte public key, while a P2WPKH (bech32 singlesig) output is 1 version byte + 20 byte public key hash...)
So wait, Taproot uses raw 32-byte public keys, and not public key hashes? Isn't that more quantum-vulnerable??
Well, in theory yes. In practice, they probably are not.
It's not that hashes can be broken by quantum computes --- they're still not. Instead, you have to look at how you spend from a P2WPKH/P2PKH pay-to-public-key-hash.
When you spend from a P2PKH / P2WPKH, you have to reveal the public key. Then Bitcoin hashes it and checks if this matches with the public-key-hash, and only then actually validates the signature for that public key.
So an unconfirmed transaction, floating in the mempools of nodes globally, will show, in plain sight for everyone to see, your public key.
(public keys should be public, that's why they're called public keys, LOL)
And if quantum computers are fast enough to be of concern, then they are probably fast enough that, in the several minutes to several hours from broadcast to confirmation, they have already cracked the public key that is openly broadcast with your transaction. The owner of the quantum computer can now replace your unconfirmed transaction with one that pays the funds to itself. Even if you did not opt-in RBF, miners are still incentivized to support RBF on RBF-disabled transactions.
So the extra hash is not as significant a protection against quantum computers as you might think. Instead, the extra hash-and-compare needed is just extra validation effort.
Further, if you have ever, in the past, spent from the address, then there exists already a transaction indelibly stored on the blockchain, openly displaying the public key from which quantum computers can derive the private key. So those are still vulnerable to quantum computers.
For the most part, the cryptographers behind Taproot (and Bitcoin Core) are of the opinion that quantum computers capable of cracking Bitcoin pubkeys are unlikely to appear within a decade or two.
So:
For now, the homomorphic and linear properties of elliptic curve cryptography provide a lot of benefits --- particularly the linearity property is what enables Scriptless Script and simple multisignature (i.e. multisignatures that are just 1 signature onchain). So it might be a good idea to take advantage of them now while we are still fairly safe against quantum computers. It seems likely that quantum-safe signature schemes are nonlinear (thus losing these advantages).

Summary

I Wanna Be The Taprooter!

So, do you want to help activate Taproot? Here's what you, mister sovereign Bitcoin HODLer, can do!

But I Hate Taproot!!

That's fine!

Discussions About Taproot Activation

submitted by almkglor to Bitcoin [link] [comments]

We built an ad-free, scam-free, Bitcoin QR Code Generator. Help us stop the scam sites!

If you do a google search for "Bitcoin QR Code Generator", some of the top ranked sites are total scams! These sites defraud people by substituting your Bitcoin address, for the scammer's. This has stolen countless Bitcoins from people who trust Google's capacity to rank reliable and trustworthy sites. Unfortunately, whoever is running these scam sites seems to be quite adept at search engine optimization.
After nearly being scammed myself, a couple of friends and I set out to offer the Bitcoin community a no-nonsense QR-Code generator website. There are a few other sites that are not scams and offer some similar functionality, but they are all scattered with ads, cookies, obscure code, address validation errors, etc.
So we built https://qrcode4bitcoin.com/

It's a Bitcoin URI and custom QR-Code Generator, with a simple design (with simple code) to create a javascript client-side based QR-Code generator; for an ad-free, cookie-free, and scam-free service to the Bitcoin community.
But we need your help! In order to displace the Bitcoin QR-Code generator scam sites from Google's first page of results, we are requesting that individuals in the Bitcoin community, please support our effort by linking to our site.
Thank you in advance for your helping us create a more transparent and honest Bitcoin ecosystem.
submitted by sunsetreunion to Bitcoin [link] [comments]

Pretty sure I just got scammed using a QR generator

I entered a btc wallet into a QR generator so I could send from my phone - it was bitcoinqrcodegenerator (dot) win
When I put in my wallet, it generated a code for a different wallet. Of course I should have checked the address before confirming but I rushed it and fucked up.
I feel like the biggest dipshit of all time. Don't make the same mistake I did.
submitted by doughnutpotato to Bitcoin [link] [comments]

10-12 08:24 - 'Failing to add zpub key to watch only wallet' (self.Bitcoin) by /u/Immediate-Host removed from /r/Bitcoin within 672-682min

'''
UPDATE: This has been an issue with Sentinel, everything is working fine again!
u/SamouraiWallet u/SamouraiWalletDev u/yilmzfurkan
This had me panicking yesterday evening since Sentinel displayed my balance as 0. Copied my public keys all over the place to test it with other apps, please let us know in thus sub next time!
Used sentinel for over a month to monitor my balance using the master public key shown of my cold card in Electrum.
Worked fine but just today it failed to load my balance, and kept loading forever, so I reinstalled the app, opened my electrum wallet (skeleton wallet, generated on cold card)
and when I used the information option to display my master pub key it displayed my zpub key, I used the qr code option but sentinel fails to add it and the mobile electrum wallet won't let me use it as well...

Used it for a month just fine before.... Really worried now that something is wrong with my keys. What could be the issue, why does no wallet let me monitor my zpub key all of sudden?
Electrum is still showing my correct balance though....
'''
Failing to add zpub key to watch only wallet
Go1dfish undelete link
unreddit undelete link
Author: Immediate-Host
submitted by removalbot to removalbot [link] [comments]

Bitcoin ATMs or exchange?

Bitcoin ATMs or exchange?


BTM, allows you to cash out bitcoins and buy cryptocurrency. Most ATMs have purchase restrictions, and some even require mandatory verification (KYC).

BTM work

Bitcoin ATM acts as a physical way to exchange the cache for Bitcoin or vice versa. The device includes a scanner, a cash dispenser, and a computer for managing transactions. Digital money is withdrawn to a Bitcoin wallet or a paper wallet of a buyer, for this a special QR code is intended on a mobile device or on a paper wallet itself, generated during the operation and printed out in a separate check. This service is paid and additional commission is charged for it. Most ATMs only work on the purchase of crypto.
All ATMs have a common purchase process:
  • Verification phase (optional, may vary significantly depending on the type of ATM);
  • Obtaining a bitcoin address for making a deposit (it can be generated and printed / sent by e-mail, but it is better to have it with you before using the device);
  • Cash deposit to ATM;
  • Confirmation of the operation (Bitcoin sent to your address).
This process may vary for each ATM.

Commission

The average commission at most ATMs is about 9%. It is worth noting that, while abroad, the buyer may encounter an increased commission due to the exchange from the country’s currency to the dollar / euro, then to the local currency.

Advantages and disadvantages

Among the advantages of Bitcoin ATMs are the following:
  • simple use;
  • the opportunity to discover a completely new method of payment; speed of transactions.
However, BTM has a few more shortcomings, so the use of ATMs may not always be convenient for customers:
  1. High commission. The difference in fees is due to the need to maintain physical devices, and it is also possible to levy additional fees.
  2. The risk of ordinary wallets. These risks are associated with the insecurity of this method of withdrawing funds / buying Bitcoin, since you can lose access to the wallet simply by forgetting the mnemonic phrase. Weak tech support. Failure to contact specialists in case of problems will be very difficult.
  3. Physical accessibility. Since Bitcoin ATMs are an innovation, far from every city they are present. Often finding such an ATM nearby is simply not possible.
  4. Weak tech support. Failure to contact specialists in case of problems will be very difficult.
Often, the purchase and withdrawal of funds through exchanges is a priority option. The Bitniex exchange offers an incredibly simple, convenient and high-quality service, all you need to do is go through the easy registration process and start trading on the exchange now.
submitted by Bitniex to Bitniex [link] [comments]

The Different Types of Crypto Wallets

Cryptocurrency wallet is a set of private and public keys that validates the ownership of a digital asset (e.g. Bitcoin), and allows the wallet owner to send and receive digital assets or even store them. There are several types of wallets that can store your crypto holdings, some more secure than other, some are easily accessible and some are dedicated to certain assets. There are two types of wallets, Hot wallets and Cold wallets. The hot wallets are connected to the internet which makes transfers of coins and tokens faster and on hand, yet are more susceptible to viruses and hackers. The cold wallet refers to the cryptocurrency wallets that are offline. Generally cold storage is more secure, but are limited to a selection of coins and tokens you can store.
Software Wallets
Software wallets, as the name suggests, are downloaded and installed on desktops and laptops; they reside on a desktop which can only be accessed on that device where they are installed. They do provide a good level of security but many things could happen to your device, such as viruses or a hardware issue which could deny you access to the wallet, so its recommended to export your wallet private keys and store your login and password on a USB stick or on another device. You can re-install the software on a new device and use your login/password along with the exported private keys to access your funds. One of the most popular software wallets available for free is Exodus were you can store over a 100 cryptocurrency assets.
Paper Wallets
One of the first crypto wallets 1st used in the early 2010s which contains your wallet address, private keys and a QR code representing these keys, which eases the transfer and receiving of coins or tokens. Rather than typing each letter and number of the address which could be hectic, one can just scan the QR code and request or receive the asset. Paper wallets ensure security by preventing your private keys from being exposed online upon creation as its stored physically and not on a computer or online. Theoretically it is strong but physically it is weak, it’s great to have a free wallet that never exposes your private keys online at any point. A paper wallet is not made from a strong and durable material such as metal or plastic, paper can easily tear, burn, the print can fade away from sun exposer, it can get wet and even get lost. Therefore, many have considered this option of the past and are utilizing other safer options to store their cryptos. Here you can create your own paper wallet via the wallet generator.
Mobile/App Wallet
Mobile wallets are considered to be the most popular and commonly used type of wallets; they are apps installed on mobile devices and their main advantage is the swift accessibility to funds. Accessing a bunch of features such as sending, receiving, storing, spending. The user-friendly mobile wallet app like crypto.com has multiple services built-ins, you can do all the functions mentioned above, and you also have the option to stake your cryptos and earn profit, you can buy and trade cryptos to add to your existing portfolio at low fees and even request for a loan.
Many upcoming coins and tokens have used 3rd party wallets to store their coins or even have no supported wallets at the early stage which makes them fully dependent of exchanges to store their coins or tokens. Solid crypto projects typically build their own wallets at an early stage; during or post (ICO, IEO, public and private sale) when they distribute their coins/tokens to users. iOWNX is one of the projects that built a dedicated wallet where you can store both Ethereum and iOWN Tokens with several security measures to protect your assets. You can install the wallet app on both Apple and Android for free.
Hardware Wallet
Known as a “Cold Wallet” which is a physical device and considered to be the safest wallet. Hardware wallet securely stores your private and public keys and typically looks like a USB drive and is resistant to computer viruses. Long term crypto holders prefer a cold wallet as it remains offline most of the time. The wallets are made of metal and hard plastic with an input screen to insert your pin number and in case you lose the device, you can purchase another one and insert your 24-paraphrases known as seed key which was created on your previous device, and access your funds. There are several hardware wallets available in the market; the 2 most popular ones are the Nano Ledger that sell devices from $36 to $148 and the Trezor Wallet which goes for around the same price bracket.
Exchange Wallets
Exchange wallets access blockchain through a browser interface without having to download or install any software. The advantage of the exchange wallets is the ease of accessibility to funds if you are an active trader and require direct access to your funds to be able to trade, rather than transferring coins and tokens from a different wallet which could take some time and fees that disables you to instantly trade at a certain price. The downside of storing your cryptos on an exchange wallet is that some service providers hold and manage the wallet’s private keys on your behalf. Although this may sound more convenient for inexperienced users, it is surely not the best practice. When using cryptocurrency exchanges, you should consider that they provide a high security feature and protection tools such as device management, multi-factor authentication, anti-phishing code, and withdrawal address management. It is highly recommended to store the majority of your coins and tokens in a safer wallet and keep some on the exchange for trading purposes.
There are many types of wallets to choose from to securely store your cryptocurrencies, yet there is not a perfect wallet in existence. Your personal needs and requirements will ultimately guide you to the type of wallets that fits your need. If you are looking for a quick “send and receive” in a few taps then mobile app wallets could be an option. If you are more of a “hodler” and believe in long term store value then Hardware wallets could be the wallet for you. Presuming that you are a swing or an active crypto trader which requires your funds to be available on demand, then storing it on trading platforms and exchanges is convenient, as you can trade your coin or tokens for others and vice versa, instantly without the need to transfer, send and unlocking wallets to access your funds (which requires a bit of time and gas fees).
We hope that you found this guide helpful and that you will be able to find the right crypto wallet that fits your requirement. For more information, you can check out our video “Intro to Crypto Wallets“ which covers in details all types of wallets.
submitted by Iowntoken to u/Iowntoken [link] [comments]

[ Bitcoin ] Technical: Taproot: Why Activate?

Topic originally posted in Bitcoin by almkglor [link]
This is a follow-up on https://old.reddit.com/Bitcoin/comments/hqzp14/technical_the_path_to_taproot_activation/
Taproot! Everybody wants it!! But... you might ask yourself: sure, everybody else wants it, but why would I, sovereign Bitcoin HODLer, want it? Surely I can be better than everybody else because I swapped XXX fiat for Bitcoin unlike all those nocoiners?
And it is important for you to know the reasons why you, o sovereign Bitcoiner, would want Taproot activated. After all, your nodes (or the nodes your wallets use, which if you are SPV, you hopefully can pester to your wallet vendoimplementor about) need to be upgraded in order for Taproot activation to actually succeed instead of becoming a hot sticky mess.
First, let's consider some principles of Bitcoin.
I'm sure most of us here would agree that the above are very important principles of Bitcoin and that these are principles we would not be willing to remove. If anything, we would want those principles strengthened (especially the last one, financial privacy, which current Bitcoin is only sporadically strong with: you can get privacy, it just requires effort to do so).
So, how does Taproot affect those principles?

Taproot and Your /Coins

Most HODLers probably HODL their coins in singlesig addresses. Sadly, switching to Taproot would do very little for you (it gives a mild discount at spend time, at the cost of a mild increase in fee at receive time (paid by whoever sends to you, so if it's a self-send from a P2PKH or bech32 address, you pay for this); mostly a wash).
(technical details: a Taproot output is 1 version byte + 32 byte public key, while a P2WPKH (bech32 singlesig) output is 1 version byte + 20 byte public key hash, so the Taproot output spends 12 bytes more; spending from a P2WPKH requires revealing a 32-byte public key later, which is not needed with Taproot, and Taproot signatures are about 9 bytes smaller than P2WPKH signatures, but the 32 bytes plus 9 bytes is divided by 4 because of the witness discount, so it saves about 11 bytes; mostly a wash, it increases blockweight by about 1 virtual byte, 4 weight for each Taproot-output-input, compared to P2WPKH-output-input).
However, as your HODLings grow in value, you might start wondering if multisignature k-of-n setups might be better for the security of your savings. And it is in multisignature that Taproot starts to give benefits!
Taproot switches to using Schnorr signing scheme. Schnorr makes key aggregation -- constructing a single public key from multiple public keys -- almost as trivial as adding numbers together. "Almost" because it involves some fairly advanced math instead of simple boring number adding, but hey when was the last time you added up your grocery list prices by hand huh?
With current P2SH and P2WSH multisignature schemes, if you have a 2-of-3 setup, then to spend, you need to provide two different signatures from two different public keys. With Taproot, you can create, using special moon math, a single public key that represents your 2-of-3 setup. Then you just put two of your devices together, have them communicate to each other (this can be done airgapped, in theory, by sending QR codes: the software to do this is not even being built yet, but that's because Taproot hasn't activated yet!), and they will make a single signature to authorize any spend from your 2-of-3 address. That's 73 witness bytes -- 18.25 virtual bytes -- of signatures you save!
And if you decide that your current setup with 1-of-1 P2PKH / P2WPKH addresses is just fine as-is: well, that's the whole point of a softfork: backwards-compatibility; you can receive from Taproot users just fine, and once your wallet is updated for Taproot-sending support, you can send to Taproot users just fine as well!
(P2WPKH and P2WSH -- SegWit v0 -- addresses start with bc1q; Taproot -- SegWit v1 --- addresses start with bc1p, in case you wanted to know the difference; in bech32 q is 0, p is 1)
Now how about HODLers who keep all, or some, of their coins on custodial services? Well, any custodial service worth its salt would be doing at least 2-of-3, or probably something even bigger, like 11-of-15. So your custodial service, if it switched to using Taproot internally, could save a lot more (imagine an 11-of-15 getting reduced from 11 signatures to just 1!), which --- we can only hope! --- should translate to lower fees and better customer service from your custodial service!
So I think we can say, very accurately, that the Bitcoin principle --- that YOU are in control of your money --- can only be helped by Taproot (if you are doing multisignature), and, because P2PKH and P2WPKH remain validly-usable addresses in a Taproot future, will not be harmed by Taproot. Its benefit to this principle might be small (it mostly only benefits multisignature users) but since it has no drawbacks with this (i.e. singlesig users can continue to use P2WPKH and P2PKH still) this is still a nice, tidy win!
(even singlesig users get a minor benefit, in that multisig users will now reduce their blockchain space footprint, so that fees can be kept low for everybody; so for example even if you have your single set of private keys engraved on titanium plates sealed in an airtight box stored in a safe buried in a desert protected by angry nomads riding giant sandworms because you're the frickin' Kwisatz Haderach, you still gain some benefit from Taproot)
And here's the important part: if P2PKH/P2WPKH is working perfectly fine with you and you decide to never use Taproot yourself, Taproot will not affect you detrimentally. First do no harm!

Taproot and Your Contracts

No one is an island, no one lives alone. Give and you shall receive. You know: by trading with other people, you can gain expertise in some obscure little necessity of the world (and greatly increase your productivity in that little field), and then trade the products of your expertise for necessities other people have created, all of you thereby gaining gains from trade.
So, contracts, which are basically enforceable agreements that facilitate trading with people who you do not personally know and therefore might not trust.
Let's start with a simple example. You want to buy some gewgaws from somebody. But you don't know them personally. The seller wants the money, you want their gewgaws, but because of the lack of trust (you don't know them!! what if they're scammers??) neither of you can benefit from gains from trade.
However, suppose both of you know of some entity that both of you trust. That entity can act as a trusted escrow. The entity provides you security: this enables the trade, allowing both of you to get gains from trade.
In Bitcoin-land, this can be implemented as a 2-of-3 multisignature. The three signatories in the multisgnature would be you, the gewgaw seller, and the escrow. You put the payment for the gewgaws into this 2-of-3 multisignature address.
Now, suppose it turns out neither of you are scammers (whaaaat!). You receive the gewgaws just fine and you're willing to pay up for them. Then you and the gewgaw seller just sign a transaction --- you and the gewgaw seller are 2, sufficient to trigger the 2-of-3 --- that spends from the 2-of-3 address to a singlesig the gewgaw seller wants (or whatever address the gewgaw seller wants).
But suppose some problem arises. The seller gave you gawgews instead of gewgaws. Or you decided to keep the gewgaws but not sign the transaction to release the funds to the seller. In either case, the escrow is notified, and if it can sign with you to refund the funds back to you (if the seller was a scammer) or it can sign with the seller to forward the funds to the seller (if you were a scammer).
Taproot helps with this: like mentioned above, it allows multisignature setups to produce only one signature, reducing blockchain space usage, and thus making contracts --- which require multiple people, by definition, you don't make contracts with yourself --- is made cheaper (which we hope enables more of these setups to happen for more gains from trade for everyone, also, moon and lambos).
(technology-wise, it's easier to make an n-of-n than a k-of-n, making a k-of-n would require a complex setup involving a long ritual with many communication rounds between the n participants, but an n-of-n can be done trivially with some moon math. You can, however, make what is effectively a 2-of-3 by using a three-branch SCRIPT: either 2-of-2 of you and seller, OR 2-of-2 of you and escrow, OR 2-of-2 of escrow and seller. Fortunately, Taproot adds a facility to embed a SCRIPT inside a public key, so you can have a 2-of-2 Taprooted address (between you and seller) with a SCRIPT branch that can instead be spent with 2-of-2 (you + escrow) OR 2-of-2 (seller + escrow), which implements the three-branched SCRIPT above. If neither of you are scammers (hopefully the common case) then you both sign using your keys and never have to contact the escrow, since you are just using the escrow public key without coordinating with them (because n-of-n is trivial but k-of-n requires setup with communication rounds), so in the "best case" where both of you are honest traders, you also get a privacy boost, in that the escrow never learns you have been trading on gewgaws, I mean ewww, gawgews are much better than gewgaws and therefore I now judge you for being a gewgaw enthusiast, you filthy gewgawer).

Taproot and Your Contracts, Part 2: Cryptographic Boogaloo

Now suppose you want to buy some data instead of things. For example, maybe you have some closed-source software in trial mode installed, and want to pay the developer for the full version. You want to pay for an activation code.
This can be done, today, by using an HTLC. The developer tells you the hash of the activation code. You pay to an HTLC, paying out to the developer if it reveals the preimage (the activation code), or refunding the money back to you after a pre-agreed timeout. If the developer claims the funds, it has to reveal the preimage, which is the activation code, and you can now activate your software. If the developer does not claim the funds by the timeout, you get refunded.
And you can do that, with HTLCs, today.
Of course, HTLCs do have problems:
Fortunately, with Schnorr (which is enabled by Taproot), we can now use the Scriptless Script constuction by Andrew Poelstra. This Scriptless Script allows a new construction, the PTLC or Pointlocked Timelocked Contract. Instead of hashes and preimages, just replace "hash" with "point" and "preimage" with "scalar".
Or as you might know them: "point" is really "public key" and "scalar" is really a "private key". What a PTLC does is that, given a particular public key, the pointlocked branch can be spent only if the spender reveals the private key of the given private key to you.
Another nice thing with PTLCs is that they are deniable. What appears onchain is just a single 2-of-2 signature between you and the developemanufacturer. It's like a magic trick. This signature has no special watermarks, it's a perfectly normal signature (the pledge). However, from this signature, plus some datta given to you by the developemanufacturer (known as the adaptor signature) you can derive the private key of a particular public key you both agree on (the turn). Anyone scraping the blockchain will just see signatures that look just like every other signature, and as long as nobody manages to hack you and get a copy of the adaptor signature or the private key, they cannot get the private key behind the public key (point) that the pointlocked branch needs (the prestige).
(Just to be clear, the public key you are getting the private key from, is distinct from the public key that the developemanufacturer will use for its funds. The activation key is different from the developer's onchain Bitcoin key, and it is the activation key whose private key you will be learning, not the developer's/manufacturer's onchain Bitcoin key).
So:
Taproot lets PTLCs exist onchain because they enable Schnorr, which is a requirement of PTLCs / Scriptless Script.
(technology-wise, take note that Scriptless Script works only for the "pointlocked" branch of the contract; you need normal Script, or a pre-signed nLockTimed transaction, for the "timelocked" branch. Since Taproot can embed a script, you can have the Taproot pubkey be a 2-of-2 to implement the Scriptless Script "pointlocked" branch, then have a hidden script that lets you recover the funds with an OP_CHECKLOCKTIMEVERIFY after the timeout if the seller does not claim the funds.)

Quantum Quibbles!

Now if you were really paying attention, you might have noticed this parenthetical:
(technical details: a Taproot output is 1 version byte + 32 byte public key, while a P2WPKH (bech32 singlesig) output is 1 version byte + 20 byte public key hash...)
So wait, Taproot uses raw 32-byte public keys, and not public key hashes? Isn't that more quantum-vulnerable??
Well, in theory yes. In practice, they probably are not.
It's not that hashes can be broken by quantum computes --- they're still not. Instead, you have to look at how you spend from a P2WPKH/P2PKH pay-to-public-key-hash.
When you spend from a P2PKH / P2WPKH, you have to reveal the public key. Then Bitcoin hashes it and checks if this matches with the public-key-hash, and only then actually validates the signature for that public key.
So an unconfirmed transaction, floating in the mempools of nodes globally, will show, in plain sight for everyone to see, your public key.
(public keys should be public, that's why they're called public keys, LOL)
And if quantum computers are fast enough to be of concern, then they are probably fast enough that, in the several minutes to several hours from broadcast to confirmation, they have already cracked the public key that is openly broadcast with your transaction. The owner of the quantum computer can now replace your unconfirmed transaction with one that pays the funds to itself. Even if you did not opt-in RBF, miners are still incentivized to support RBF on RBF-disabled transactions.
So the extra hash is not as significant a protection against quantum computers as you might think. Instead, the extra hash-and-compare needed is just extra validation effort.
Further, if you have ever, in the past, spent from the address, then there exists already a transaction indelibly stored on the blockchain, openly displaying the public key from which quantum computers can derive the private key. So those are still vulnerable to quantum computers.
For the most part, the cryptographers behind Taproot (and Bitcoin Core) are of the opinion that quantum computers capable of cracking Bitcoin pubkeys are unlikely to appear within a decade or two.
So:
For now, the homomorphic and linear properties of elliptic curve cryptography provide a lot of benefits --- particularly the linearity property is what enables Scriptless Script and simple multisignature (i.e. multisignatures that are just 1 signature onchain). So it might be a good idea to take advantage of them now while we are still fairly safe against quantum computers. It seems likely that quantum-safe signature schemes are nonlinear (thus losing these advantages).

Summary

I Wanna Be The Taprooter!

So, do you want to help activate Taproot? Here's what you, mister sovereign Bitcoin HODLer, can do!

But I Hate Taproot!!

That's fine!

Discussions About Taproot Activation

almkglor your post has been copied because one or more comments in this topic have been removed. This copy will preserve unmoderated topic. If you would like to opt-out, please send a message using [this link].
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submitted by anticensor_bot to u/anticensor_bot [link] [comments]

Bought two BC Vault metal wallets

Got two BC vault metal wallets with Crypto.com Pay with CRO. 20% off/cash back is awesome. I’ll be getting it shipped to USA within the next 1-2 weeks hopefully. After many hours of research and watching YouTube videos, Bc vault makes sense for large bitcoin long term holdings and my ledger nano X as a wallet for everything else. Even tho I can add other crypto on Bc vault, I decided it’s gonna be my vault for bitcoin and ethereum for long term like talking 10-20 years kinda thing. Got extra SD cards to make backups and waterproof otter box case for printed out QR code.
Canceled my NGRAVE zero indiegogo thing due to concerns about their “security” with giving you already populated private phrase keys compared to bc vault is randomly generated by shaking it. Not only that, it was also because you had to buy that ngrave metal private key plate separately and have to store that. If you lose one part of that metal plate you gotta buy a new one or if you lose the metal plate with the indentation then you’re SOL.
submitted by Captmedu74 to Crypto_com [link] [comments]

Bittrex Review: One of the First Crypto Exchanges Part 2

Bittrex Review: One of the First Crypto Exchanges Part 2

3. Fiat Currency Deposits, Trading, and Withdrawals

Bittrex Global supports euro trading, deposits, and withdrawals for eligible personal and corporate accounts. Please note that euro trading is offered by Bittrex Global and subject to the Bittrex Global Terms of Service.
There are three mechanisms available for depositing euros to your Bittrex Global account:
  • SEPA Credit Transfer
  • International Wire Transfer
  • Credit/debit card
Bittrex Global allows you to withdraw Euros to your bank account via either SEPA credit transfer or international wire transfer.
  • Minimum Deposit: 20 euros
  • Minimum Withdrawal: 10 euros
  • Minimum Deposit: 20 euros
No upper limits deposit or withdrawal for wire and SEPA transactions. Corporate account holders can withdraw up to 10,000,000 euros in one transaction after submitting an application to [[email protected]](mailto:[email protected])
If the name on your bank account is the same as the name in your Bittrex Global account, you can deposit euros by following the instructions on the SEPA deposit screen. You can get to this screen by going to your Holdings page, finding the EUR currency, clicking Deposit, and selecting SEPA.
https://preview.redd.it/ca7faux9ied51.jpg?width=974&format=pjpg&auto=webp&s=0993b8750b71e7467e15bb649f02c7c45f17f558
SEPA Transfer Instructions.
https://preview.redd.it/njwwpr8cied51.jpg?width=974&format=pjpg&auto=webp&s=8218dfcabf7e7f2e98f8db5e3e30f676baf10c6c
Recipient name: Bittrex International GmbHRecipient address: Äulestrasse 74 9490 Vaduz, LiechtensteinIBAN number: LI26 0881 1010 3179 K001 E
Make sure you accurately type the above text in SEPA transfer memo/notes to properly course the deposit for your account. If the name on your bank account differs from that in your Bittrex Global account, or if you wish to withdraw via SEPA without depositing, you will need to fill out the Euro Deposit and Withdrawal form https://bittrexglobal.zendesk.com/hc/en-us/requests/new?ticket_form_id=360000640760 to have your bank account whitelisted for use with your Bittrex Global account.
https://preview.redd.it/qk3k15snied51.jpg?width=974&format=pjpg&auto=webp&s=a641af8287d7624c9a68e69b5eede7a26dd00f65
https://preview.redd.it/stsxd6snied51.jpg?width=974&format=pjpg&auto=webp&s=b38ef3a190cfba71f041fb2a2947a27ba6931c38

Depositing USD on Bittrex

Crypto assets ensure that replenishment and all exchange transactions are kept through digital currency. Therefore, in case you need to withdraw cash, you must first convert it into Bitcoin (BTC).
At the same time, there may be some other ways to refill the balance with US dollars, which entails filling a particular form for depositing in dollars—Fiat USD trading Request.
To gain a digital currency on the exchange you need to visit your private account and find the Wallets section where all the wallets are shown.
The platform creates a crypto address to which we transfer funds. Money can be credited to the exchange within two days, with the time required depending on the currency and mode of payment (e.g. bank transfer, credit or debit card, and so on).
Therefore, after the transfer, the funds are credited to the exchange's internal wallet.
In order to include a user account for depositing and withdrawing funds in dollars, Bittrex must add the user’s bank account to the white list. Therefore, to replenish the balance with fiat money, you must fill a special form.
  1. Obtain approval for Fiat (USD) Trading, Deposits, and Withdrawals.
To do this, fill out and submit the form: https://bittrexglobal.zendesk.com/hc/en-us/requests/new?ticket_form_id=360000352300
https://preview.redd.it/jwcp2jguied51.jpg?width=861&format=pjpg&auto=webp&s=9ef519cbcf579cc3567e53b55af29fa154e342e3
Keep in mind that wire transfers can only be received from bank accounts approved through the fiat trading application.
2) Make sure your bank account has been whitelisted.
Sign in to your Bittrex Global account. Go to the Holdings Tab. Type “US Dollar” in the search bar. Click the Withdraw button beneath Actions. All available whitelisted (approved) bank accounts will be shown.
https://preview.redd.it/ldwmvt3wied51.jpg?width=974&format=pjpg&auto=webp&s=71d3da503e050f5b4d231184ea82f65fd477b671
3) Generate your USD deposit code.
To get a USD deposit code, click the Holdings tab. Type “US dollar” in the search bar, click Deposit beneath Actions. Your USD deposit code will appear at the bottom of your Wire Transfer Instructions. Copy this code and input it in the memo/notes subject of the wire transfer form to your financial institution.
https://preview.redd.it/pf7sowxxied51.jpg?width=974&format=pjpg&auto=webp&s=c99b3c10a1921254e8247c77a04f529bc60e290b
Use your USD deposit code every time making wire transfers. Wire transfers cannot be processed without a correct USD deposit code.
4) Best practice: Use the wire transfer information provided in your USD wallet when asking your bank for assistance.
Bittrex recommends that users resort to a local bank branch when sending wire transfers for the first time.
To show wire info, enter the "US dollar” in the search bar at the bottom of the Holdings page. Then click Deposit beneath Actions. You will see all the wire information. Use the deposit data to fill out a wire transfer form correctly. In case the info does not appear or if you have questions, please contact Bittrex Global support.
Make sure the wire transfer is not sent as an ACH transfer. ACH transfers aren't permitted so they will be banned.
Be aware: Wire deposits (wires sent to Bittrex Global) CANNOT be initiated on the Bittrex Global webpage. Only withdrawal wires can be initiated on the webpage. All wire transfers must be processed from the bank account number that was provided to Bittrex Global, in your fiat money transfer application.
5) Wait for the amount to be credited to your Bittrex Account.
All USD deposits are credited the same or next-business-day once settled in Bittrex's bank account.
Wires take 5-10 days to settle.
More delays will occur if the wire data does not fit the whitelist.
Wire transfer charges: Bittrex exchange does not take any wire transfer fee. Please ask your bank about the commission it charges for sending or getting a wire transfer. International banks usually involve mediators so check the commission the intermediary charges for their services.

Depositing Euros on Bittrex

There are three ways available for depositing Euros into Bittrex Global account:
  • SEPA Credit Transfer
  • International Wire Transfer
  • Credit/debit card
If you need to wire-transfer euros to a Bittrex Exchange Account, you will have to do the following:
  1. Obtain approval for EUR Deposits and Withdrawals.
To do this, fill out and submit the form: https://bittrexglobal.zendesk.com/hc/en-us/requests/new?ticket_form_id=360000640760
https://preview.redd.it/cq1fll73jed51.jpg?width=801&format=pjpg&auto=webp&s=b9b199d7bae9d9127b41cd72eec6619c05f2dcb3
  1. Make sure your bank account has been whitelisted.
Sign in to your Bittrex Global account. Go to the Holdings Tab. Type “EUR” in the search bar. Click the Withdraw button beneath Actions. All available whitelisted (approved) bank accounts will be shown.
https://preview.redd.it/26g4bz36jed51.jpg?width=974&format=pjpg&auto=webp&s=a2457611bdca65ad15320ceba583b51a797d357a
3) Go to the Holdings tab. Type “EUR” in the search bar. Click the Deposits button beneath Actions.
https://preview.redd.it/l0q8hkcajed51.jpg?width=974&format=pjpg&auto=webp&s=6d7bf1fd2cc0185c13ddc89f91c35061bf5249ef
Deposit SEPA Transfer.
https://preview.redd.it/5eb44h9djed51.jpg?width=974&format=pjpg&auto=webp&s=4c4433c87b633d8b69d5c26ef067a63129baf8fe
Make sure to include the text above in your SEPA switch memo/notes to perform a deposit to your account correctly.
No primary deposit is needed, but you need to provide details on the institution managing your account.
Attachment requirement: a bank-issued letter or account statement displaying containing the following data:
  1. Your name on your bank account.
  2. Your bank IBAN or account number.
  3. Your bank SWIFT/BIC code.
  4. Your bank name.
  5. Approval to deposit euros from and withdraw euros to your approved bank account.
  6. You can have multiple bank accounts approved.
  7. All banking details in the form (IBAN, Account, SWIFT/BIC, etc.).
  • Minimum Deposit: 20 euros
  • Minimum Withdrawal: 10 euros
  • No maximum deposit or withdrawal for wire and SEPA transfers
Corporate account holders can withdraw up to 10,000,000 euros in one transaction after submitting a request to [[email protected]](mailto:[email protected]).

Debit and Credit Card Transactions on Bittrex Global

To use a debit or credit card in your Bittrex Global Account do the following:
  • Click Holdings in the upper-right corner of the home page
  • Select Deposit via credit/debit card
  • Enter an amount to buy (weekly limit: $2,500/monthly limit: $7,500)
  • Click Enter card info next
  • Enter your credit card data
  • Carefully read the privacy policy and transfer terms
  • Click Pay
After the submission, you will be redirected to your bank’s 3DSecure portal (follow the prompts to confirm the transaction).
As soon as the transaction is permitted, the funds may be credited to your wallet. You can track the transfer progress in the Deposits section of the Holdings page.
  • Credit Cards Accepted: Visa
  • Processing Fee: 3%
  • Daily Limit: $2,500
  • Weekly Limit: $2,500
  • Monthly Limit: $7,500
  • Alternative Options to Fund your Wallet: USD Wire Transfers (No Deposit Limit)

Countries Supported

Andorra, Austria, Australia, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hong Kong, Hungary, Iceland, India, Indonesia, Ireland, Italy, Japan, Kosovo, Latvia, Liechtenstein, Lithuania, Luxembourg, Malaysia, Malta, Monaco, Montenegro, Netherlands, New Zealand, Norway, Philippines, Portugal, Reunion, San Marino, Singapore, Slovakia, Slovenia, South Korea, Sweden, Switzerland, Taiwan, United Kingdom, Vietnam.

Depositing Coins/Tokens on Bittrex Crypto Exchange

To deposit crypto coins to your Bittrex exchange account, you will need to take a few important steps. It's critical to be especially careful to make your deposit as secure as possible.
To deposit coins to Bittrex Global, do the following:
  1. Click Holdings in the upper-right corner of the home page.
https://preview.redd.it/7h6ihk2ijed51.jpg?width=974&format=pjpg&auto=webp&s=bc1dceb15f0a93bf1c555ed75032f9ec1792ac1b
2) Find for the wallet you want to deposit funds to and click Deposit beneath the Actions tab.
https://preview.redd.it/ujrsrpljjed51.jpg?width=974&format=pjpg&auto=webp&s=fb96e242ac86bcbce02923f34e6e36179308d895
3) Please copy your Wallet Address to make a deposit. In case you don’t have any Wallet Address, click Generate new wallet address.
Below is the option of creating a deposit address for Bitcoin (BTC).
https://preview.redd.it/pqpkfmbljed51.jpg?width=970&format=pjpg&auto=webp&s=a3af6d68c0698907ce338a7dea4bb7f58653f423
A few cash and tokens have a minimum deposit amount. For instance, your Ethereum deposit address must hold extra than 0.05 ETH before crediting to your account.
If you deposit less than 0.05 ETH, you may want to deposit some amount on the blockchain amounts to more than 0.05 ETH. In case you send a deposit smaller than the minimum, you will have to make another deposit to reach the minimum amount.
Please make sure that you transfer coins of the same type to the address. This means if you generated a BTC deal, you deposit BTC to it and no other coin. In case you deposit a different coin than that of the deal, you take a risk of losing all the concerned funds.

Depositing Tether (USDT) Stablecoin

Below is the option of creating a deposit address for Tether (USDT).
  1. Click Holdings in the upper-right corner of the home page.
Find Tether USDT, and click Deposit beneath the Actions tab.
https://preview.redd.it/kc61io6qjed51.jpg?width=974&format=pjpg&auto=webp&s=7baed4d68fbf51dacc4e667b04501868645d1d57
2) Please copy the USDTT Wallet Address to make a deposit. In case you don’t have any USDTT Wallet Address, click Generate new wallet address.
https://preview.redd.it/ugh3b54tjed51.jpg?width=974&format=pjpg&auto=webp&s=0e272a481854b32407a6611690c501370431f47c
https://preview.redd.it/ph20s84tjed51.jpg?width=360&format=pjpg&auto=webp&s=0e92999e9b85d4aa2d590db15e631690530f4825
3) Copy this crypto address and paste it to the Etherscan.io search bar.
Click Search.
You will see the contract info. Click to view a QR code.
A new window will appear, showing a QR code of your USDT wallet address. Be careful and check the correctness of your USDT transaction to your account on the Bittrex exchange.
https://preview.redd.it/g2ar653yjed51.jpg?width=974&format=pjpg&auto=webp&s=ddc947f57b616316bcb010f8aa1bb02ccdb22389
You can check any Tether USDT ERC20 token transaction on the Ethereum blockchain. When a transaction happens, you will see the transaction hash and balance.
https://preview.redd.it/y11afeyyjed51.jpg?width=974&format=pjpg&auto=webp&s=40d1682638c462f8cb3a06c8e0d04dc6a99eeb35
Once the transaction is confirmed on the blockchain, the Tether USDT will be credited to the balance sheet and you will find them in the Balances section.
Other USDT deposits can be found in the Deposit History section.
https://preview.redd.it/81j8rue1ked51.jpg?width=974&format=pjpg&auto=webp&s=d6683000c5d7ddffc124352a0be7590f43cad6d4
The full version
First part
submitted by mPrestige to revain_org [link] [comments]

What Is Defi?

Cryptocurrency’s promise is to make money and payments universally accessible– to anyone, no matter where they are in the world.
The Decentralized Finance (DeFi) or Open Finance movement takes that promise a step further. Imagine a global, open alternative to every financial service you use today — savings, loans, trading, insurance and more — accessible to anyone in the world with a smartphone and internet connection.
This is now possible on smart contract blockchains, like Ethereum. “Smart contracts” are programs running on the blockchain that can execute automatically when certain conditions are met. These smart contracts enable developers to build far more sophisticated functionality than simply sending and receiving cryptocurrency. These programs are what we now call decentralized apps, or dapps.
You can think of a dapp as an app that is built on decentralized technology, rather than being built and controlled by a single, centralized entity or company. (Get used to this word, dapp, you’ll be seeing it a lot from here on out.)
While some of these concepts might sound futuristic–automated loans negotiated directly between two strangers in different parts of the world, without a bank in the middle– many of these dapps are already live today. There are DeFi dapps that allow you to create stablecoins (cryptocurrency whose value is pegged to the US dollar), lend out money and earn interest on your crypto, take out a loan, exchange one asset for another, go long or short assets, and implement automated, advanced investment strategies.

What differentiates these DeFi dapps from their traditional bank or Wall Street counterparts?

At their core, the operations of these businesses are not managed by an institution and its employees — instead the rules are written in code (or smart contract, as mentioned above). Once the smart contract is deployed to the blockchain, DeFi dapps can run themselves with little to no human intervention (although in practice developers often do maintain the dapps with upgrades or bug fixes).
The code is transparent on the blockchain for anyone to audit. This builds a different kind of trust with users, because anyone has the opportunity to understand the contract’s functionality or find bugs. All transaction activity is also public for anyone to view. While this may raise privacy questions, transactions are pseudonymous by default, i.e. not tied directly to your real-life identity.
Dapps are designed to be global from day one — Whether you’re in Texas or Tanzania, you have access to the same DeFi services and networks. Of course, local regulations may apply but, technically speaking, most DeFi apps are available to anyone with an internet connection.
Permissionless” to create, “permissionless” to participate — anyone can create DeFi apps, and anyone can use them. Unlike finance today, there are no gatekeepers or accounts with lengthy forms. Users interact directly with the smart contracts from their crypto wallets.
Flexible user experience — don’t like the interface to a certain dapp? No problem — you can use a third party interface, or build your own. Smart contracts are like an open API that anyone can build an app for.
Interoperable — new DeFi applications can be built or composed by combining other DeFi products like Lego pieces — e.g. stablecoins, decentralized exchanges, and prediction markets can be combined to form entirely new products.
DeFi is now one of the fastest growing sectors in crypto. Industry observers measure traction with a unique new metric — “ETH locked in DeFi”. At the time of writing, users have deposited over $600 million worth of crypto into these smart contracts.
Intrigued? Let’s take a closer look at just a few of the popular DeFi dapps out there that you can try today. You’ll need a cryptocurrency wallet with a built-in dapp browser (like Coinbase Wallet) to connect to these dapps. You can also use most of these dapps on desktop by selecting the Coinbase Wallet option and scanning a QR code.
It’s still early days for dapps, so DeFi users should do their research on new products and services. Like any computer code, smart contracts can be vulnerable to both unintended programming mistakes and malicious hacks.

Stablecoin and Decentralized Reserve Bank: MakerDAO

Maker is a stablecoin project where each stablecoin (called DAI) is pegged to the US Dollar and is backed by collateral in the form of crypto. Stablecoins offer the programmability of crypto without the downside of volatility that you see with “traditional” cryptocurrencies like Bitcoin or Ethereum.
You can try creating your own DAI stablecoin on the Maker Oasis dapp. Maker is more than just a stablecoin project, though–it aspires to be a decentralized reserve bank. People who hold a separate but related token, MKR, can vote on important decisions like the Stability Fee (similar to how the Federal Reserve’s Federal Open Market Committee votes on the Fed Funds rate).
Another stablecoin with a different architecture is USD Coin (USDC), where every USDC token is backed by one US dollar held in an audited bank account.
Borrow and Lend: Compound
Compound is a blockchain-based borrowing and lending dapp — you can lend your crypto out and earn interest on it. Or maybe you need some money to pay the rent or buy groceries, but your funds are tied up in your crypto investments? You can deposit your crypto to the Compound smart contract as collateral, and borrow against it. The Compound contract automatically matches borrowers and lenders, and adjusts interest rates dynamically based on supply and demand.
Other popular borrow/lend dapps are Dharma and dYdX. Aggregators like LoanScan track borrow/lend interest rates across the various dapps, so you can shop around for the best rates.
Automated Token Exchange: Uniswap
Uniswap is a cryptocurrency exchange run entirely on smart contracts, letting you trade popular tokens directly from your wallet. This is different from an exchange like Coinbase, which stores your crypto for you and holds your private keys for safekeeping. Uniswap uses an innovative mechanism known as Automated Market Making to automatically settle trades near the market price. In addition to trading, any user can become a liquidity provider, by supplying crypto to the Uniswap contract and earning a share of the exchange fees. This is called “pooling”.
Other popular Decentralized Exchange platforms (DEXes) include 0x, AirSwap, Bancor, Kyber, IDEX, Paradex and Radar Relay. All have slightly different architectures.
Prediction Markets: Augur
Augur is a decentralized prediction market protocol. With Augur, you can vote on the outcome of events, except you put ‘skin in the game’ by attaching a value to your vote. Prediction market platforms like Augur and Guesser are nascent, but offer a view into a future where users can make better predictions by tapping into the wisdom of the crowd.
Synthetic Assets: Synthetix
Synthetix is a platform that lets users create and exchange synthetic versions of assets like gold, silver, cryptocurrencies and traditional currencies like the Euro. The synthetic assets are backed by excess collateral locked into the Synthetix contracts.
No-loss savings games: PoolTogether
The composability of DeFi lends itself to infinite new possibilities. PoolTogether is a no-loss game where participants deposit the DAI stablecoin into a common pot. At the end of each month, one lucky participant wins all the interest earned, and everyone gets their initial deposits back.

So what’s next for DeFi?

Money and finance have been around in one form or the other since the dawn of human civilization. Crypto is just the latest digital avatar. In upcoming years, we might see every financial service that we use in today’s fiat system being rebuilt for the crypto ecosystem. We’ve already seen asset issuance and exchange, borrowing, lending, custody, and derivatives built for crypto. What’s next?
The first generation of DeFi dapps rely heavily on collateral as a safeguard. That is, you need to already own crypto and provide it as collateral in order to borrow more crypto. More traditional unsecured borrowing and lending will need to rely on an identity system, so that borrowers can build up credit and increase their borrowing power, much like today’s SSN and FICO scores. Unlike today’s identity and credit systems however, a decentralized identity will have to be both universal and privacy-preserving.
We’re also seeing innovation in the insurance space. Many of today’s DeFi loans are overcollateralized (meaning that loans seem inherently safe because of the generous cushion of assets held in reserve). But the black swan for DeFi is smart contract vulnerabilities. If a hacker finds and exploits a bug in the open source code for a dapp, millions of dollars could be drained in an instant. Teams like Nexus Mutual are building decentralized insurance that would make users whole in the event of smart contract hacks.
Another trend we’re seeing is better user experience. The first generation of dapps was built by blockchain enthusiasts for blockchain enthusiasts. These dapps did a great job of demonstrating exciting new DeFi possibilities, but the usability left something to be desired. The latest iterations of DeFi apps are prioritizing design and ease of use in order to take open finance to a wider audience.
In the future, we expect that crypto wallets will be the portal to all your digital asset activity, just like an internet browser today is your portal to the world’s news and information. Imagine a dashboard that shows you not just what assets you own, but how much you have locked up in different open finance protocols–loans, pools, and insurance contracts.
Across the DeFi ecosystem, we’re also seeing a move towards decentralizing governance and decision-making. Despite the word “decentralized” in DeFi, many projects today have master keys for the developers to shut down or disable dapps. This was done to allow for easy upgrades and provide an emergency shutoff valve in case of buggy code. However, as the code becomes more battle-tested, we expect developers will give up these backdoor switches. The DeFi community is experimenting with ways to allow stakeholders to vote on decisions, including through the use of blockchain-based Decentralized Autonomous Organizations (DAOs).
Something magical is happening in the open financial system — crypto is bringing money online, and we’re seeing a quantum leap in what’s possible when it comes to the functionality of money. It’s a rare opportunity to see an entirely new industry blossom from scratch. The DeFi space will at first play catch up with today’s financial services industry. But over time, it’s hard to even fathom what innovations will come about when the power to build financial services is democratized to anyone who can write code.
submitted by jakkkmotivator to Latest_Defi_News [link] [comments]

Looking for an android app to accept multiple crypto currencies in a store

Looking for an android app to accept multiple crypto currencies in a store

https://preview.redd.it/pp695q8ervc51.png?width=253&format=png&auto=webp&s=45da8f887cf52637e4c443a6ef17a14de985e95c
I've been using one Merchant app that only accepts one currency, it worked fine till it moved to support BIP70 only payment. it works like this:
  • I store the address of the wallet in the app (no wallet)
  • I type the amount to be paid
  • QR code generated with BIP21
  • When the address receive the payment it gives me a notification

I wonder if there are a software that can show QR code for addresses of multiple currencies, monitor them and give the seller a notification when an amount have been received. I don't want to use 3rd party services like Bitpay or Coingate nor I want a server solution like BTCpay, I want to have the coins delivered to addresses I store in the app so cashier can have it at their register.

There is this application for Bitcoin as an example:
https://github.com/blockchain/Android-Merchant-App
And this one which is moved to support BIP70 and has a nicer look:
https://github.com/Bitcoin-com/Android-Merchant-App
submitted by Damascene_U to CryptoCurrency [link] [comments]

Person claiming to be a Shopify employer wants me to use Bitcoin to buy equipment. Is this a Scam?

Person claiming to be a Shopify employer wants me to use Bitcoin to buy equipment. Is this a Scam?
First, I received this text message:

https://preview.redd.it/n4ieashhvn651.png?width=1080&format=png&auto=webp&s=5849e6ce82bd56f282379d4a02dc8f6a9cb39e93
Then, I talked to Stacey Williams over Google Hangouts about working at Shopify. Everything started out okay, and she sent me a check of $2,450 to use on equipment.
That's when things became weird. She requested that I use the money to buy bitcoin first from some random street vendor, and then to use the bitcoin to buy the equipment. I politely suggested that this felt dubious and asked her for assurance of her authenticity. Was she actually a Shopify employer?
She immediately said that she was offended and started using high-pressure tactics on me, telling me to just go and get the bitcoin or else I wouldn't be hired. I repeatedly asked for assurance of authenticity, and she repeatedly ignored these requests and used high-pressure tactics to get me to buy the bitcoin.
These are the bitcoin-buying instructions she sent me:
  • Click “Buy Bitcoins”
  • Provide mobile number
  • Enter received validation code
  • Scan fingerprint
  • Select coin (this type of machine may support not only Bitcoin, but also Litecoin, Dogecoin, Blackcoin, XCurrency)SELECT BITCOIN
  • Choose to scan wallet (pre-defined) or generate new
  • Scan wallet QR code if chosen
  • Insert cash bills
  • Click send
  • Get printed receipt
I refused to go immediately buy bitcoin and am currently trying to contact Shopify (unsuccessfully) to ask about this strange hiring process, and for assurance of authenticity. She is now demanding that I return the $2,450, which I am definitely going to do.
So what's going on here? Is this a scam?
submitted by realreddituser666 to Scams [link] [comments]

How to use Bitcoin Core only?

I'm wondering how one would restore a wallet that was made from a BIP39 seed to a Bitcoin Core wallet? Bitcoin Core does not use BIP39. So I presume you'd have to provide it the master private key.. but what is that exactly? Because on Ian Coleman's BIP39 utility website.... it shows BIP32 Root Key, Account Extended Private Key, and BIP32 Extended Private key... they are all different... which one would work to use in Bitcoin Core?
How would one backup their Bitcoin Core wallet private key? Is there an applicable mnemonic? Or is it just the private key?
Does Core work with QR codes? (Reading and Generating?)
submitted by SatoshiThreepwoodMP to BitcoinBeginners [link] [comments]

One of The Easiest Ways to Get Bitcoin NOW! For Beginners.

Hi, Friends. Here is what I did to get bitcoin fast. *Please note this is not the most private way*. You may need a BTC to your currency converter for convenience.
Go to CashApp on your mobile device and purchase bitcoin after going through their initial verification process. Then, on your MAIN DEVICE download a light bitcoin wallet (good for beginners) and from the MD (main device) wallet hit Request Bitcoin (or whatever it is titled) to generate an address and/or a QR Code. From your phone, send bitcoin (whatever amount) and scan the QR Code or input the address from the MD Wallet. This will generate the amount you are trying to send.
Now, the transaction is going through the blockchain. You can check the transaction as it flows through the blockchain here: https://blockstream.info/. Usually a link will generate so you can check from the wallet. CashApp doesn't charge you anything to transfer to another wallet.
You should be alerted by CashApp when the transaction is confirmed through the blockchain.
Boom you have bitcoin in your MD Wallet.
Here you can check the charts: https://www.tradingview.com/symbols/BTCUSD/
submitted by jeremyhunt1995 to HowToBuyBitcoin [link] [comments]

How to Cold Store Your Cryptocurrency for Safekeeping

According to CipherTrace (which specializes in litigation tools and services for cryptographic markets), between 2018 and 2019, the amount of theft from cryptographic wallets exceeds $2 billion. Thefts and break-ins are caused by a variety of reasons: simple incompetence in cryptographic storage, as well as by companies that provide storage services. It is not unusual for holders of crypto currency to lose access to their wallets by themselves, one of the last known cases occurred in Ireland: ,57 million dollars couldn’t be confiscated from a detained drug dealer, which were stored in bitcoins. The problem was that the wallets keys were lost.
The most secure way is a cold storage — all account data and private keys are kept offline and all transactions are manual. This storage method is great because it is fully protected from hacking and interception of data, but it is not suitable for those who make daily transfers of cryptocurrency, it is simply inconvenient.
If you compare “cold and hot” wallets, you can give a simple example: A hot wallet can be compared to a wallet that can be lost and stolen. But you can always access your funds. A cold wallet is safe, and access to it is not permanent. You can also take or put money, but it will require a special code.
In this article we will tell you about the most popular types of cold wallets and we will analyze their pros and cons.

Types of cold wallets

All cold wallets have one common thing — the data is stored offline. However, there are several types of cold wallets, which differ in the degree of protection, physical embodiment and cost of the wallet.

Desktop wallet

Desktop wallets are also known for a high level of protection, in addition to the ability to store crypto currency offline. There are so-called “light” wallets weighing less than 1 gb, and “heavy” wallets weighing more than 1 gb. Two of the desktop wallets can be distinguished:

Exodus Wallet

Multicurrency wallet. It was created in 2016 and supports more than 100 crypto currencies, since 2019 has a phone application. The wallet allows you to export private keys that are created locally, and then to upload them back. Private keys can be discounted to removable media and downloaded only when the transaction is completed. If the user decides to leave private keys on the same computer where the wallet is located, keys are securely encrypted. In order to use your wallet ,there is no need to register or to download the entire blockchain — synchronization is taking place online. In addition to wallet services Exodus Wallet provides an integrated crypto-exchange. The installation file weighs 85 mb.

Bitcoin Core

Bitcoin Core is the official Bitcoin wallet. The size of the wallet is 160 gb, but according to the developers of the company, it’s better to give it a separate winchester with the size of 500 gb. From the security viewpoint, it’s suggested to install a security code or a seed phrase, which may consist 8 words. It is also suggested to copy wallet.dat file. — private wallet key, which will allow you to restore access to your funds.

Hardware wallets

Appears like a regular flash drive with an interface (screen, control keys). This wallet can safely store information about the balance and keys, full functionality is available only when connected to a computer, but the latest models have a special button that allows you to confirm the transaction without connecting to a PC. Each time the device offers to generate a new code-password to confirm the transaction, which significantly reduces the probability of hacking. After generating the code, you need to set a mnemonic phrase (seed) — it consists of 12 or 24 words, which are not related to each other in any way. Such type of wallets has a special protection system that allows you to connect even to potentially infected PCs. The wallets themselves won’t be affected by malware.
The obvious cons of hardware wallets are the following:
  1. It is also possible to lose a device that is so small in size.
  2. A physical device can easily fail due to a variety of damages.
  3. It is not recommended to buy such wallets from “hand”, even from friends, as they can be pre-installed with malware.
As you can see, storing crypto currency with a hardware wallets is very safe and secure, however you should take care about the device. Many people who hold a large amount of crypto currency, in order to not to lose a hardware wallet, store it in a safe deposit box, depriving someone of access to it.

Popular Hardware Wallets models

Trezor One

The first hardware wallet produced in 2013 by the Czech company Satoshi Labs. The device has an OLED display with a pin code, public addresses and Seed phrases. Trezor One has won recognition from users due to its multicurrency and affordable price ($65), it is also considered one of the most secure hardware wallets.
Ledger Nano S
The wallet was released in 2016 by the French company Ledger SAS. Distinctive feature from the other wallets, is the Secure Element controller, which meets banking standards and is certified CC EAL 5+. Also, in order to work with each crypto currency you need to install a special application for this currency on the device, it is not quite convenient, however more secure. The average price of the device is $85.
KeepKey
The purse was released in 2015 in the U.S.. Distinctive feature is OLED display — 256 by 64 pixels. Due to this, you can fully see both the address of the wallet, and the seed phrase. Also, the wallet has a built-in exchange service ShapeShift — an opportunity to exchange crypto currency without entering the exchange. The average price of the device is $50.
BitBox01
Ionos Schnelly’s wallet was invented in Switzerland. In size it’s almost the most compact among all representatives of the hardware wallets. A distinctive feature is the availability of a backup — the card can be multiplied and kept in several places, by analogy with the seed-phrase. In November 2020, support for these wallets will be discontinued, but all owners will be given a 30% discount on the new model. The average price of the device is $55.
CoolWalletS
Developed in Taiwan by CoolBitX, which has long been manufacturing components for Visa and MasterCard. As well as Ledger Nano S has a security standard CC EAL 5+. This wallet works only through smartphones, connecting to them through Bluetooch. The average price of the device is $100.

Paper Wallet

In the age of technological process, plain paper has become a rather reliable method for storing cryptocurrency. With the help of special services, such as bitaddress.org, you can generate public and private keys, then writing them down on paper. You can also print keys as a QR code. To accept transactions with such a wallet, you provide the sender with a public key. To access the funds, you need to find any online wallet that supports your crypto currency. Enter your private key into your online wallet, thus integrating your funds into the system. However, you should understand that after this procedure your wallet will become “hot”.
The best of this storage method — paper wallet is free, its safety depends only from you. When storing a paper wallet to protect it from the fire, water and aging. Also, do not tell other people about where your paper wallet is hidden.
The disadvantages of this storage:
  1. If your wallet is lost, it will be impossible to restore it.
  2. Exposed to a physical damage.
  3. After sending the transaction, you will have to create a new cold wallet.

Offline transaction signature

For this storage method, you will need two PCs. The essence is that the secret keys are never in contact with the Internet, but are stored digitally. Offline transaction method is suitable for people who do not make a daily transactions and have an access to two devices. The process is below:
  1. A hot wallet is installed on a PC with the Internet. The transaction is created without entering private keys and authorization.
  2. The file with transaction is copied and transferred to the second PC without Internet, where private keys are stored.
  3. The transaction is signed offline, copied and transferred back to the PC with the Internet.
In fact, you can do it with one PC and a USB drive. The USB drive will store private keys. Also, you can create a transaction without entering private keys and authorization, after disconnecting the Internet, connect the flash drive, sign the transaction, turn on the Internet. In this case, you should take care of the antivirus system.
The disadvantages of this method:
  1. Using two PCs or a USB drive involves a lot of actions, which is time consuming.
  2. You need to back up your keys in case your PC or flash drive fails.

Multi-signature wallet

This method implies the creation of a wallet, which can be only withdrawn on condition that the transaction is verified by a predetermined number of users. The maximum number of users who can hold private keys of the wallet- is 15. It is considered as one of the most reliable ways of storage, in fact private keys are not only stored offline, but also divided between different people. Often the wallet with multisignatures is used by large crypto-companies, whose management believes that individually employees can not spend the budget. Moreover, when creating this wallet, the number of required multisignatures is minimal. For example: if one of the six keys is lost, the remaining ones will be enough for the transaction.
The disadvantages of this storage:
  1. If most of the keys are lost, access to the funds cannot be restored.
  2. You will not be able to make transactions on your own without the participation of other key holders.

Private Key Fragmentation

The private wallet key consists of 64 symbols. The key is divided into several fragments. They don’t represent anything separately, but if you put all the fragments together, you can access the funds. The key fragments are similar to multisignatures, but in this case you don’t need a multisig-wallet, and the whole process can be done manually.
The disadvantages of this method:
  1. If one fragment is lost, access to funds will be lost.
  2. The maximum level of protection can only be reached when key fragments are distributed to different places, for example: bookshelf, safe deposit box, car. If you divide the key fragments and put them in different boxes — the required level of protection will not be achieved.
When writing down key fragments on paper, protect the key from fire, water and aging.

Conclusion

Digital currencies are not physically expressed and exist only in the digital code, so cold wallets that doesn’t have an access to the Internet, protect cryptocurrencies from the most important and common problem — hacker theft. However, holders of cold wallets need to understand that the safety of a private key depends only on them. There are different ways to store private keys outside the network, but each of them makes it difficult for the user to make transactions.
Hardware wallets that have been specifically designed for this purpose are considered to be the best option for storing cryptocurrencies. With their help it is possible both to store funds off the network and to make transactions easily, without risking the safety of a private key. If you use other cold wallets, it is recommended to combine them with hot wallets. Keep the required crypto currency for daily transfers on hot wallets, and keep all other crypto on cold wallets.
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YOUR CRYPTO BOSS
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Transferring cryptocurrency to a paper wallet

Transferring cryptocurrency to a paper wallet
I want to gift some cryptocurrency to a person that is not very tech savvy (neither am I, but learning). I want this to be a physical experience with a proper paper wallet. I looked into physical coins as well, but decided to use a paper wallet.
My idea is to print out a paper wallet (ie from bitaddress.org), load the wallet from my Coinbase account and then mail it (no email/no scan, actual proper mail). Obviously I would mail only the Bitcoin address QR code, and then send the private key QR code via email or whatsapp once i know they have received it. I would then keep a paper copy of both codes in case this person looses the codes.
Is this method reasonably safe process?
Also, when i try to paste the bitcoin address (associated with the QR code) in the 'recipient' section of my Coinbase account send function, it keeps telling me that address is invalid. what am i doing wrong?
Thanks!
SAMPLE of the paper wallet that i generated
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Bitcoin for beginners

How ironic that one day everyone began to hear that they were cryptocurrencies, but everything that referred to them was synonymous with Bitcoin everywhere they talk about it, the strange thing is that more than 10 have passed years since this project started and many continue with blindfolds, we have evolved, revolutionary things have come into our lives, the last decades have come technologies that have changed our paradigms, such as the internet and many more came one of them it's bitcoin.
Bitcoin arose from the need for a safe, transparent and reliable money. All this is described by Satoshi Nakamoto in his white paper https://www.bitcoin.org/bitcoin.pdf this is at the hand of all so that we can see and read it and know how its structure is shaped and the purpose it has as a currency. Its operation occurred on January 3, 2009, when the genesis block of the chain was published, which was the first block mined in the network, bitcoin turns out to be for the time a magnificent money for the environment that was growing and its use was not long in Expanding its adoption, Hal Finney was one of the first people to support and contribute with Bitcoin since it was part of one of the first nodes, bitcoin has a maximum number of bitcoins that can be created on the network which is 21 million BTC Being this way it solves the problem of inflation since it is a deflationary currency, this system means that no more can be generated and its value will rise more over time due to the supply and demand that there will be in the market.
Every time a transaction is made there will be a number of validators that work to verify that the network is correct, this is through the blockchain is the accounting book where all the transactions made from the genesis block are stored , it is public and we can all see how it works that they do not draw cards up their sleeves, these blocks are mined every 10 minutes with a size of 1 mb approximately 2048 transactions that were made and will be mined by a very important group called miners who solve a mathematical process called proof of work with this will be the final process for your BTC sent will already be in the hands of its recipient.
To make a transaction you only need the address to which you want to send BTC or the QR code to be faster and select the amount in your wallet, with this you will only have to pay a commission for the work carried out by the miners that can vary depending on the time with which you want your transaction to be verified or to be mined in the next block of the chain. Today Bitcoin is the most important currency in the entire market with a strong ecosystem and a very large community that grows more for the security it offers, its price when making this post reaches $ 9,342.58 and a market capitalization of 168,004,364,619, $ 45 with which it takes the number 1 spot on the coinmarketCap list.
original post.
Bitcoin para principiantes
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Our first generation hardware wallets were made of military-grade aerospace aluminum. We’ve stripped all that down to just focus on air-gapping your private keys.

Our first generation hardware wallets were made of military-grade aerospace aluminum. We’ve stripped all that down to just focus on air-gapping your private keys.

https://preview.redd.it/0rogeunfujv41.png?width=1024&format=png&auto=webp&s=8a2cf5eff6f30a36fd7e86e16331eb40b4072627
Hey bitcoin! I'm Lixin, longtime bitcoiner and creator of Cobo Vault.
I come from a background in the electronic hardware industry, and experienced one of my products being featured in Apple Stores around the world. Back in 2018 Cobo CEO Discus Fish, who also co-founded F2Pool, invited me to help build Cobo’s hardware product line. As we had strong ties to miners in China, we naturally designed the 1st gen with them in mind. In China, mining farms are nearly always built in very isolated places where there is very cheap wind or water electricity. When we built our 1st generation Cobo Vault hardware wallet, we needed to maximize the durability of the device in addition to its security. We used aerospace aluminum rather than plastic and made it completely IP68 waterproof, IK9 drop resistant, and military standard MIL-STD-810G durable for the mining industry.
Things changed last year when I went to Bitcoin 2019 and talked to lots of hodlers in the States. I found that 95% of them don’t care about durability. I asked them if they were afraid of their home being flooded or burned down in a fire. The answer is - yes, they are afraid of these things, but see them as very low possibilities. Even if something were to happen, they said they would just buy another HW wallet for 100 dollars. From these conversations, it became more and more clear we should design a product around a normal hodler’s needs.
Our 2nd gen product compromises on durability but doesn’t compromise on security.
Most hodlers share some needs with miners:
  1. Hodlers want a more air-gapped solution so we kept QR code data transmission between your hardware wallet and the companion app which is also auditable.
  2. A Secure Element is the strongest wall of protection from physical attacks. We are the first hardware wallet - also maybe the first electronic product with SE - to have open source SE firmware.
  3. A battery can be a significant weak point. The 2nd gen continues the legacy of detachable batteries to prevent corrosion damage and will also support AAA batteries in case your battery dies someday.
  4. The 2nd gen also keeps the 4-inch touchscreen so you don’t need to suffer from tiny buttons and little screens anymore. Human error is one of the biggest reasons people lose their assets.
  5. We kept other features like the self-destruct mechanism and Web Authentication, which prevent side-channel and supply chain attacks.
If you'd like to read more about these features, check out our blog posts.
Aside from the legacy of the 1st gen, our 2nd gen product will have:
  1. Open source hardware wallet application layer and Secure Element firmware code. With the open source firmware code, you can see: random number generation, master private key generation, key derivation, and the signing process all happen within the SE and your private keys never leave.
  2. At the Bitcoin 2019 conference half the hodlers I met told me they own multiple hardware wallets which they use on the go. We added a fingerprint sensor you can use to authorize transactions without typing in your password. No need to worry about surveillance cameras when using your hardware wallet in airports.
  3. We will also support PSBT (BIP174) to be compatible with third-party wallets like Electrum or Wasabi Wallet in case people have need of using Cobo Vault with their own node or coinjoin. Multisig between Cobo Vault and other wallets will be realized to prevent single point failure with any brand of hardware wallet.
  4. By sacrificing the durability, we successfully controlled the price under 100 USD for the basic version.
  5. BTC-only firmware version for people who want to minimize the codebase for less of an attack surface.
We truly appreciate the support from the community and are giving away free metal storage Cobo Tablets with every purchase of our 2nd gen for a week! Add a tablet to your cart and place your order before May 5th, 8 AM PST to claim your free metal storage. Find us on Twitter CryptoLixin and CoboVault - any suggestions or questions are welcome!
submitted by Bright_Charge to Bitcoin [link] [comments]

How to create a bitcoin QR code How To Access The Users Webcam To Scan Bitcoin QR Codes QR Bitcoin Code Generator 2020 FREE BITCOIN GENERATOR!! Bitcoin QR Code Scan Test - YouTube

Brainwallet Generator 2.0 now supports 35+ Cryptocurrency wallets. The original secure client-side Bitcoin paper wallet generator, trusted since 2011. Convert Bitcoin Wallet Address to QR Code. QR code (abbreviated from Quick Response code), is the trademark for a type of matrix barcode (or two-dimensional barcode).It was first designed in 1994 for the automotive industry in Japan.Also, a barcode is a machine-readable optical label that contains information about the item to which it is attached. With this free Bitcoin Generator you can generate as many free BTC as you want. The site isn't limited to users. And the BTC Hack System is suitable both for people who are newbies and the ones who are in the business longer. It's the simplest tool you can find in the whole Internet. We don't need your money for our services. You don't need to pay any fee and you don't need any crypto to start ... Online Bitcoin QR Code Generator with address, amount and redundancy. Free Bitcoin Generator - Generate BTC for Your Wallet Slide the desired amount of BTC and click on the 'Generate' button. NOTE: To learn how to use this tool and the benefits of it, click here. This website is encrypted and all your data is protected. Enter Your BTC Wallet Address. Value: BTC. Generate . About Free BTC Generator Free BTC Generator is an online software that allows the mining ...

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How to create a bitcoin QR code

bitgen fake bitcoin generator, bitcoin generator coinbase, bitcoin generator city, bitcoin qr code generator, cheap bitcoin generator, como funciona bitcoin generator, bitcoin generator december 2019, How to accept Bitcoin. No computers. Don't have to be an IT whiz. Just print out a piece of goshdarned paper. We used http://blockchain.info wallet in this v... How to [SEND/RECIEVE] "BITCOINS" using #BLOCKCHAIN Wallet APP in MOBILE-PHONES (#Subtitles) - Duration: 1:09. Android Tech & Entertainment 8,096 views In this tutorial I show how you can use the Instascan library to easily turn the webcam into a qr code scanner which would be useful for bitcoin addresses, private keys, paper wallets, etc. https ... This video shows you how to send digital currency using a QR code. This is a convenient way to pay using your Luno wallet, without the need to enter the reci...

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