Questions tagged [bitcoin]

bitcoin is a digital asset and a payment system invented by satoshi nakamoto.

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Does Bitcoin fee depend on amount? [migrated]

Does Bitcoin fees depend on amount of bitcoin sent ? On what factors does bitcoin fees depends on?
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How does a miner know when to start mining. Given the miners are geographically dispersed, how all of them start mining together?

When the transactions are sent from A to B, it can reach a miner (M1) first and other miner (m2) later then does (M1) starts mining instantly? And how many transactions are required for a miner to ...
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How can i write my own bitcoin miner software/program? [migrated]

I want to produce satoshis from the computer's cpu or gpu, collect them in a pool and transfer them to the wallet I want. I've been searching for months, but I couldn't find a training set for what I ...
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What does 'blockchain blindness' in the ethereum whitepaper mean?

This is from the ethereum whitepaper. Blockchain-blindness - UTXO are blind to blockchain data such as the nonce and previous hash. This severely limits applications in gambling, and several other ...
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What is 'value blindness' in the ethereum whitepaper?

Vitalik wrote the following in the Ethereum white paper. Value-blindness - there is no way for a UTXO script to provide fine-grained control over the amount that can be withdrawn. For example, one ...
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What is NFT Mining?

I have encountered about NFT Mining at may places over the net, twitter. I know about mining Bitcoin, Ethereum works with Proof of Work algorithm and able to get exactly, what's going behind the stage ...
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When minting there is a box appearing called 'signature (bytes)' what do I enter here?

i tried to mint through contract(mint dutch auction) but there was a third box called signature. What should i enter there? this was the contract https://etherscan.io/address/...
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Why we can't build decentralized applications upon Bitcoin?

I have recently gotten into blockchain development and reading from different sources, watching videos I've incurred that we have been building major De-Fi projects, applications upon Ethereum, EVMs ...
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generate valid address for polkadot and bitcoin and other tokens using web3.js

using below code const Web3 = require('web3'); const apikey = "b1fdacbb-59ea-4598-96ed-......"; const network = 'testnet'; // Change to mainnet for production const chainId = 97;...
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Transactions that led to the discovery of TheDAO hacker

What are the transactions that led to the discovery of the apparent hacker of TheDAO? What are the primary transactions across the Ethereum, Bitcoin, and Grin blockchains?
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How to change BNB token payable to BTC for betting a BTC instead of BNB

Full source code:https://github.com/laronlineworld/prediction/blob/main/Prediction.sol This Prediction (of price feed from oracle) smart contract can bet a BNB, the problem is I want to change the BNB ...
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Some questions about BlockChain (ETH, BTC)

Guys i'm a super newbie in blockchain and similar stuff so I got even dummier questions that i'd like to have answers to. This is mainly connected with the Ethereum Network, but if your instances and ...
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Bitcoin address to private key, [closed]

I know its impossible to calculate a Bitcoin private key from address, but how far beck can you go with math, where math stops?
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Is MEV possible on bitcoin?

Miner Extractable Value (MEV) is a big topic in the life of ethereum users, and it creates an additional revenue source for the miners. Is MEV possible on the bitcoin blockchain as well? And if yes/no,...
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Why do small introduction Ethereum miners not exist, similar to Bitcoins Block Erupters?

I was introduced to Bitcoin and crypto with Block Eruptors which were little miners which would not realistically earn you anything but were a big hit, is there a technical reason Etherum miners only ...
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exchange gather all hd wallet adresses fund

every exchange has a HD wallet that stores the fund an assets of their clients but sometimes in order to keep peoples coins safe the exchanges have to move their assets to more secure wallet like ...
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When we say that a 51% control of total computation power could lead to a successful Sybil attack, do we refer to miners or nodes?

As per my understanding of the blockchain so far (Bitcoin and Ethereum) nodes and miners have different jobs to do in a blockchain network. Although the terms are extensively used interchangeably, ...
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Ethereum and Bitcoin

The fundamental reason that Ethereum and Bitcoin use different metrics to maintain the size of their blocks. Any help will be appreciated!
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Do any consumer/customer participate in ICO?

Many people buy tokens in ICO for selling them in a higher price in the future. Maybe we can call this type of participants the investors. But I am wondering how many consumers/customers who want to ...
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Unable to withdraw/send ETH from shapeshift app. Need advise on what to do, it pops up the message "Invalid BigNumber String Argument"

Having trouble sending out et here um from my shapeshift mobile app. Its over two weeks now but I'm still not able to send or withdraw my ethereum.
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What is the core difference between coin and token?

From googling some results, both are exchanges of value token is limited to the project ecosystem. coin is a general-purpose exchange of value. But I didn't get it Bitcoin is a Coin still we buy it ...
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A Complete Guide to Cryptocurrency Exchanges for Beginners? [closed]

So you have heard about cryptocurrencies, especially after the unbelievable market growth it caused worldwide in the last few years and was in news all the time. Whatever the coin may be, the first ...
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is it possible to sign bitcoin transaction on Ethereum smart contract?

I want to create cross chain transaction without centralise backend. if anyone transfer WBTC to smart contract with native bitcoin address, smart contract sign native BTC transaction and sent to ...
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Why can we trade tokens from foreign blockchains on DEX?

I am trying to understand the concept of crypto exchanges (AMM / DEX). On a DEX on Ethereum, how is it possible to trade tokens that are not native to Ethereum, such as Bitcoin? How does the DEX ...
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My ToastWallet account is hacked. What to do please? [closed]

My toast wallet was hacked. I had forgotten my passphrase. I need help desperately. I forgot my passphrase and noticed a few days ago over 25K xrp has been withdrawn in 5 transactions past, ...
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Why does Bitcoin need to change receiving address for privacy, but not Ethereum? [duplicate]

Exactly as it says in the title. Why is it that, for the sake of privacy, wallets change your Bitcoin receiving address for every transaction, but not for Ethereum. Do they just not care about ...
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Blockchain. Using sub-wallets through the main wallet without any restrictions or commissions

What I mean: Alleged example: I have a wallet "A". This is the main wallet. I want to creat 5 sub-wallets (in real case it will be more than 10.000 sub-wallets) from the main wallet - "...
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Why higher gpu clock resulted in lower hash rate?

I have a couple of question, if you'd be so kind to answer: I've been searching the internet for the relation between GPU core clock & memory clock and the hash rate that it can do. All ...
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Stack too deep, try removing local variables. _tOwned[sender] = _tOwned[sender].sub(tAmount); [duplicate]

I need help, i don't understand this Error... Code: function _transferFromExcluded(address sender, address recipient, uint256 tAmount, bool lottery, bool updateWinner) private { uint256 ...
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Is there a blockchain reddit alternative?

Is there a blockchain Reddit alternative? I know of Reddit alternatives like communities.win but it's not blockchain and one cannot create a new community on one's own.
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What's the difference between Binance ERC20 and Coinbase ERC20 ...?

As a newbie I made a mistake whilst transferring btc to from Binance and Coinbase. My mistake was I didn't check the receive address with Coinbase and it defaults to eth and I wanted to send btc to ...
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Is there a project that can swap ETH and BTC using atomic swaps without having to deal with wrapped tokens like WBTC?

Is there a project that lets one do an atomic swap from ETH to Bitcoin or Litecoin or Monero without having to deal with wrapped tokens like WBTC(wrapped btc)? Basically a cross chain swap, without ...
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Statelessness vs statefulness - what is the difference? Comparison Bitcoin's vs. Ethereum's states

I now read multiple times about bitcoin, that it is a stateless system and that because of that bitcoin simple-purpose computations or programs can be executed at anytime and independent from any data....
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Why ETH has value and what is the floor for it?

I've been happily on my journey down the crypto rabbit hole over the last few months of quarantine. I've personally bought into the narrative that Bitcoin excels as a digital store of value, and as ...
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Can i sell my testnet tokens

I have some testnet tokens Eth,btc,litecoin,I need to know how can I sell this can we swap this to mainnet any site to do this
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How can I transfer ERC20 Tokens to Bitcoin donor in ICO?

I developed ICO on solidity. As everyone knows smart contracts only accept ETH, but I've seen many ICOs which accept BTC and any other cryptocurrency as well. I want to know how can I handle it if ...
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How to validate a BTC transaction in an Ethereum smart contract?

Can an Ethereum smart contract use SPV to validate a BTC or BCH transaction? If so, are there any functioning libraries? What are the drawbacks or challenges when doing so?
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Using Chainlink External Adapters doesn't return anything

Trying to use this Bitcoin Adapter But having some issues specifically with the copyPath argument and the callback arguments. For one, I would like to retrieve multiple parts of the JSON that is ...
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Are the yields on Compound legit?

I have been reading recently about the DeFi space. I have noticed (admittedly, pretty late) quite a bit of buzz regarding WBTC and its applications in Ethereum. I have read about the Compound dapp and ...
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Deriving a Bitcoin Address from Ethereum Private Key

There have been many answers about how to derive an Ethereum Address from a Bitcoin private key, but a curious problem has led me to ask how one would do the reverse. I'm sure it's possible because ...
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Ethereum vs bitcoin technology [closed]

I have understood how bitcoin works (coinbase block, mining, links between transactions, hashrate, nounce, proof of work, ...) Now i want to understand how Ethereum works. Can we say it is the same ...
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What if difficulty exceeds the length of a fixed sha256 hash in proof of work?

Hello im a newbie in Blockchain, i got to know some basics, but im confused that what if the difficulty exceeds the length of a sha256 fixed length string example : The fixed length is here 64 (sha256)...
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Do we need to create raw transaction for every UTXO that we use during a transaction? [closed]

Let say I have 2 UTXOs, one has value = 0.0001 and another one has value = 0.00005. Now I want to send 0.00014. SO now I have to use both UTXO to perform transaction. So do I have to create 2 raw ...
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Different kind of Wallet/Addresses/Accounts

I have a few questions regarding crypto wallet accounts and currencies. Recently I came across https://www.bitaddress.org/. This website generates bitcoin wallets. Now, when I tried to verify that ...
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can sign derived wallet transactions with main's wallet private key of seed phrase?

I would like to sign a transaction from a wallet which is derived from a seed, and sign it, with it's parent first address and private key derived from the seed, can I sign any tx of any derived ...
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Like an ERC20 interface, do we have any interface or a smart contract that supports creating and transferring Ether on Ethereum?

To create a token on Ethereum, we use ERC20 token interface to design our token smart contract that captures functions required like mint(), tranfer(), balanceOf(), etc. Similarly, do we have any ...
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Does crypto coins are transferred same as tokens?

If I understood correctly, when I want send a token using wallet (e.g., ERC20 token), I will: create a transaction (using send button on my wallet interface) with "to" address containing token ...
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Where is the stake amount stored in Proof-of-Stake?

So in the PoS consensus algorithm, the nodes can lock their coins and the node with the highest coins has the highest probability of getting the chance for validating coins. I have two questions: 1) ...
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Transaction malleability

I read about transaction malleability and have some questions regarding that, please help: It states, for transaction malleability a person changes the signature such that the transaction remains ...
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Why does proof of work targeted zeros always comes at the start of hash? why is it not in the middle or the end of hash?

My question is why always targeted zeros come at the start of hash of the block? I have never seen more than 2 zeros in middle or somewhere else in the hash of mined block... What's the reason?.... ...
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