Questions tagged [bitcoin]

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

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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 Value-blindness - there is no way for a UTXO script to provide fine-grained control over the amount that can be withdrawn.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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Is smart escrow with ERC20 tokens fit for below scenario?

I am planning for ICO, which provides services. User need to invest some x amount of money to buy token.After buying token their will be a grace period for 10 days to generate revenue and expect ...
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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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2 answers
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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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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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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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Why does a mining reward exist?

I understand that there needs to be an incentive for the nodes to be keeping the blockchain up and running by validating blocks, and mining rewards is that incentive. I fail to understand why does ...
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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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UTXO vs Account scalability paradigms and Merkle proof of ownership

From Ethereum's design rationale: Potential scalability paradigms: UTXOs are more theoretically compatible with certain kinds of scalability paradigms, as we can rely on only the owner of some coins ...
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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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1 answer
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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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timed commitment using ethereum blockchain

I read this paper: https://eprint.iacr.org/2013/784.pdf that introduces the idea of a Bitcoin-based time commitment scheme. In which if the committer does not open his commitment before a specific ...
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Which RX card for ETH mining?

i've seen that mining is getting more popular and i thought that i maybe should jump onto the train. So i've already got a 550W power supply from an older build, i can get a Asus P7P550 PRO ...
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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 ...
6 votes
2 answers
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Bitcoin price oracle

Are there any oracles available for Bitcoin price? I'd like to do a currency conversion math inside the smart contract code.
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3 answers
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Blochchain Smart Contract App

Actually Im working on a blockchain application based on smart contracts that allows to buy/sell properties and paying in cryptocurrency using Ethereum and Bitcoin. I wonder I develop smart contract ...
56 votes
4 answers
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What are the pros and cons of Ethereum balances vs. UTXOs?

Ethereum has a simpler model by not having UTXOs (Unspent Transaction Outputs) like Bitcoin. What does Ethereum "give up" by not having UTXOs, and what does it gain?
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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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How to swap BTC to WBTC

Wrapped Bitcoin (WBTC) is the first ERC20 token backed 1:1 with Bitcoin. So there must be a mechanism to lock BTC in the Bitcoin network and mint WBTC in Ethereum. I read about custodians and ...
3 votes
1 answer
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How to get live mempool transactions whitout full blokchain

I just want to analyse all mempool txs in realtime. I cant use an api because after several requests my ip gets blocked for some minutes, so I dont get the txs in this time. Thank you for help.
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see Ethereum USD value at time of transaction?

on Blockchain.info, when you hover over the value of a transaction, it will actually tell you the value of Bitcoin in USD at the time of that transaction (as well as how much that is worth now) is ...
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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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1 answer
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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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What are the critiques of Ethereum made by Bitcoin experts? And which ones do not apply to Bitcoin?

Ethereum has been discussed by Bitcoin experts, for example on IRC such as #bitcoin-wizards. What are the critiques of Ethereum made by Bitcoin experts? Which ones apply and do not apply to Bitcoin?
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Differences/similarities of "Bitcoin script" and "Ethereum smart contract"?

Can we compare Bitcoin script and Ethereum smart contract ? And if yes, What are differences/similarities of Bitcoin script and Ethereum smart contract in sense of functionality, architecture and ...
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Which payment API I can use to transfer Fiat money to my crypto exchange users ? ( At the time of withdrawl )

I am creating a Crypto exchange using Binance API/SDK , Users will register and deposit Fiat funds first into platform's paypal/stripe account using payment gateway. After deposit they can see virtual ...
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Are there any companies working on blockchain with clojure? [closed]

Are there any commercial FinTech companies or startups are working on blockchain technologies using the Clojure programming language?
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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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5 answers
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Can I download the whole blockchain from somewhere?

Bitcoin used to offer sharing/downloading a bootstrap.dat which contains the whole blockchain. Are there alternatives to getting it trickling through the peer-to-peer network? Can I just download it ...
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1 answer
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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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What is saved on every block on Ethereum?

In Bitcoin every block has the information about the transaction (A sends money to B, C to D etc). And everytime a new transaction (someone sends money to another address) is sent, the miners will ...
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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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1 answer
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Where, or how, can I programmatically get a complete history of the major cryptocurrencies?

I would like to programmatically get a complete list of the historical: Number of transactions Average Transaction Fee Hashrate Mining Profitability Difficulty Block Time Block Size related to the ...
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Several basic question about difference Bitcoin and Ether transactions

Sorry for the easy questions. I was developing tools for Bitcoin and now I want to try and use Ethereum instead. Raw transaction does not contain inputs and outputs, enough balance confirm outside ...
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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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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 ...