Questions tagged [bitcoin]

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

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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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What explains ETH appreciation spikes over Bitcoin? Historical price chart analysis

The green line in the chart above shows Ether appreciating heavily over Bitcoin from Feb to July 2017 from 0.03 to 0.14 ETH/BTC (288% appreciation over BTC). Is this some sort of mistake, equivalent ...
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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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1answer
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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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1answer
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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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1answer
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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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1answer
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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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1answer
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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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1answer
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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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How will transaction malleability affect next transaction?

I wanted to ask regarding transaction malleability that if transaction malleability is going to be done then it will affect another transaction because hash of the previous block would be changed ...
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1answer
58 views

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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1answer
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MITM attack in hosted wallets

i have a question: in the web wallets(hosted wallets)when user want to make a transaction and send the information to the wallet server , can a one change the information(man in the middle attack)?
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1answer
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Understanding Transaction in Bitcoin [closed]

I read a lecture about Bitcoin Blockchain. As shown in the slide below, a user Alice sends a transaction to BoB. Alice should 1-) Hash(Hash of the transaction of the coin || Bob Public Key || Alice ...
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2answers
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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 ...
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PIVX fork CryptoDezire Coin SendRawTransaction not working

A CDZC coin basically fork of PIVX . I am trying to send coin via rpc calls. Successfuly created RawTxn, SignRawTxn but unable to SendRawTxn. `await rpc.listunspent().then(async r => { ...
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How can I use bitcoin block stamp as seed for random number generation?

I am trying to create an ethereum based smart contract that shall generate random number. After searching around, I get to know that ethereum block stamp is vulnerable to miners hacks and false ...
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Is it legal create an algorithmic trading cryptocurrency fund for social groups around the globe to pool in their money?

Is it legal create an algorithmic trading cryptocurrency fund for social groups around the globe to pool in their money? What is the viability of this project in terms of regulatory compliance?
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Ethereum Blockchain Interoperability

I was reading through Vitalik's blockchain interoperability paper available here One thing he mentions is a company / project called EthereumLottery.io (currently not operating) which managed to ...
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How and Why other should buy and sell my ICO token? [closed]

When I invest or create a token, I am hoping someone in the future will want to buy it at a higher price. Why would anyone buy my tokens to use the platform if the price of the token keeps increasing ...
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Ethereum hd wallets making transactions like bitcoin wallets

I'm working on an exchange where every user has given a unique address, generated via ethereum hd wallets. How can i use a single master private key to transfer available funds from different ...
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1answer
135 views

solidity code warning in remix IDE

I am trying to create a smart contract using the but it is showing warning message in a string "Warning: Unused function parameter. Remove or comment out the variable name to silence this warning. ...
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2answers
178 views

What are differences between Bitcoin and Ethereum transactions?

I have read about how transactions work and how they can be redeemed in bitcoin. In a very abstract way, the sender defines the output script that should redeem the transaction. But I am new to ...
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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 ...
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Is the following scenario doable by a smart contract?

I have 2 persons ( say A or B). They want to have the following agreement. Person ‘A’ specify a deposit (x coins ) for user ‘B’ under a certain condition with a future time lock ‘t’. If user ‘B’ ...
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345 views

User ether.js mnemonic for bitcoin

I'm using Ether.js for my react native app to create mnemonic. i want use Wallet.fromMnemonic(code, path) to get key pairs but when i send bitcoin Derivation Path i get and ethereum private key which ...
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How feasible it to combine Proof of Work and Proof of Elapsed time consensus to create a custom blockchain?

I wonder if it feasible to create your own custom consensus by combining Proof of Work and Proof of Elapsed time? How would I approach it? Any tools or frameworks to build it? I appreciate all the ...
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135 views

timed commitment using ethereum blockchain

I read this paper: https://eprint.iacr.org/2013/784.pdf that introduces the idea of Bitcoin-based time commitment scheme. In which if the commiter does not open his commitment before a specific time ...
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Bitcoin generate Exe file using bitcoin-0.8.1 version [closed]

0.8.1 version and when i compile this version but successfully compiled but now i want to generate the window executable file(.exe) from bitcoin-0.8.1 version. so latest version and older bitcoin-0.8....
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If the hackers of the DAO converted the funds to bitcoin, would it have been possible to return the funds to the investors?

My understanding of the DAO hack is that Ethereum was hard forked so that those who lost funds could have them retrieved. If the hacked funds were immediately converted to bitcoin, would this still ...
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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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Implementation of privacy in blockchain

How can we see transactions in a particular block of Bitcoin, if they are encrypted and only Merkle root of transactions is stored on the blockchain. I think in that way we should be having an ...
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1answer
330 views

Are uncle blocks unnecessary overhead on blockchain?

I have been learning about ethereum but now am stuck with conflicting thoughts about block times and stale blocks. Here is what I understood, please correct me if I am wrong. Block time for 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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How can I implement ethereum If I'm making an exchange service like cex.io [closed]

I was wondering how cex.io manages ethereum service on their website. I know what happens with bitcoin. They have 1 wallet and daemon on their server for each coin. for example bitcoin. Then When I ...
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1answer
281 views

What is the “main” difference between consensus mechanism of Bitcoin and Ethereum?

Bitcoin and Ethereum both use proof-of-work (PoW) consensus mechanism. One of differences between Bitcoin Pow and Ethereum PoW is difficulty level, meaning that while in bitcoin block generation rate ...
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1answer
177 views

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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290 views

Slackness issue and time in smart contracts

At a high level, slackness issue says, it is not possible to guarantee that at any given point in time all honest miners see exactly the same blockchain length [1]. On the other hand, as we know the ...
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1answer
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Trustless Inter-chain transaction with Bitcoin- are there any flaws?

Let's say that Alice wants to send Bob 1 BTC, and in return Bob will send Alice 1 ETH. Alice's Bitcoin address is BTC_A, and Alice's Ethereum address is ETH_A. Likewise, Bob owns addresses BTC_B and ...
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What is 2^187 target in the Ethereum white paper wrt PoW in Bitcoin?

The paper says that The precise condition is that the double-SHA256 hash of every block, treated as a 256-bit number, must be less than a dynamically adjusted target, which as of the time of ...
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459 views

Is it possible to transfer Ether without a contract, like with Bitcoin?

I realised I don't know if Ethereum is exactly like bitcoin with an added dimension (smart contracts), or if there are things that Bitcoin can do "natively" that Ethereum can't. Is it possible to ...