Questions tagged [bitcoin]

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

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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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2answers
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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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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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1answer
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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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Can you mine Bitcoin on the Ethereum Virtual Machine?

Code can be written on a smart contract to be deployed to the network, where nodes do the computational work for a fee and a given gas work. I was wondering if it would be theorectically possible, to ...
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1answer
2k views

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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227 views

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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39 views

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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1answer
664 views

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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981 views

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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1answer
48 views

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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140 views

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
42 views

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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60 views

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
41 views

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
40 views

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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1answer
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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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1answer
29 views

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
37 views

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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1answer
110 views

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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1answer
48 views

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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137 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
35 views

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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4answers
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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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1answer
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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
324 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. ...