Questions tagged [bitcoin]

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

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118 votes
11 answers
84k views

How would I explain Ethereum to a non-technical friend?

I've recently attempted to explain Ethereum to several non-techy friends. My explanation usually involves starting with a comparison to Bitcoin, but this quickly becomes complicated as I then have ...
Richard Horrocks's user avatar
68 votes
6 answers
105k views

What number of confirmations is considered secure in Ethereum?

In Bitcoin, 6 confirmations are considered secure (very low probability of transaction/block reversal). What is the current number in Ethereum?
eth's user avatar
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58 votes
3 answers
21k views

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?
eth's user avatar
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56 votes
4 answers
19k views

Why don't Ethereum addresses have checksums?

A checksum, similar to its use in Bitcoin addresses, can primarily prevent mistyped or invalid addresses from being used, before a transaction with an invalid address is constructed. Why don't ...
eth's user avatar
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36 votes
6 answers
36k views

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 ...
Donavan Theodor's user avatar
35 votes
2 answers
48k views

How do Ethereum's transaction fees compare to Bitcoin?

Ethereum has faster transactions than the 10 minutes of standard bitcoin protocol. How do the transaction fees compare at the moment if you translate the price into a comparable currency like dollars ...
Christian's user avatar
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29 votes
7 answers
22k views

What are the differences between Bitcoin blockchain and Ethereum blockchain?

Ethereum has been debated in the bitcoin ecosystem and was criticized. In order to understand better both projects, what are the main differences between BTC and ETH regarding the blockchain ...
nelruk's user avatar
  • 555
28 votes
2 answers
10k views

Can I use the same private key for Ethereum and Bitcoin?

Both Bitcoin and Ethereum private keys are usually a 256-bit number, isn't it possible to use the same private key for both Bitcoin wallets and Ethereum accounts? For instance, the Bitcoin wiki states:...
q9f's user avatar
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21 votes
2 answers
8k views

Is it safe to reuse Ether addresses?

I believe it's viewed as unsafe in Bitcoin because of the way transactions are signed. Is this also true for Ether addresses?
clewisjr1's user avatar
  • 261
15 votes
2 answers
3k views

What the difference between Bitcoin and Ethereum private/public keys and address?

I am trying to find a library for creating Ethereum wallets in a web environment (PHP, JS). I found Keytheremjs lib, but if use it in a browser, this tool is very slow. But I found a lot of simple PHP ...
vellmur's user avatar
  • 265
14 votes
2 answers
4k views

Is it possible to send transactions to multiple recipients?

In other blockchain based platforms, it's possible to send transactions to multiple recipients. For instance, if I want to send 13 ETH to Alice and 7 ETH to Bob, Bitcoin has sendmany. Is it possible ...
q9f's user avatar
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10 votes
1 answer
2k views

What is the name of pool which keeps transactions in memory such as Bitcoin's mempool?

Do Ethereum clients have a memory pool which keeps transactions like Bitcoin's mempool? If so, what is the name for it in Ethereum?
Satoshi Nakanishi's user avatar
10 votes
1 answer
3k views

How do I compare the "scalability" capabilities between ethereum and bitcoin?

I'm trying to assess how they can be compared. Bitcoin can process 7 trans/sec, is there some equivalent on the Ethereum side? How should I think about this and what quantitative info should I use?
Mark J.'s user avatar
  • 361
9 votes
3 answers
2k views

Is there a point to hide Ethereum nodes with TOR?

From a privacy perspective, is there any point in trying to torify ethereum nodes? I know there's a script to do that in bitcoin, although doing so may ironically made the bitcoin node more ...
shiso's user avatar
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9 votes
2 answers
4k views

Does Ethereum have a payment URI like Bitcoin?

Does Ethereum offer a payment URI like Bitcoin does? I'd like a user to be able to click a link and have a wallet (Mist) open with a transaction to that address. Examples Just the address: bitcoin:...
Logan M.'s user avatar
9 votes
1 answer
1k views

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?
eth's user avatar
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9 votes
1 answer
2k views

ICO crypto-currencies accepted during the sale: ETH, BTC, or even fiat?

ICO contracts are meant to accept Ether as payin for the tokens sold, for example https://cartaxi.io/pre-ico or https://www.herocoin.io/ But there are a lot of ICOs running on Ethereum that accept ...
Juan Ignacio Pérez Sacristán's user avatar
8 votes
3 answers
5k views

Why are there no change addresses?

What's the concept behind ethereum transactions that allows them not to require change addresses? What's the underlying difference compared to - for example - bitcoin?
q9f's user avatar
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8 votes
3 answers
3k views

How can I accept Bitcoin payment in a smart contract? What would be the code for that?

I will create my personal token and I would like to be able to sell it for ETH and BTC. I know how to add the sell function for ETH, but how can I sell the tokens for BTC? The ETH sell function I ...
Virgil Fotachi's user avatar
8 votes
1 answer
197 views

How are the network shards allotted to miners?

Are they allotted randomly? And, is there an upper limit for the number of shards for a particular miner? Generally, it is 2-3, but is there a defined upper bound? And what is the process/process in ...
Dawny33's user avatar
  • 2,007
7 votes
1 answer
3k views

Bitcoin : Ethereum :: Raft : Paxo

When we look at the earlier attempts to solve consensus problem in distributed systems, we encounter Raft and Paxo, are they analogous to what we see while comparing the technology behind Bitcoin vs ...
Mayukh Mukhopadhyay's user avatar
7 votes
3 answers
343 views

Is it possible for Bitcoin to live on the Ethereum Blockchain?

It seems to me that once Casper is fully implemented, the best of both worlds would be for the valuable and scarce BTC token to live on the expedient, efficient Ethereum blockchain. But would this be ...
Donavan Theodor's user avatar
7 votes
1 answer
4k views

What advantages and disadvantages does Ethereum have over Bitcoin?

What advantages and disadvantages does Ethereum have over Bitcoin? What can you do with Ethereum that you simply cannot with Bitcoin? What price do you pay for these additional functionalities?
q9f's user avatar
  • 32.9k
7 votes
1 answer
574 views

How does the BTC Relay validate Bitcoin blocks?

How can the BTC Relay contract verify that relayers are providing valid blocks from the Bitcoin blockchain?
MaiaVictor's user avatar
  • 3,177
7 votes
1 answer
826 views

How to accept Bitcoin for Ether based Token ITS? Want to understand easiest way to handle

We are planning to launch Initial Token Sale for our amazing startup. We are planning to accept Ether and Bitcoin with Ethereum based smart contracts. So, we are just looking forward to have standard ...
Krunal Soni's user avatar
7 votes
1 answer
2k views

How does coinbase.com manage multiple addresses?

Coinbase generate a new btc or eth address after every deposit. But how does it send funds from these addresses to another address. In case of btc, a transaction can have multiple from addresses. But ...
Narayan Prusty's user avatar
6 votes
2 answers
1k views

Ethereum fork of OpenBazaar

Is anyone forking OpenBazaar for Ethereum? OpenBazaar is a Bitcoin marketplace, and the OpenBazaar developers have expressed no interest to integrate any currencies other than Bitcoin.
Randomblue's user avatar
  • 2,610
6 votes
1 answer
3k views

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 ...
Questioner's user avatar
  • 2,670
6 votes
2 answers
2k views

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.
Mikko Ohtamaa's user avatar
6 votes
1 answer
2k views

How to find the number of unconfirmed transactions?

Bitcoin has a mempool with unconfirmed transactions. Where can I find statistics on the size of Ethereum's mempool of unconfirmed transactions?
Randomblue's user avatar
  • 2,610
6 votes
2 answers
963 views

How are Tokens issued to Bitcoin investors for ICO based on Ethereum

I was looking to know how an Ether based ICO can Accept & Reward Tokens to its Bitcoin donors. I understand that ether can be tracked & reward can be issued to the Donor's ether address ...
Sam's user avatar
  • 213
5 votes
4 answers
20k views

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 ...
leonprou's user avatar
  • 429
5 votes
3 answers
434 views

How can I open an account with a bank in Ethers?

How can I open an account with a bank in Ethereum? Can I trade it? Which banks support cryptocurrencies? Thanks for the help!
Anna's user avatar
  • 51
5 votes
2 answers
4k views

Deriving Ethereum address from Bitcoin address

As far as I know Ethereum private keys are compatible with Bitcoin private keys, as described in Can I use the same private key for Ethereum and Bitcoin? . HOWEVER Can I derive an Ethereum public ...
Mikko Ohtamaa's user avatar
5 votes
3 answers
974 views

Can a smart contract code be used to generate a bitcoin public/private key pair address?

Seeing that a smart contract is just code. How would it be possible to make a smart contract generate a Bitcoin public/private key pair and send it to a user without anyone knowing the pair.
Patoshi パトシ's user avatar
5 votes
2 answers
456 views

Is there any Bitcoin-backed token?

Is it possible to trade BTC and other altcoins on Ethereum's blockchain? If so, how?
MaiaVictor's user avatar
  • 3,177
5 votes
1 answer
3k views

How anonymous are Ether transactions?

I read some sources that say transactions are anonymous, some that say they are semi-anonymous, and some that say they are not anonymous at all. In what ways are the transactions anonymous and in what ...
Donavan Theodor's user avatar
5 votes
2 answers
2k views

Check that the timestamp of the block is greater than that of the previous block and less than 2 hours into the future?

I am reading the White Paper of Ethereum. And at the Mining Section, I do not understand the this part "less than 2 hours into the future" of the following sentence: Check that the timestamp of the ...
fluency03's user avatar
  • 201
5 votes
1 answer
597 views

Verifying Bicoin signed message in Ethereum smart contract

I'd like to explore the option to verify the messages that have been signed in Bitcoin wallets in Ethereum smart contracts. Ethereum smart contract is given a list of Bitcoin addresses Ethereum smart ...
Mikko Ohtamaa's user avatar
5 votes
2 answers
899 views

Can an Ethereum contract autonomously and securely manage a bitcoin wallet

I'm wondering if it's possible to have an Ethereum token that is backed by pooled bitcoin (and therefore has 1:1 value parity with Bitcoin) in a trustless way. With tokens issued and destroyed as ...
Justin Maxwell's user avatar
5 votes
2 answers
2k views

Regtest mode on Ethereum

I'd like to use regtest mode on Ethereum. Does it exist? If so, how can I use it?
Toshi's user avatar
  • 2,357
5 votes
1 answer
1k views

How to replicate Bitcoin's OP_RETURN functionality on Ethereum?

I know Ethereum is more advanced, and allows for more interesting things than associating data to a transaction. But let's say I have a legacy system that uses Bitcoin's OP_RETURN. What options do I ...
Fernando Tiberti's user avatar
5 votes
2 answers
2k views

Convert a Bitcoin private key into an Ethereum address

I'm currently using the lightwallet.js for ethereum and it seems to only accept a mnemonic seed to generate an ethereum address. I want to be able to use my Bitcoin private key to generate an ethereum ...
Patoshi パトシ's user avatar
5 votes
2 answers
1k views

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 ...
Madhavan Malolan's user avatar
4 votes
2 answers
755 views

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 ...
AdaptiveAnalysis's user avatar
4 votes
3 answers
3k views

What is the purpose of Testnet?

I'm just getting into cryptocurrencies so forgive me if there are some basics I am missing out on. I have got a bitcoin account up and running and will soon be buying a few just to test things out, ...
James Mallett's user avatar
4 votes
1 answer
394 views

Will Bitcoin and Ethereum be linked/bridged?

Will Bitcoin be linked to Ethereum in the future? If so - how will it link, and when is this planned to happen?
tmit's user avatar
  • 137
4 votes
2 answers
332 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 ...
Gabriel Rebello's user avatar
4 votes
2 answers
194 views

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 ...
n0unc3's user avatar
  • 51
4 votes
1 answer
295 views

The third party api failure problem

I wanted to highlight a problem we all suffer from when using third party API's. Let's say you want to make an ethereum transaction. Normally the API will return a txid when the request is successful. ...
Ivan da Silveira's user avatar

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