Questions tagged [bitcoin]

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

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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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118 votes
11 answers
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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
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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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
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
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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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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
2 votes
2 answers
2k views

How to accept bitcoin and transfer tokens from smart contract to sender ethereum address

I have created sample tokens Smart Contract with the payable feature/constructor, if someone pay from their Ethereum address to Smart Contract will get instant token into their Ethereum address. But ...
Prabhat Sutar'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
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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
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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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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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
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
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3 votes
3 answers
3k views

I own Ether, should I also own Ether Classic (are they one in the same)?

I own Ether, should I also own Ether Classic (are they one in the same)? If I own 100 Ether and believe in the technology behind it, and have owned them for 6 months or so, do I need to purchase ...
brett's user avatar
  • 31
2 votes
1 answer
7k views

How to sell ETH for USD or EUR?

What is the process to get Dollar or Euro from Ether to my bank account? The easiest is to sell ETH into BTC on Poloniex, then I transfer my BTC to Kraken and on Kraken I sell BTC into Euro and the ...
rethsid's user avatar
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1 vote
1 answer
464 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 - ...
Aseem Upadhyay's user avatar
0 votes
1 answer
233 views

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 ...
Mohamed's user avatar
  • 491
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
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
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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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
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
1 answer
594 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
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
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
3 votes
1 answer
223 views

What (if anything) in Bitcoin is better than Ether in the application area of a payment system? [duplicate]

I know of course that there is much more about Ethereum being a smart contract platform. I only refer to the characteristics of a cryptocurrency. If Ether is used for plain payment purposes similar to ...
max's user avatar
  • 31
1 vote
2 answers
94 views

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 ...
Mayank_MP5's user avatar
1 vote
3 answers
1k views

Is it possible to send/receive Bitcoin using a smart contract?

My Question goes in the sense of what's possible in terms of creating a Dapp that allows to send/receive BitCoin just like it would any other given ERC20 Token. Is this possible to achieve for a Smart ...
jlstr's user avatar
  • 179
1 vote
2 answers
1k views

ICO: how to accept bitcoins, credit cards and fiat?

A customer wants to launch an ICO which should accept contributions in Ethers, Bitcoins, and fiat via credit cards and wire transfer. Anyone was able to solve this? I know that this isn't an Ethereum ...
Paul Exchange's user avatar
1 vote
1 answer
2k views

Ethereum Mining: Do miners get a fee AND create new ether as a reward? [duplicate]

So far what I get is that when I send ether or any contract via the ethereum network that I then have to pay for this transaction by paying gas (which again has a price in ether and so on). So miners ...
user3554669's user avatar
0 votes
1 answer
62 views

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’ ...
Heba Mohsen's user avatar
0 votes
2 answers
102 views

My question is about forks in general. If I have a portion of a coin do I get the exact portion of that new coin?

my question is about forks in general. If I have a portion of coins and it gets forked do I get the exact amount of the new forked coin?
Etherneum's user avatar