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Questions tagged [bitcoin]

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

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1answer
12 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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25 views

What is the Best Cryptocurrencies to Mine in 2019 ? Is it profitable [on hold]

I m new to Cryptocurrency but I am wondering to find Best Cryptocurrencies to Mine in 2019and tell me Is it profitable to invest in Cryptocurrency. Experts Tell me what will be the future of crypto as ...
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0answers
15 views

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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2answers
721 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 ...
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0answers
10 views

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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1answer
32 views

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
155 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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1answer
567 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 ...
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0answers
27 views

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
125 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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0answers
68 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 ...
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2answers
286 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
47 views

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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2answers
47 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 ...
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2answers
150 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 ...
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1answer
24 views

Is there any website for provide APIs for making transaction to different blockchain such as Ethereum, Litecoin, BTC, Neo etc

I want build a wallet which manages multiple coins and I'm looking for a website which provides APIs for transacting to different blockchains.
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0answers
25 views

How to fix gas limit issue when doing official Ethereum Tutorial?

I'm trying to work on this tutorial for past three hours and I just don't understand why are there so many holes to do it. https://ethereum.org/greeter It took me forever to figure out what it ...
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1answer
26 views

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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3answers
345 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 ...
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1answer
43 views

How can I withdraw the bitcoin out?

So I downloaded the Ethereum wallet and installed it. Once I launched it, it started to download the blocks, and I chose to connect with the mainnet. As indicated in the process, I may need to deposit ...
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1answer
92 views

How to find the largest Ethereum token holders on a given day? [duplicate]

Here is the Bitcoin Rich List. Is there something similar for Ethereum?
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1answer
246 views

Why is UTXO model better than Account model? [duplicate]

According to this I infer that UTXO is better (or at least more secure) than Account model. The reason why transactions work this way is because it’s an easier and more secure way of doing it from ...
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1answer
35 views

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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0answers
116 views

Ethereum Address using bitcoinJ

I am using BitcoinJ library in Android to generate HD wallet addresses for bitcoin and bitcoin-test networks. It is working, code: KeyChainGroup keyChainGroup = new KeyChainGroup(networkParameters)...
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2answers
109 views

Why is ethereum's mining function is safe as bitcoin's proof of work?

bitcoin's mining time is about 15 minutes while ethereum's mining time is 10 seconds. Is not it bad for ethereum's mining time to be too short? (from security aspect). Why is it so important for ...
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0answers
39 views

Where should I save bitcoin and fiat currency transactions record to validate when transferring tokens manually or after transferred?

In ICO, while accepting bitcoin or any fiat currency(USD/EURO), which is the best practice to store the transactions record for accepted bitcoins or fiat currency to validate later when transferring ...
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2answers
261 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 ...
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2answers
40 views

Block chain in Banking sector? [closed]

Does the concept of mining exist if an application is designed with a blockchain in the banking domain? From what I understand from mining with respect to Bitcoin, the miners keep on creating valid ...
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2answers
333 views

Do we have an API for airdrop

I am creating an news app which will show the ICO and Airdrop details. Is there is any API for Airdrop news ?
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0answers
24 views

I to want introduce myself to learn new and advanced technologies like AI, blockchain [closed]

I have completed 2days blockchain executive program two weeks back. Course covers high-level concept on blockchain, ethereum I have around 12+ yrs of IT experience and worked on different tools and ...
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1answer
156 views

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 ...
2
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1answer
198 views

Accepting bitcoin during crowdsale and making refund if soft cap not reached [closed]

I'm gonna make some api to allow my crowdsale to accept bitcoin, however I ran into a problem. Because I will make refunds if soft cap not reached. What the best way to refund everything that was ...
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1answer
93 views

how a transaction is confirmed after all block are mined (newbie)

I'm completely a newbie in crypto currency. There is a question stuck in my head: Fact: - when an amount is sent from me to someone then a transaction is created and broadcasted on network. - this ...
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1answer
8k views

Hyperledger Vs Ethereum for supply chain management? [closed]

Which is the best blockchain development platform (Hyperledger/Ethereum) for supply chain management?
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1answer
40 views

How does blockchain and decentralization work?

Does every node or computer keep track of all of every user's transactions every single dollar as a separate unit or do they group together units in transactions? (eg. transfer of 5 dollars would be ...
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0answers
212 views

ERC20 token pegged to Bitcoin using atomic swaps

How can we reliably peg an ERC20 token to the Bitcoin price using only smart contracts on the two blockchains? This would be the only way to create a truly decentralized Bitcoin-Ethereum (or any ...
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2answers
732 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 ...
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0answers
28 views

Calculating data amount being mined. Server

Does anyone know how to calculate hardware being used by mining activity on a blockchain? I'm curious what the equivalent hardware usage is in a blockchain. I'm looking for a formula of blockchain ...
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0answers
39 views

Can I use a Bitcoin client to sign a message with an Ethereum address?

If an Ethereum address is a point on the Bitcoin EC, then one can use the private key that matches that address to sign a message using bitcoin software. I'd like someone to prove they have the ...
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2answers
2k 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 ...
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1answer
47 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 ...
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1answer
71 views

BTCRelay - What incentives do relayers have to submit accurate data?

It's possible I misunderstood how BTCRelay works, but relayers submit block headers to verify from Ethereum that transactions took place in Bitcoin. What prevents relayers from committing fraud by ...
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1answer
209 views

Is it possible to create a DApp that uses Bitcoin, Lumen, etc over the Ethereum BlockChain?

I'm a total newcomer to Ethereum, so please forgive me if my Question has been answered before. I'm trying to build a DApp that allows users to "import" their current Bitcoin for example, and spend ...
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1answer
44 views

Other cryptorurrency use in smart contracts

Is it possible to use other cryptocurrency than Ether (for example, Bitcoin, Litecoin etc.) within Ethereum smart contracts? I can imagine this will not really be compatible except for other currency ...
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1answer
504 views

Can i mine with ATI Mobility Radeon HD 5400 Series GPU?

i have ATI Mobility Radeon HD 5400 Series integrated gpu in my laptop can i use it for mining ?
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2answers
64 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?
4
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1answer
255 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 ...
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1answer
46 views

Dual boot Ubuntu and Windows - Keep Ubuntu offline as backup - is it safe?

If I want to put my Ether (Or any other cryptocurrency for that matter), in an offline backup, is it safe to do it by making a transaction first to an Ubuntu (When it's online at first), and then ...
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2answers
3k views

If it's possible to recover a broken Ledger Nano S, how is it theft-proof?

I understand that if I break/lose my Ledger Nano S, it's possible to recover it if I get a new Ledger, and using my seed combination. But then it means that any hacker can do the same, no?
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1answer
48 views

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 ...