Questions tagged [bitcoin]

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

Filter by
Sorted by
Tagged with
0
votes
0answers
28 views

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 ...
0
votes
0answers
14 views

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?
2
votes
1answer
30 views

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 ...
0
votes
0answers
14 views

Difference between UTXO based smart contract and Account based Smart contracts [duplicate]

I want to understand the difference between UTXO based smart contract(Bitcoin scripting and Komodo's CC) and account based smart contract (Ethereum). What are the different pro and cons for these two ...
1
vote
0answers
50 views

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 ...
0
votes
0answers
16 views

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 ...
0
votes
1answer
48 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. ...
0
votes
2answers
106 views

What are differences between bitcoin and etherum trancactions?

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 ...
0
votes
2answers
64 views

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 ...
0
votes
1answer
37 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’ ...
0
votes
1answer
152 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 ...
0
votes
0answers
22 views

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 ...
0
votes
1answer
73 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 ...
1
vote
0answers
25 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....
4
votes
2answers
729 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 ...
1
vote
0answers
20 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.
0
votes
1answer
44 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 ...
1
vote
1answer
249 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 - ...
5
votes
1answer
966 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 ...
1
vote
0answers
32 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 ...
1
vote
1answer
185 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 ...
1
vote
0answers
103 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 ...
1
vote
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 ...
2
votes
1answer
61 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 ...
4
votes
2answers
68 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 ...
1
vote
2answers
273 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 ...
0
votes
1answer
27 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.
1
vote
0answers
36 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 ...
0
votes
1answer
30 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 ...
1
vote
3answers
518 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 ...
0
votes
1answer
49 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 ...
0
votes
1answer
145 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?
0
votes
1answer
379 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 ...
0
votes
1answer
42 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 ...
1
vote
2answers
129 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 ...
4
votes
2answers
403 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 ...
0
votes
2answers
44 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 ...
1
vote
2answers
484 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 ?
1
vote
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 ...
0
votes
1answer
274 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
votes
1answer
212 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 ...
0
votes
1answer
136 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 ...
3
votes
1answer
9k views

Hyperledger Vs Ethereum for supply chain management? [closed]

Which is the best blockchain development platform (Hyperledger/Ethereum) for supply chain management?
1
vote
1answer
43 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 ...
2
votes
2answers
844 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 ...
1
vote
0answers
30 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 ...
2
votes
0answers
69 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 ...
14
votes
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 ...
2
votes
2answers
85 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 ...
0
votes
1answer
83 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 ...