Questions tagged [ethereum]

A blockchain-based "smart contract" system with a Turing-complete contract programming language. Questions about Ethereum can also be asked on the dedicated Ethereum site: https://ethereum.stackexchange.com.

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Random election proof of stake

There are currently many cryptocurrencies based on PoS (Proof of Stake). All these PoS algorithms differ from each other. Some or maybe all of them (I don't know) implement some kind of random ...
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75 views

Is there an efficient way to get the last 200 blocks (BTC, LTC, ETH)?

I am looking for an efficient way of getting the last 200 blocks and being able to pull all transactions related to an address. I would like to do this for BTC, ETH, and LTC. Is there any way to ...
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769 views

How are ERC20 tokens sold in an ICO before being listed on exchanges?

In many places you see talk about tokens being listed on exchanges AFTER being sold in a successful ICO. How was the token sold during the ICO? Did the buyers transfer ETH / BTC to some addresses and ...
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Trading ERC-20 based token

The 12th of February 2017 numerai gave 1M NMR to 12K users. NMR is based on ERC-20 (ethereum protocol). I was one of the lucky receivers. A few months later, crypto exchanges started trading with NMR ...
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67 views

Is it possible to deploy a python script on Ethereum Virtual Network or NEO?

Is it possible to deploy a python script as a dApp on the Ethereum or NEO virtual network?
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1answer
2k views

Tax implications of withdraw fee from one exchange (Binance) to another GDAX/Coinbase

I transferred 0.2 ETH and 0.3 ETH in separate transfers from GDAX to Binance (GDAX does not charge a fee for this). Then, I transferred back from Binance to GDAX all 0.5 ETH, but since Binance ...
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1answer
29 views

“Ether” vs. “bitcoin”: I wondered when I heard Ethereum does NOT have any crypto-currency (in a Blockchain workshop by speaker)!

In my opinion, Ethereum has a native coin (crypto-currency) called "Ether". On the other hand, Ethereum allows user to create crypto-token, such as ERC-20, using smart contracts. From my point of ...
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1answer
66 views

Create wallet address on user registration for trading platform

I am creating a crypto-trading platform . I wanted to know how to create wallet address dynamically for all new registered user and also create new address for every transaction. I am using bitcoind ...
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1answer
32 views

Can a cryptocurrency be liquid while it is in its pre-sale, or even ICO

I am planning to run a Coin's ICO for several years, not interested in the gains to be made from selling out ICO in 3 days NO, but interested in using the COin to end Global Poverty as i deem fit. So ...
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1answer
35 views

Can multiple small graphic card memory collect more mining hash rate

If I set multiple 3GB GTX 1060 , It can generate more hash rate than single GTX 1070 6GB. Can I still mining ETH by this 3 Gb cards when the bloCk size of eth is over 3 Gb. EXPLAIN ME.
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33 views

What factors decides the number of tokens to generate?

Tron has decided to generate 100B tokens with some initial price? What parameters do these centralised crypto owners consider before deciding the number and price of tokens?
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96 views

Crypto currency as gift

I'm staying in Germany and I have a friend in India. He has a few ether coins in his wallet in India which he bought mid of 2017. He now wants to sell them. But in India, because of taxes, he will ...
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115 views

Ethereum mining help

Is there an integrated node, client, and miner for widows with a GUI for setup, I am having trouble setting up Geth, Ethminer, and Ethereum wallet. I can't find any information on how to send my mined ...
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1answer
248 views

How to send Ethereum from a “paper wallet address” to another address using an API?

I have an "Ethereum Paper Wallet Address" and this address has $5 USD amount of Ethereum. I want to transfer that ether to another Ethereum address using an API. Please let me know if any more ...
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1answer
501 views

Bittrex Market History Confusion

So I recently made a very small test order of Digix DAO in the Ethereum market (Using bittrex), and I noticed that it showed up in the Market History section. It looked a little like this (NOT EXACT) ...
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93 views

Receiving payments from users for over 150 coins

I would like to receive cryptocurrency payments for bitcoin, ethereum, ripple, stellar and over 150 different altcoins via my website. Similar to a cryptocurrency exchange such as Binance, I would ...
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1answer
254 views

Lost ETH due to faulty QR code on Ledger Nano S

I was transferring ETH from my Coinbase app to my Ledger Nano S. I used the QR code generated by the Ledger Ethereum Chrome app and it scanned fine. The funds, however, never reached my account. When ...
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1answer
67 views

What are options to store bitcoin or ethereum in different types of places?

I know to option to store bitcoin. 1) A wallet 2) A exchange but both are unsafe As far as i know wallet save the coins offline in your phone and hence if you break your phone or lost it coins are ...
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1answer
14k views

NVIDIA Tesla K80 vs M60, if electricity and capital wasn't a factor

If I have a setup where electricity and capital are unlimited, which GPU would be more efficient at mining cryptocurrency (such as Ethereum) between the NVIDIA Tesla K80 and the NVIDIA Tesla M60? I ...
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64 views

Why did the lightning network implement a gossip protocol?

As pointed out by many lightning developers in the past (eg Rustys 1 million channel challenge) the gossip protocol is quite noisy and a part of the BOLTs producing many engineering challenges. Today ...
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89 views

Whisper Implementation in Bitcoin

Is there some kind of implementation in bitcoin to communicate between nodes, which is similar to the Whisper Communication in Ethereum ? Whisper, is a communication protocol for DApps to communicate ...
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0answers
477 views

blockchain - Anti-virus service

I hope this is the right place to ask a question on how does block-chain help this theoretical requirement. I have also asked this question on SO; so far, no response. And, Ethereum SE is still in ...
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273 views

Blockchain, smart-contracts and migration

I'm investigating what blockchain technology to use for basically intercompany asset management assets like laptops, shares, intellectual property and other, more complex contracts where party X ...
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0answers
114 views

eth says that I just mined something: now what?

I'm using eth to GPU mine for Ethereum. After running for 10 minutes, it said: i 23:58:32|gpuminer0 Mined #7a877124… (parent: #d4e56740… ) If this were Bitcoin, I'd go check it out on ...
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0answers
62 views

Is it cheaper to store data across multiple instances of the same contract?

From what I understand, code is deduplicated on the Ethereum blockchain by storing pointers in new blocks to blocks containing code that is being reused in the new block. If that's the case: Is it ...
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Are there any smart contract systems that are self executing without the need to have an external process to initiate a smart contract?

Doing some research on smart contract systems. I want to create a self executing smart contract that can monitor external data like say the weather from an api. Currently ethereum and other smart ...
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28 views

A website that provides API for multi currencies

Can you please help me to find a wallet that provides API for multiple currencies such as: BTC, ETH, XMR, BCH, LTC, DASH. I want to create new address for each of the currencies and check if there is ...
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163 views

Is it possible to create a Dapp on top of Bitcoin?

Is it possible to create a dapp on top of bitcoin similar to how it can be done with ethereum? Can it be just as capable as ethereum?
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26 views

Can any one suggest me what is the valid process for Issuing Token in ICO

Can anyone suggest me what is the valid process for Issuing Token in ICO? Actually, I have seen some ICO that send Tokens after some delay (some time 48 hrs). I just want to know that what is the ...
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0answers
62 views

Looking for a generic wallet solution with focus on security

As above, I am looking for a coin agnostic wallet solution with all basic functionalities of a wallet, particularly multi-sig. Primary coin focus is on bitcoin, bitcoin cash, bitcoin gold, ethereum, ...
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0answers
270 views

Adding Nano S Ledger hardware wallet to Parity wallet

I used to have this here, but accidently told it to forget the contract. Now I want to add it back, but it doesn't show up. I have followed these steps: https://github.com/paritytech/parity/wiki/...
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0answers
868 views

Can Ethereum support compressed secp256k1 public keys to compute Keccak addresses?

Starting from a private key, a working functional example provides details for how an Ethereum address can be calculated from an uncompressed secp256k1 elliptic curve public key. This functional ...
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478 views

eth says I have a balance of 35 ether - etherchain can't find my address

In the ethconsole I get the following: > web3.fromWei(web3.eth.getBalance(web3.eth.coinbase), "ether") 35' When I run web3.eth.coinbase and enter the resulting 0x00f24... address into https://www....
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How to validate derivePath for HDWallet?

I am generating addresses for HDWallet while importing account using the Mnemonic Phrase. So I am letting the user enter Mnemonic Phrase and derivePath both. Before generating addresses, I want to ...
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20 views

What does “mix hash” mean in the genesis.json?

Whenever I deployed my Ethereum test net, I usually typed 'genesis.json' from the example code. In this point, all I want to know is the difference between difficulty and mix hash. I know that ...
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88 views

api limit workaround

Are there any ways to avoid limitation for api calls (5/sec)? I need the info about transactions and balance (of certain account), UTXOs and the ability to broadcast my transaction. Currently I am ...
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74 views

PoS and Block Reward in Ethereum

In Proof of Stake system, is there a block reward for creating a block? Is the reward much smaller than PoW based system? Or under the system, all coins are already distributed and the block producer'...
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What happens with ETH on swaps like the one from EOS and TRON?

I'm a bit confused about this, I have read EOS and also TRON, which currently are on Ethereum network, will swap soon to another network, and this will drop the ETH price because they need to sell ...
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185 views

Where/how is smart contract's state stored?

There're some smart contracts that only checks whether certain conditions are met. On the other hand, there're some other contracts that keep some state and the state changes by transactions calling ...
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81 views

Crossblockchain Checkpoint Consensus?

Are there any discussion threads about the topic below that can be identified? Would recording signed block checkpoints of a proof-of-stake (PoS) blockchain in a proof-of-work (PoW) blockchain by ...