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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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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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How to prevent 51% attack on newly created coin [duplicate]

I am interested how bitcoin managed to prevent 51% attack in the beginning? I am about to create my own coin and i want miners to mine blocks. but The problem is I am afraid  51% attack might destroy ...
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2answers
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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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1answer
101 views

bitcoin block size and etherenum gas limit

I understand that bitcoin has a fixed block size (1MB). On the other hand, Etherenum does not seem to have a fixed gas limit. (https://ethereum.stackexchange.com/questions/1106/is-there-a-limit-for-...
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46 views

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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1answer
91 views

What's the point of ETHLend?

I am trying to understand what the idea behing a site like ETHLend is. IIUC, I can borrow coins for an interest, the same way I could borrow a traditional currency from a bank. That part is easy to ...
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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
36 views

Displaying price in ETH based on USD exchange rate [duplicate]

How do i get the ETH rate in USD, and stored in a variable in php?
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1answer
360 views

How to exchange bitcoins held in electrum to ethereum?

How to exchange Bitcoins to Ethereum through shapeshift.io or changelly.com, from Electrum bitcoin wallet to Jaxx ETH wallet? In electrum wallet do I need to subtract the Bitcoin mining fee manually, ...
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1answer
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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2answers
378 views

Where can I find On Balance Volume for bitcoin? (or ETH, LTC?)

I recently read about the usefulness of On balance Volume (OBV) in predicting price movement. I use GDAX and don't think it has OBV. (Or is there?) Any exchange that displays OBV? Thanks.
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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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2answers
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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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
86 views

Applying blockchain in telemedicine app involving 'video sessions with doctors' for more transparency

PS: there was no 'Blockchain' community so I'm posting the question here. Hi, I am very new to blockchain but understand the basic underlying concept of blockchain. I can understand application of ...
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1answer
250 views

Cancelled: You need some ETH in the same address as your token to pay the gas to send it

I have a problem in exchanging my altcoins, when i tried to convert TokenCard to Ethereum it is showing the following message: Cancelled: You need some ETH in the same address as your token to pay ...
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1answer
91 views

Better Crypto Currency for trading [closed]

Can anyone suggest me which crypto currency is better for trading? Is it Bitcoin or Ethereum? Prices in USD as of 21/08/2017 and time 18:03 (UTC+05:30): Bitcoin = $4041.53 or Ethereum = $325.76
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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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1answer
2k views

Transfer Bitcoin from between two different wallets

In my application i want to received payment from different user. Each user may use different wallets like mycelium, jaxx and many more... My application's wallet is in coinbase, is it possible to ...
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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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0answers
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 ...
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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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1answer
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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1answer
2k views

how much Mh/s is 15000 h/s?

) Question: When Genesis is writing 15000 h/s for 12000usd what is that in Mh/s? I plan to mine Ethereum at the speed of 15000 h/s which is the fastest speed you can buy at Genesis. Then I intend ...
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1answer
49 views

What are the biggest Proof-of-Stake roadblocks? [closed]

What are the biggest hurdles (technological or otherwise) that the Proof-of-Stake consensus algorithm must overcome to become the de facto consensus algorithm for blockchain? Or put differently, what'...
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1answer
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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1answer
2k views

Need Guide: what is the hashrate for ZOTAC P106-100 6GB GDDR5? [closed]

One vendor is offering 20 GPUs and each $224.00 . Is it good card for mining ETH and what is the best hash for this? Please let me know your experiences. Is it worth to buy for ETH or other coins?