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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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1answer
497 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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1answer
369 views

If the nonce is 32 bits why the proof of it is difficult?

I want to know why mining of nonce is difficult? The nonce is 32 bits (4294967296) and a high level Nvidia graphic card can check and mine it in a second. why do we need a pool to mine a blockchain?...
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1answer
114 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
18 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
246 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
64 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
33 views

How to model randomness in validators selection in PoS?

I searched a lot here and on the Internet to figure how how randomness selection of validators in PoS works? I understand it is a random selection based on fraction of stake a validator has, similar ...
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0answers
16 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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1answer
20 views

Data for time a transaction spent in a pool before it got added to a block

Is it possible to collect data for when an transaction was added to the pool to when it was added to the block?
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1answer
41 views

Crowdsale and Smart Contracts (Number)

I just need a quick clarification for crowdsale. If i have 3 rounds of crowdsale, do i need to write and execute 3 different programs at different times or submit all at a time under one program? ...
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0answers
41 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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1answer
47 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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0answers
35 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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3answers
1k views

Is there any address monitoring application with support for multiple cryptocurrencies? [closed]

This would be beneficial for all long-term investors who have many different cryptocurrencies in their portfolio and don't usually perform any transactions. Simply just to check whether your money are ...
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1answer
66 views

Generator Point G multiple

if in a curve y2 mod p = x3+ 7 mod p ( ecdsa-secp256k1) p=115792089237316195423570985008687907853269984665640564039457584007908834671663 G=...
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1answer
25 views

Blcokchain corrupt ledger

What happen to the node if we find that node on blockchain has corrupt ledger? Is the ledger sync with other ledger or get discard.
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3answers
273 views

How to create Ethereum brain address? [closed]

I have used bitaddress.org to create a brain wallet for my Bitcoin. Now I would like to create a brain wallet for my Ethereum using Bitcoin Improvement Proposals (BIP) 32/39/44/49 technologies. Is ...
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1answer
171 views

When does Ardor smart contracts come into effect and how does it work compared to Ethereum, EOS, and Lisk?

Ardor announced they are launching smart contracts on their system and how does it work compared to the other platforms like Ethereum, EOS, and Lisk?
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3answers
1k views

How to store private data in blockchain and smart contract

Following my previous question on this topic Is there a way to store and share a private key through blockchain?, I might have a solution but I would like to improve the process. Image that A is the ...
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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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3answers
103 views

Etherium based tokens [closed]

When we say certain crypto currency is based over etherium, for instance TRON, does it mean they have used etherium code from github and modified as per their use case? Or is it something completely ...
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1answer
59 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
37 views

Can I use lightning for ERC-20 (Ethereum coins)

Just finished setting up my lightnig node. It is awesome!! Does anybody knows an implementation or documentation that explains how to make it work on rinkeby or ethereum mainnet?
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2answers
71 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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1answer
31 views

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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1answer
30 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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2answers
759 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
92 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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1answer
2k views

Why are other sell limit orders being filled before mine on exchanges like gdax?

If I place a sell limit order for ETH/BTC for 4 ETH at 0.07086, when there’s currently only 0.5 ETH on it. It becomes 4.5 ETH total. Then I see it start flashing up and down, up to 10, or 20, then ...
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2answers
61 views

What are protocols in Crypto? What are token protocols?

I understand how Consensus protocols work. They are essentially rules that nodes follow in order to validate transactions and blocks. It seems as if all tokens are their own protocols. So what are ...
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4answers
145 views

is it possible to be able to buy cryptocurrencies other than bitcoin, litecoin and eth with USD

I've been looking online for quite sometime but it doesn't seem like I can find this exact answer. I've been looking to buy some cryptocurrencies but I'm hoping to be able to buy them with USD. I ...
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1answer
50 views

How does using a Turing-complete programming language compromise the security of the network? [duplicate]

I have read many places that the decision for Ethereum to use a Turing-complete programming language sparked a lot of concerns over security. From my understanding, not using a Turing-complete ...
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1answer
73 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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2answers
2k 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?
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2answers
647 views

Ethereum Code bots…Scam or not?

So new I cant even afford to trade crypto's yet, but looking and learning. I came across some Ethereum Code bot, promising 13k a day etc etc...one of those "sounds to good to be true" things really. ...
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5answers
2k views

Is it possible to schedule function calls to an Ethereum smart contract?

I am wondering - is it possible to schedule or somehow trigger function calls to an Ethereum smart contract based on the current block height or timestamp? This would involve some pre-payment of gas ...
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3answers
403 views

Does Bitcoin Blockchain solves Byzantine General Problem?

If bitcoin blockchain solves byzantine general problem, can you give an example of how it solves it? Thanks
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1answer
251 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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4answers
100 views

Exchanges and security

How can I ensure that my crypto-assets are secure when trading in a certain exchange? Even when I have my private wallet, I should deposit into theirs before trading.
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1answer
36 views

What is single member blockchain?

I just heard about single member blockchains like quorum and hyperledger-fabric. So what does single member mean? Is this some kind of restriction or what?
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0answers
22 views

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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2answers
110 views

Is it possible for there to be a virus in the blockchain?

can a blockchain ever get a 'virus', that continually replicates itself, continues paying for gas (if on the ethereum network) and survives/self-replicates through the blockchain, similar to viruses ...
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1answer
38 views

How to connect to blockchain via a “rig” miner? [closed]

I would like to connect the following rig (please see the photos) to a blockchain platform (I prefer a platform which is simpler to use :) ). Maybe this rig would not be appropriate for Bitcoin, but ...
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1answer
20 views

Ethereum alternative to bitcoind

A client have payment system that uses bitcoind wallet / daemon. I know he can expand to litecoin / dogecoin by just copy litecoind / dogecoind then console commands are almost the same. I am ...
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1answer
364 views

Is it possible to combine PoW with PoS by taking turns?

I have read about cryptocurrencies and am very excited by many. I have read that one of the worries and constant debates is Proof of Work vs Proof of State with respect to securing the validity of the ...
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2answers
467 views

Why are existing distributed database technologies not applicable to cryptocurrencies

Why are existing distribued database technologies such as mongodb not useful for hosting the blockchains of large cryptoapplications, after all they are just distributed key-value stores? how does ...
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2answers
162 views

HyperLedger Fabric from IBM is fork of Tangle or Etherium?

I read as if HL Fabric was the most interesting thing ever created on the use of blockchain, but when I read the documentation (very short) about Hyperledger Fabric I came across some coincidences. ...
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2answers
590 views

How was Ethereum hard fork's replay attack was handled?

On etherum, there was a hard fork which resulted in ETH and ETC. My reading indicates that it suffered problem of replay-attack. Question: How was this problem resolved for Ethereum? In my ...
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1answer
209 views

Who managed bitcoin and ethereum decision making? Who approves Bitcoin upgrades and forks?

To my knowledge in Bitcoin and Ethereum decision makings are decided by the miners and developers. I like to know who makes the final say on the approval of a change to Bitcoin/Ethereum code or ...
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2answers
181 views

How does blockchain technology handle the actual transaction data?

My understanding of how a transaction is secured in blockchain, especially in bitcoin, is that the output of transaction data is locked to the recipient's address (a shorter version of his public key)....