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5 votes
2 answers
7k views

How to implement role-based access control to user's private data?

We have this application scenario and try to see if Ethereum, or blockchain in general, is a good solution for this. The basic idea is the user controls a small amount of private sensitive data (e.g....
user10375's user avatar
  • 177
4 votes
1 answer
649 views

Can geth and eth share the same accounts and blockchain?

It appears when I have multiple ethereum clients installed, that they all have their own data, accounts and even their own copy of the blockchain. Is it possible to share accounts and the blockchain ...
q9f's user avatar
  • 33k
4 votes
1 answer
538 views

Does Eth have an equivalent to Geth's --fast flag?

In a previous question, I asked how Geth's --fast flag worked. I'm now moving over to using Eth, so my question is: is there an equivalent option to allow Eth to quickly sync the block data? If so, ...
Richard Horrocks's user avatar
4 votes
3 answers
2k views

Why write an EVM in bytecode, and not in something like Python or Go?

I know that Ethereum runs in virtual byte code and there's a javascript-like wrapper language called Solidity. This question is about why the developers chose this approach? What makes it infeasible ...
nick carraway's user avatar
3 votes
0 answers
501 views

SSL Support for Communication Between Geth Nodes

We are using private Ethereum network for a multi entity use-case. The problem is that all these entities geth nodes sits behind a firewall which only allows TLS traffic. The node that's broadcasting ...
Narayan Prusty's user avatar
3 votes
0 answers
574 views

How can i confirm transaction in geth from other peer of blockchain?

I have a query , I have create a private blockchain in which one geth node1 is use for transaction taking and other one(node2) is for mining .They are peered with each other and perfectly ...
Himanshu sharma's user avatar
2 votes
2 answers
476 views

Why immutable contracts [closed]

I'm a seasoned engineer, but quite new to blockchain technologies. I'm trying to grasp the "why" and the real "value" of immutable contracts. Never seen or heard of pieces of software being ...
ehanoc's user avatar
  • 167
2 votes
2 answers
574 views

Identify the block which contains a tx

I am deploying a Smart Contract to a private blockchain. Is it possible to get when your node receives the smart contract? Is it possible to identify the block which contains the smart contract? how?
sapiensapiens's user avatar
2 votes
2 answers
2k views

Delete/hide ETH address on Ledger Nano S

Is it possible to delete / hide one of ETH addresses that my Ledger Nano S is providing after logging via MyEtherWallet? I know ledger is allowing me to use lots of addresses. It is displaying the ...
user1029968's user avatar
2 votes
0 answers
47 views

geth full node is too slwo.Only about 50 blocks can be synchronized per minute

geth full node is too slwo.Only about 50 blocks can be synchronized per minute However I use snap mode to sync very quickly. Unfortunately what I need receipts for all transactions. this is my server: ...
Mashaji's user avatar
  • 21
2 votes
0 answers
500 views

Hashing Algorithm Equality in zk-SNARK [closed]

I am looking to implement the zk-SNARK capabilities of Ethereum to allow a user to prove that they have all the components required ('a', 'b', 'c', 'd') to create a publicly known hash 'x'. My general ...
MSM's user avatar
  • 21
2 votes
0 answers
265 views

Need help to run a function on contract but get Big Number error [duplicate]

var myContract = web3.eth.contract(abi) var myContractInstance = myContract.at(address) myContractInstance.func.call() Get Error: new BigNumber() not a base 16 number: EDIT: if anyone comes ...
Guest8556's user avatar
2 votes
0 answers
54 views

How to clear Ethereum chain data on windows? [duplicate]

I'm using the ethereum wallet, which uses geth. I keep getting the time out of sync error message. I know i need to clear my bad chaindata. How do i do this?
Jethro82's user avatar
  • 115
2 votes
0 answers
29 views

Block data duplication when moving from Geth to Eth (or vice versa) [duplicate]

I've so far been using Geth (the Go client) as my client of choice. I'm now interested in using the Mix IDE, a requirement of which is that I use Eth (the C++ client) instead. I've already synced the ...
Richard Horrocks's user avatar
1 vote
0 answers
75 views

Uniswapv2 "quote" ABI

I am trying to sign contractof Uniswapv2 on ethereum mainnet using "quote" ABI. the function is quote(uint amountA, uint reserveA, uint reserveB) I use c++ to make the raw transaction and ...
Biruk Damte's user avatar
1 vote
0 answers
34 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 ...
D Rack's user avatar
  • 11
1 vote
0 answers
126 views

What is a sealer and what is the difference between Ethhash, NoProof and BasicAuthority sealers?

Default sealer in cpp-ethereum is NoProof: https://github.com/ethereum/cpp-ethereum/blob/43bae2c78e2a968ef4eb37bec2da4d9b85fa2392/libethcore/ChainOperationParams.h#L73 But I don't understand what is ...
NewTwoEth's user avatar
  • 270
1 vote
0 answers
70 views

What do the progress bars on the Alethzero "blockchain download" window mean?

I'm exploring Alethzero. What do the progress bars in the "blockchain download" window mean? I'm seeing this: I'm assuming this relates to the progress in dowloading the blockchain but I can't work ...
Lee's user avatar
  • 8,618
0 votes
1 answer
261 views

The "why" of immutable contracts [duplicate]

I'm new to blockchain technologies and I'm trying to grasp the "why" and the real "value" of immutable contracts. In software engineering is pretty much accepted that no piece of logic is ever ...
ehanoc's user avatar
  • 167
0 votes
1 answer
100 views

web3py Force send eth transaction at the same block without conformation or any errors

My question is how to force send a transaction via web3 or any other way without paying attention to errors. I know that I will pay for the commission if I am not successful and that will suit me. I'm ...
404's user avatar
  • 33
0 votes
1 answer
25 views

I want to retieve data from contract A that has been already stored in the contract B by contract A?

dex.sol(contract A) //SPDX-License-Identifier: MIT pragma solidity 0.8.19; import "./storage.sol"; contract dex1{ storage_contract public contractaddress; constructor(address ...
kumar's user avatar
  • 71
0 votes
1 answer
27 views

Which ways do I have to get ethereum node?

I want to know which ways I could get ethereum node besides setting up one on my own server. I need node in order for my application to work with ethereum blockchain.
Zeus's user avatar
  • 9
0 votes
0 answers
18 views

Private Node Network-GoEth

i am trying to install private network of three nodes on my single laptop. i did following: install go-eth. used a medium article and followed instructions when i try to connect nodes with each other,...
Mohsin Munir's user avatar
0 votes
1 answer
459 views

Some one make a fake token transfer from my friend wallet without having his PK

Now how is that possible? https://etherscan.io/address/0x781C2EA34506d904573E7E92be19154B729B2EE5#tokentxns this guy send 65 ETH to an address but some scammers sent 65 ETH token(fake) with his ...
Vahid Rasizadeh's user avatar
0 votes
1 answer
158 views

How to use web3 to send ETH from wallet A to wallet B through an intermediary Smart Contract?

I want to send eth from 1 wallet address A to wallet B address but through an intermediary Smart contract, what should I do? I don't know how to solve that problem yet. EX: https://bscscan.com/tx/...
Review ICO ANHZAIBRO's user avatar
0 votes
1 answer
159 views

plug our own consensus in any one of ethereum client? [duplicate]

Actually i try to add new consensus and will through modifying some consensus to see its effect on transaction throughput. so what platform should i use that provide me this facility or should i use ...
hafsa sarfraz's user avatar
0 votes
1 answer
99 views

Smart contract development

I have read at many places peoples require someone with an excellent experience to develop and deploy a smart contract for ICO Here my question is, what exactly smart contract is here? Does ...
shawn's user avatar
  • 409