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Questions tagged [cpp-ethereum]

The Ethereum C++ client.

0
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1answer
12 views

Metamask does not react on delivering gasPrice

I am using following code to generate a new transaction using web3.js & metamask: var web3dictdata = { gasPrice: web3.toHex(10), gasLimit: web3.toHex(210000), to: "...
1
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0answers
25 views

Parsing ethereum chaindata using leveldb

I'm new here :) I'm writing a c++ program that parses ethereum chain data. As of present I was able to get the key value pairs by using leveldb::ReadOptions command (as illustrated in the below code) ...
2
votes
2answers
34 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?
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1answer
15 views

Where Can Find the Ethereum source code on Proof Of Stake

Looking to find the implementation of Ethereum Proof of Stake Source Code on GitHub.
2
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2answers
75 views

Any quick, easy ways to convert ERC-20 tokens?

Are there any quick ways to convert my Airdrop ERC-20 tokens from various old ETH wallets to ETH/BTC...? Looks like I've got a few hundred $ kicking around in old Airdrop tokens. I've seen a few ...
0
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1answer
11 views

is there any problem if i put GETH/PARITY and webserver in one server?

my website need to use something about ETH,so i have to setup a geth/parity rpc server. is there any problem if i set the geth/parity rpc in my webserver?
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1answer
18 views

Connecting to Ethereum Clients from C application

web3.js is a great library to communicate with client node. I have tried using socket programming from C application to first reach nodejs web app in order to make use of web3.js services to reach a ...
1
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1answer
32 views

When do you get eth when mining eth?

I ran Claymore's eth miner for 8 hours and got 200 shares. I set my eth address when I ran the miner, but no eth was deposited to my address. When I restarted the miner the shares were reset to 0. ...
0
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1answer
26 views

How is this possible from only one worker/PC?

So I was clicking around on the Ethermine.org site the other day to check out some folks's ETH performance levels and came across one that has me deeply pondering on how he is doing his mining. I ...
4
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1answer
114 views

How to exchange ETH to DAI with web3 and node.js

I looking for solution how to convert eth to dai with web3 api. something like https://kyber.network/swap/eth_knc (I can send eth to specyfic contract adress and I receive back DAI to the same ...
1
vote
1answer
33 views

What is a active wallet vs inactive

In Apr. empower had an airdrop that they said only wallets that had .1 ETH. would get it. Was that the customary requirement in Jan when the crypto blockchain was jammed?. And wasn't that lowered to ....
1
vote
1answer
18 views

Where is the state root being updated in Aleth CPP?

Can someone point me to where the state root is updated after each transaction is executed in the block? This is for Aleth
2
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1answer
84 views

How Do I take a Snapshot and Migrate Token Holders to a new ERC20 Contract?

I want to Migrate my ERC20 Contract to a new Address, How do I do this ?
1
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0answers
22 views

can erc20 token transaction work on Fast Sync-ed node ? OR it need Full node to transact any token?

I need help regarding couple doubts. Which sync method is good for me. My client is asking me to make an Exchange website. Also ERC20 tokens will get transacted in this exchange. Do I need a full ...
1
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1answer
34 views

How to use / see refunded gas in ETH blockchain?

I buy a GAStoken contract which requires say 21000 GAS at 1 Gwei and later when we delete/destroy the contract when the Gwei is around 50. I understand that we will get around 50% refund of GAS at the ...
1
vote
2answers
189 views

How do you create a new contract instance with an address *and* arguments?

There is the standard way of creating contract instances with the new keyword where you pass arguments like: MyContract mine = new MyContract(arg1, arg2); Then there is another way, like in this ...
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0answers
36 views

How do I get a merkle proof (stateHash) from the merkle patricia trie?

So I understand how a patricia trie works, it's a trie using 0 to f as root nodes, and it also removes empty nodes to make leafs and extensions. What I don't get is how the stateRoot hash is made. ...
1
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0answers
55 views

Setting up a server to run a geth node - what hardware would you recommend?

I am planning to run a geth node 24/7 on a server, what hardware specs would you recommend for this? I'd like to download the chain pretty fast and want the block download to be consistently quick. ...
0
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1answer
38 views

How make other machines join my private ethereum network.

I have created a private ethereum network in my machine, and now I want that other machines join my network. I think I have to send them the IP of the bootnode, but the question is : what about the ...
1
vote
1answer
33 views

Smart Contract Balance = 0

Ok, I am pretty new to developing contracts, and I did so by using dAPP and truffle. But when adding it to the chain, it says there is no balance to the contract. How can I add tokens to be bought? ...
1
vote
1answer
64 views

Best practice in 2018 to claim Ethereum presale purchase [duplicate]

I have the presale wallet and password, but went through a number of trials and just now trying to get back on my feet. I have yet to claim my presale and could really use it to help with medical ...
0
votes
2answers
217 views

How to fetch ETH/USD price from the coinmarketcap api

I want to fetch the current ETH-USD price from this api (https://api.coinmarketcap.com/v1/ticker/ethereum/?convert=USD). How do I fetch just the price into a variable in PHP for reuse on my ...
0
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0answers
24 views

what sealers get in return of sealing a block in ethereum

I'm confuse in mining or sealing rewards, In POW miners get the rewards of mining a block but in POA who have pre defined nodes , what those sealers get in return of sealing a block in POA.
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1answer
153 views

Internal Token Transfer without ETH fee

Need to move all token from one address to another address(Internal) without fees. Could you please help me to solve this?
0
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1answer
28 views

Transaction Pending and Dropped

I have a transaction pending from 4 days. I have tried to unlock following this answer: MyEtherWallet is pending and dropping. It looks like it is stuck in a loop for 2 days? Now the current nonce is ...
1
vote
0answers
117 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 ...
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0answers
21 views

Manually add peers in pyethapp

Is there a way to manually add peers on a pyethapp client? I am looking for an equivalent of geth console's admin.addPeers().
3
votes
1answer
174 views

Details about w3.eth.account.create()

I am currently getting started into developing involving Ethereum. I know what the function w3.eth.account.create() does and returns but I am unsure what happens behind the scenes. Specifically, ...
-1
votes
1answer
37 views

Generate ETH address with button on my website

I'd like to open a website that I can easily generate an ETH address like this website: http://taschh.com/microworkers/cv/generate/ Of course, I will have all of ETH address and its private key. I don'...
1
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0answers
42 views

Can the unitsOneEthCanBuy value be changed after Token creation? [closed]

How can I change the value of "unitsOneEthCanBuy" in the contract ? (As the Token is only created & ICO has n't happened)
5
votes
4answers
245 views

Why do you want to use different implementations of EVM?

Currently there are many implementations of EVM (Java, C++, Python, Go, etc). For example: I will be using Solidity to write DApp on the top of EVM-Java and EVM-Python, why would I want to use EVM-...
1
vote
1answer
80 views

how to batch send eth or erc20 from multiple address to one address?

How to batch send eth or erc20 from multiple address to one address? How to do it with code? For example, I have 30 eth address. I want to from 30 eth address Transferring to the one account in ...
1
vote
1answer
283 views

Does an ERC-20 token transfer cost more gas than an ETH transfer?

After messing around on the Remix IDE, I realized that initializing a uint (to any value other than 0) costs about 20,000 gas. Because of this, an ERC-20 token transfer to an account with balance 0 ...
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0answers
110 views

How to run eWASM on V8?

I know the project is still on-going, did anyone go through the process to run the eWASM on V8? What I have tried: install v8 checkout solidity: https://github.com/ethereum/solidity, and built it ...
2
votes
1answer
377 views

Decoding ethereum leveldb keys and values

I've created a simple script to read ethereum data from the leveldb using C++. Basically this testing program would print all keys in leveldb to the console. #include <cassert> #include <...
0
votes
0answers
28 views

installation of ethereum wallet and its block sunc

hello iam a computer since student : i want to ask about installation in ethereum installer , and wallet .the blocks will be sync in my pc after this it can work yes ! so once i get problem i dont ...
0
votes
2answers
842 views

How to listen to events generated by an existing contract in web3 1.x.x?

Currently I'm unable to find a working solution. Let's say I have the following smartcontract: contract Manufacturer { event LogNewOrder(string order); string[] public orders; function ...
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0answers
72 views

Library for create ethereum wallet

I want to create an ethereum wallet that is erc20 compatible on my client side. It should allow user to enter his own password and generate private key, recovery phrases and utc file. I try to ...
2
votes
2answers
275 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 ...
0
votes
0answers
59 views

How to duplicate functionality of web3.eth.accounts.signTransaction API using cpp-ethereum libraries

Using the private key and transaction provided in the second example for the Web3 signTransaction API given at https://web3js.readthedocs.io/en/1.0/web3-eth-accounts.html#signtransaction, I am ...
0
votes
2answers
252 views

Solidity Smart Contract auto withdrawal (ETH)

I'm kinda new to smart contracts, searched a lot, but hope someone here can help me out. I'll try to explain as good as I can. I'm mining Ethereum with a couple of rigs. Each individual rig auto-...
0
votes
1answer
14 views

tokens and coins based on ETH

I intend to trade tokens and coins using MyEtherWallet. Is it possible to use MEW to do Tx's between ALL coins and tokens, or is the wallet limit to a specific list?
3
votes
2answers
783 views

Invalid address error

I keep getting Error: Invalid address when trying to run the application. My current setup of web3 using infura node is if (typeof web3 !== 'undefined') { web3 = new Web3(web3.currentProvider); } ...
0
votes
2answers
243 views

How to make an action to send record to my database?

I want all transaction of the tokens send to my database through smart contract. For example, A send 10Token to B, it will show on blockchain, but I also want a function which smart contract will let ...
0
votes
2answers
129 views

Hi, is Ethereum MIt licensed?

is Ethereum MIt licensed? Can we use it for business purpose?
1
vote
1answer
141 views

Everyone is asking Now is Ethereum still ASIC Resistant? [duplicate]

According to Bitmain - plus other 3 company in china, that they will lunch Asic Miner Machine for Ethereum this 2nd Quarter 2018. My question is there any way that ethereum can prevent this to happen?...
0
votes
1answer
178 views

Convert contract arguments to ABI-encoded format

My Contract Source https://gist.github.com/munggo/ed25afb0aff9169a6c57f1d464d13177 Convert contract arguments to ABI-encoded format How???
0
votes
0answers
43 views

Sending Fail- eth from nano s to primablock

I have attempted numerous times to send ethereum from nano s ledger wallet to primablock for an ICO presale and keep getting this message: Fail Warning error encountered during contract execution ...
0
votes
2answers
101 views

solidity - forever can't return the msg.sender balance

this is my contract code pragma solidity ^0.4.4; contract IamHongKongTokenBack_00{ // 現在我錢包的地址+Eth量 function SeeMyAddAndETHVar() public constant returns (address, uint) { address _myadd = msg....
0
votes
1answer
123 views

Verify Contract Code Eth

I'm trying to verify an erc20 Contract code for a few days. I have read a lot and tried but just can not get on. maybe someone can help me? Here are the dates: /* Implements EIP20 token standard: ...