All Questions
Tagged with cpp-ethereum cpp-ethereum or
383 questions
0
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1
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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?
- 5
0
votes
2
answers
983
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 ...
- 592
1
vote
1
answer
2k
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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.
...
- 205
0
votes
1
answer
2k
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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 ...
- 21
6
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3
answers
2k
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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 ...
- 61
2
votes
1
answer
1k
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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 ....
- 41
1
vote
1
answer
63
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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
- 229
3
votes
1
answer
1k
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 ?
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1
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0
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89
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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
vote
1
answer
440
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 ...
- 61
5
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2
answers
8k
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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 ...
- 153
1
vote
0
answers
316
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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.
...
- 227
1
vote
0
answers
161
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.
...
- 11
0
votes
1
answer
272
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 ...
- 1,121
1
vote
1
answer
174
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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
1
answer
342
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 ...
- 11
3
votes
3
answers
15k
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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 ...
1
vote
2
answers
3k
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?
- 11
0
votes
1
answer
249
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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
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 ...
- 21
3
votes
1
answer
755
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, ...
- 65
-1
votes
1
answer
212
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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
1
vote
0
answers
97
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)
- 11
5
votes
4
answers
807
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-...
- 461
1
vote
1
answer
1k
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 ...
- 11
1
vote
2
answers
2k
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 ...
- 655
2
votes
2
answers
2k
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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 <...
- 61
0
votes
2
answers
8k
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 ...
- 161
1
vote
0
answers
128
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 ...
- 141
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 ...
- 21
0
votes
2
answers
3k
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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-...
1
vote
1
answer
30
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?
- 11
3
votes
1
answer
2k
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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);
} ...
- 31
0
votes
2
answers
1k
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 ...
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2
votes
3
answers
852
views
Hi, is Ethereum MIt licensed?
is Ethereum MIt licensed? Can we use it for business purpose?
1
vote
1
answer
235
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?...
- 11
0
votes
1
answer
1k
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
2
answers
547
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
1
answer
271
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: ...
- 3
2
votes
1
answer
9k
views
CUDA ERROR : Cannot allocate big buffer for DAG
Windows Config
Windows 10
Ram 8GB DDR4
1TB HDD
Vertual Ram set max at 20000mb
Still having CUDA error.
GPU GTX 1060 3 GB x 2
GPU GTX 1060 6 GB x 3
Total 5 GPU
- 21
1
vote
1
answer
329
views
web3.admin.addpeers return BigNumber Error
When I using ethconsole to deal with a private chain. I hope it can connects to another node which I get the node information.
But the command "web3.admin.addPeer("enode://[email protected]:30304",...
- 13
0
votes
1
answer
185
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cpp-ethereum Current block number is 0
I have using eth --private "customChain" --genesis-json genesis.json --db-path data" to create a private chain.
and when I into ethconsole it shows:
Connecting to node at \\.\pipe\geth.ipc
Connection ...
- 13
0
votes
1
answer
109
views
Feedback the cheat and fraud of etc eth on twitter. How can i recover my loss?
Eth and etc arg two great projects.
As i can't find the etc email, hope you can kindly cc to etc too, thanks.
A few days ago on Twitter to search for the etheric classic, found an account, and read ...
- 11
0
votes
1
answer
96
views
What happens to the ETH if the contract is canceled?
I sent ETH to a company during their ICO. The contract, on Etherscan shows, Warning! Error encountered during contract execution [Bad instruction] and the contract was canceled. My question is what ...
- 3
5
votes
3
answers
6k
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How store ETH in a smart contract
The question it's How store Ether in a smart contract.
In first step, I try transfer the transaction value to the smartcontract address doing something y something like that:
function storeETH() ...
1
vote
2
answers
102
views
Is it possible to fork ethereum so that only specified account(s) can deploy new contract?
Blockchains supporting smart contract are sometimes compared with smartphones in the sense that it is an infrastructure opened to host an indefinite number of Apps, any participant can create and ...
- 73
-1
votes
1
answer
269
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Whats wrong with this?
I know I'm not actively mining eth but I can't figure out whats wrong:
Found suitable OpenCL device [Turks ] with 2147483648 bytes of GPU memory
m 19:19:56|main Getting work package...
m 19:19:...
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-2
votes
1
answer
839
views
How to sent ETH from Parity command line
I was wondering if it is possible to send ETH using the parity command line, without opening the browser and going to the address 127.0.0.1:8080. I want to host my Parity instance on a headless ...
- 49
2
votes
0
answers
4k
views
How to send ERC20 Tokens to multiple addresses? [duplicate]
I've been 2 days trying to do it, with no success.
I need to send Tokens to 1300 addresses that participated in the Bounty/Airdrop and I can't send manually one by one, that would take a lot of time ...
- 51
1
vote
1
answer
352
views
How to invoke multiple oracaliszed queries from a single contract
I want to invoke 2 different orcalized queries from the same contract. I saw a few posts but none of the answer works. Is there any way we can do that? Here is my contract. I was expecting this ...
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