Questions tagged [cpp-ethereum]

The Ethereum C++ client.

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2k 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 ...
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2answers
528 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?
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1answer
61 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 ...
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0answers
275 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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1answer
294 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, ...
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1answer
162 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'...
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0answers
64 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)
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4answers
485 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-...
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1answer
230 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 ...
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2answers
475 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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2answers
752 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 <...
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2answers
3k 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
114 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 ...
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2answers
558 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 ...
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2answers
516 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-...
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1answer
26 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?
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2answers
1k 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); } ...
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2answers
455 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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3answers
358 views

Hi, is Ethereum MIt licensed?

is Ethereum MIt licensed? Can we use it for business purpose?
1
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1answer
177 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
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1answer
375 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???
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2answers
210 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....
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1answer
181 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: ...
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1answer
6k 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
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1answer
210 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://...@192.168.1.29:30304",...
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1answer
135 views

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 ...
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1answer
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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 ...
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1answer
43 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 ...
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3answers
2k views

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() ...
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2answers
45 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 ...
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1answer
86 views

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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1answer
736 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 ...
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0answers
3k 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 ...
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1answer
291 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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1answer
432 views

I sent ETH to my receiving contract address [closed]

I sent ETH to one of my receiving address which is contract address. But this receiving contract address was my personal trading wallet address. But, no transaction I'd has been received. When will I ...
5
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1answer
448 views

Ethereum Merkle Patricia Trie and Hashes

In Ethereum, there's a hash of all of the 3 tries in each block. Out of curiosity. The docs state that the functionality is supposed to just provide a mapping between 160bit keys and values. I find ...
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1answer
84 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 ...
5
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2answers
745 views

Ethereum Merkle Patricia Trie (Extension node)

I do not have time to look through the source code right now. My questions is: In Ethereum, when is the decision to replace part of a given path with an Extension-node made? I suppose the sole idea ...
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0answers
31 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 ...
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2answers
62 views

ETC transaction doesn't reflect in myetherwallet -help

I just transfer ETC from my POLO account to the ledger nano s using myetherwallet, Ans something wired happend : Here i dont see that i got anything https://etherscan.io/address/...
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1answer
52 views

I transferred coins to an address that belongs to ETH wallet instead of ETC [duplicate]

I have a problem. so, Ask for help. by mistake, I transferred coins to an address that belongs to ETH wallet instead of ETC. Is ther a solution for this? Pleas, see below.
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1answer
145 views

keep records of who did send tokens , smart contract

I am trying to create a contract that only allow people who did send amount of wei to the token , to access a get function by keeping a record of all address & amount . is it possible to do that ? ...
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1answer
28 views

Spool out result using solidity

Does Solidity have any keyword to spool out results into an external file like .txt or .csv or .dat?
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1answer
48 views

how to prevent spam block attacks in cpp ethereum?

it is really annoying. I'm running a sync with eth and every 1 or 3 hours there come giant spam block attacks, which slow down syncing dramatically. I delete network.rlp, restart eth and everything is ...
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1answer
45 views

strange log message in cpp-ethereum eth-log

I see a strange message in my eth-log: [35m⚙^[[97m ◌ ^[[35m07:26:46 AM.561^[[0m^[[30m|^[[34meth^[ [0m Paying 63 szabo^[[0m from sender for gas ( ^[[34m21000^[ [0m gas at 3 Gwei^[[0m ) (sorry for ...
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2answers
1k views

Error: listen EADDRINUSE :::8545

C:\Users\Kane>testrpc EthereumJS TestRPC v6.0.3 (ganache-core: 2.0.2) C:\Users\Kane\AppData\Roaming\npm\node_modules\ethereumjs-testrpc\build\cli.node.js:74143 ... ... ******Error: listen ...
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2answers
471 views

geth attach issue between mac and windows

I am running geth on windows machine and try for geth attach in mac. I give below error: Fatal: Failed to start the JavaScript console: api modules: Post http://192.168.0.107:8545: context deadline ...
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2answers
921 views

ETH Block Rewards?

So, I'm still fairly new to ETH mining and I have recently heard about something called Block Rewards. I have read a bit on them via Googling, basically sounds like at some point, a miner can ...
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3answers
235 views

Unable to transfer entire balance? what is the minimun amount needed for transfer?

Trying to transfer from myEtherwallet and it says "insufficient funds" - I lowered the amount and it worked, but I can't get the rest out. I've been searching for several hours (I told you I'm a ...
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0answers
121 views

Can I use ethminer with just OpenGL

I have created a windows server EC2/GPU instance, downloaded the proper version of ethermine and tried to start mining. It says that it won't work thanks to no OpenCL or CUDa. This is confirmed by ...