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Questions tagged [contract-deployment]

The act of pushing a compiled smart contract in byte code to the Ethereum blockchain.

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134 votes
7 answers
73k views

How is the address of an Ethereum contract computed?

How is the address of an Ethereum contract computed? What use cases are there for knowing a contract's address in advance?
eth's user avatar
  • 85.9k
20 votes
2 answers
7k views

Deploying the Greeter contract via the geth CLI is not registering in my private blockchain

I am running a local private Ethereum blockchain using: geth --networkid 60098 --genesis CustomGenesis.json --nodiscover --maxpeers 0 --rpc --rpccorsdomain "http://localhost:3000" --datadir "./data" ...
Bill LaPrise's user avatar
30 votes
4 answers
33k views

Calling function from deployed contract

I want to know how to instantiate an existing contract deployed on the blockchain using its address. e.g: contract A { function f1() {} } A is deployed on the blockchain, and in contract B I ...
Sig Touri's user avatar
  • 1,090
16 votes
1 answer
4k views

Bytecode on block chain different from the one used when deploying

When I deploy a contract from node.js using the web3 JavaScript API (connected to a locally running geth), and then check the deployed bytecode using eth.getCode(address) (either from the JS console ...
mazi's user avatar
  • 443
14 votes
5 answers
6k views

How to Compile and Deploy a Smart Contract without running a full node?

I'm new to solidity and smart contract programming. I have already made and deploy smart contracts successfully, but always using Mist. Now I'm not able to do so, because I can't complete a node ...
Moisés Briseño Estrello's user avatar
64 votes
7 answers
17k views

How can I verify that a contract on the blockchain matches the source code?

Given the (Solidity) source code of a smart contract, is there a way to deterministically compile the code and compare it with the code on the blockchain? I want to verify that the contract does what ...
J-B's user avatar
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17 votes
1 answer
3k views

What's the difference between solc's bin bytecode versus bin runtime?

Solc says that bin-runtime is the runtime part of the contracts. What exactly is the runtime bytecode part and how does it differ from bin bytecode output?
dbryson's user avatar
  • 6,393
42 votes
2 answers
10k views

Do contracts also have a nonce?

Do contracts also have a nonce and if so how is it calculated? Usual accounts have a nonce that is increased with every transaction. However, contracts can't make transactions, they can only make ...
mKoeppelmann's user avatar
  • 7,626
29 votes
5 answers
22k views

What is the real price of deploying a contract on the Mainnet?

I'm trying to deploy a contract on the mainnet, but I've been getting some issues deploying with Truffle. ➜ ballot git:(master) ✗ truffle migrate --network mainnet --dry-run Using network 'mainnet' (...
V. Kartoplya's user avatar
24 votes
7 answers
34k views

Encoding/Decoding contract ABI data

How to encode and decode ABI data? Can someone show me an example with web3js library?
gkucmierz's user avatar
  • 773
15 votes
2 answers
6k views

Truffle Migrations Account Locked Error with --network command

I have started a private blockchain using the command, geth --networkid 1337 --datadir ~/home/xyz/testnet --ipcpath /home/xyz/.ethereum/geth.ipc --rpc --rpcapi eth,web3 --rpcport 8545 --rpcaddr ...
godimedia's user avatar
  • 253
7 votes
1 answer
2k views

How to call Library Function from a Contract? => [error] The contract code couldn't be stored, please check your gas amount. undefined

When I compiled following code at "https://ethereum.github.io/browser-solidity/" it gives me two Web3 deploy code for: var libraryContract = web3.eth.contract(...); //Web3 deploy code var ...
alper's user avatar
  • 8,395
15 votes
1 answer
5k views

Deploying contract with constructor arguments via Geth RPC

How can I deploy a compiled contract with constructor arguments using geth rpc? I have tested my call deployed the compiled contract bytecode just fine, I just don't understand how I can pass ...
Samuel Barnes's user avatar
14 votes
5 answers
3k views

Error: The contract code couldn't be stored, please check your gas amount

I am using the below code to create the contact it give the error: Error: The contract code couldn't be stored, please check your gas amount. Code: primaryAccount = web3.eth.accounts[0]; //...
Veera Sarma's user avatar
3 votes
3 answers
2k views

Brownie cannot locate deploy.py script

I have python installed on my system (Windows) with Anaconda from a prior course I had taken which may be the root cause of the issue. I'm at the stage where I need to run a deploy.py script to deploy ...
NickS's user avatar
  • 33
23 votes
1 answer
14k views

At which point the smart contracts get executed?

Let's say I sent a transaction to invoke a smart contract (to its address). At which point will the smart contract get executed? Is it during the transaction validation process? Also, is there any ...
Prabath Siriwardena's user avatar
19 votes
2 answers
12k views

How to pass constructor parameters to a contract using Truffle?

I am using testrpc and truffle for deploying contracts.I want to pass constructor parameters while deploying. contract User { string public userName; function User(string ...
Crissi Mariam Robert's user avatar
6 votes
3 answers
4k views

Block gas limit exceeded when compiling contract Solidity browser

Using Solidity Browser ( https://ethereum.github.io/browser-solidity/ ) to mine a contract on testnet with injected web3 and metamask account, throws this error: callback contain no result Gas ...
Juan Ignacio Pérez Sacristán's user avatar
3 votes
1 answer
3k views

Greeter variables are all undefined and contract doesn't run

I'm attempting to run the greeter contract on the live network. I'm following the commands as per the official tutorial, which worked on a test network when I tried it a while ago (on a different ...
Richard Horrocks's user avatar
46 votes
3 answers
22k views

How to write an optimized (gas-cost) smart contract?

As we all know, there are many factors that determine a good smart contract, such as: Security: it has minimal/zero vulnerability so they cannot be exploited by an adversary. Immune to Attacks. Cost:...
Aydin's user avatar
  • 2,117
13 votes
1 answer
4k views

How to generate a vanity address for a smart contract to be deployed on?

I am aware of the possibility to generate vanity addresses for normal accounts. However, how is possible to generate vanity addresses for external owned accounts (which host smart contracts)? I'm ...
q9f's user avatar
  • 32.9k
11 votes
2 answers
7k views

How big could a contract be?

I am trying to figure out how big could a contract be? Is it possible to have 10k functions? One million? More? Is there any restriction on the function's body size? Does a bigger contract need ...
StanislavL's user avatar
7 votes
1 answer
3k views

How can I deploy a contract with reference to a library contract without using a graphical user interface like Browser Solidity?

I am using Solidity Browser to deploy a contract due to from Library contract method failing #2831 issue. On this following answer https://ethereum.stackexchange.com/a/9181/4575 I have guided to use ...
alper's user avatar
  • 8,395
7 votes
2 answers
2k views

Is there any limitation for the number of the return values from Solidity functions?

Answer of this question (https://ethereum.stackexchange.com/a/3590/4575) says that: "I am not allowed to return dynamic arrays from Solidity functions yet." On the other hand, Solidity supports ...
alper's user avatar
  • 8,395
6 votes
2 answers
4k views

Interaction with a deployed smart contract from the geth command line

I have a contract which I'd like to be able to sum numbers submitted by any other address: contract UnitCounter { mapping (address => uint256) public UnitsFrom; uint256 public TotalUnits; ...
Lee's user avatar
  • 8,568
6 votes
1 answer
4k views

How many contract are currently deployed on the Ethereum blockchain?

I was recently asked what percentage of transactions represent smart contract deployments on Ethereum, and had no immediate answer. It is probably easier to ask how many contracts are currently ...
Joël's user avatar
  • 1,720
5 votes
2 answers
1k views

What is the memory expansion cost?

I am trying to understand the memory expansion cost. We can see in the Ethereum Yellow Paper that there's this formula to count the memory cost: Now, it's also said that this formula doesn't include ...
Nika Kurashvili's user avatar
5 votes
3 answers
3k views

Why is my Greeter contract not mined on --testnet?

I'm working on the contracts tutorial. Here's the code (including contract): var greeterSource = 'contract mortal { address owner; function mortal() { owner = msg.sender; } function kill() { if (msg....
TMOTTM's user avatar
  • 1,953
4 votes
1 answer
831 views

Understanding TokenCreator/OwnedToken example from Solidity documentation

Here's the page containing the example https://solidity.readthedocs.io Here are two contracts that are supposed to work together(my questions are below): Here's how I think it works. Please correct ...
manidos's user avatar
  • 4,298
3 votes
2 answers
2k views

Ethers js deploy contract with balance, payable constructor

I have a smart contract with a payable constructor. I'm trying to figure out the syntax with ethers js how I can deploy the smart contract and send an initial balance with the deployment. const ...
Brandon's user avatar
  • 31
2 votes
1 answer
1k views

What does etherscan mean by "Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)"?

I'm inspecting a contract on etherscan, at the following URL: https://etherscan.io/address/0x5cb5f46a655c02889172323760d12d0e5d83cdaf#code At the bottom of the web-page, I see two sections: ...
goodvibration's user avatar
2 votes
2 answers
6k views

ethers.js Recover public key from contract deployment via v,r,s values

I'm currently trying to get the public key of the user that deploys a contract. Unfortunately I can't make it work. I am trying to achieve this solely by using ethers.js as I don't want to bloat my ...
Chris's user avatar
  • 1,312
0 votes
1 answer
1k views

Trying to withdraw from contract - Fail with error 'WARNING: not enough ETH for profitable frontrunning. Need at least 1 ETH at present market ...' [duplicate]

Tried to use a standard front running bot but the thing is my eth is still on the contract so I don't think I've been scammed (yet) makes no sense since my eth is still sitting there. this is the code ...
Jason's user avatar
  • 3
23 votes
2 answers
12k views

How to get Source code of an already deployed contract?

How can I retrieve the solidity code of an already published contract in the mist wallet?
tokyomonogatari's user avatar
21 votes
6 answers
33k views

How to find contract's address?

I successfully setup a private blockchain and created the "hello world" contract according to tutorial from etherium web site. One thing that I can't figure out is how to find the contract later. I ...
user3280964's user avatar
17 votes
2 answers
15k views

Canceling / overwriting a pending transaction using geth JSON RPC

This is a private network A transaction was sent to create a contract using the eth_sendTransaction RPC call. The transaction is "removed" marked "will be removed" because it ran out of gas but ...
Bruno Grieder's user avatar
16 votes
9 answers
35k views

Is there a way to extract ABI from a deployed contract?

I am building a web UI for testing smart contracts and currently I have to supply the ABI for a contract I test. Is there a way to extract the ABI from a deployed contract (preferably programmatically)...
Andrey's user avatar
  • 1,147
14 votes
2 answers
1k views

Is there a way to detect which compiler version produced a contract binary?

Given the compiled bytecode on the blockchain, is there a way to detect which compiler version is being used in order to verify source matches bytecode without having to bruteforce all available ...
tayvano's user avatar
  • 16k
13 votes
1 answer
3k views

Out of gas during contract creation

A few days ago, several attempts at creating a contract failed with out of gas errors (confirmed by etherscan/ethercamp and getBalance API), however it is not clear to me what failed exactly, and how ...
fair glu's user avatar
  • 365
13 votes
4 answers
4k views

Deploying a contract from a multisig wallet

I created a multisig wallet using Mist, but don't know how to deploy a contract from the wallet address. Is it even possible? If so, how to do this?
user4866's user avatar
  • 131
13 votes
3 answers
25k views

How to get the contract ABI in new Remix IDE?

Waked up today just to find out the remix browser interface changed to this what happened !!? I cannot find the contract details to get the json interface anymore.
Jose Victor's user avatar
9 votes
3 answers
7k views

Who pays gas for smart contracts?

I'm currently writing my first smart contract and I'm trying to figure out how to inject gas into the contract, of course, if it's possible. I'm not sure If I got it correctly. With every transaction ...
Maarduk's user avatar
  • 375
8 votes
1 answer
2k views

Why does this Oraclize query only works once?

Why this code works one time? First time I get proper random number, but after that I get wallet response "Data can't be executed, so it will use all provided gas" I'm in Testnet. contract ...
Matias's user avatar
  • 1,109
7 votes
3 answers
6k views

How do I determine whether the transaction is used for the contract creation?

I want to monitor Ethereum and memorise every contract published on the blockchain (basically the same thing that Etherscan does). How it is possible to do this using NodeJS & web3? How can I ...
Jack's user avatar
  • 71
6 votes
1 answer
3k views

Initialize state variables in the contract constructor or directly in the declaration?

Is there any difference when initializing variables in the contract constructor or directly in the declaration? What is the best practice? contract A { uint public storage = 10000; constructor(){...
n3n3's user avatar
  • 608
5 votes
5 answers
2k views

Unhandled promise rejection(gas limit) when deploying Contract to rinkeby using truffle-hdwallet-provider

I am trying to Deploy a beginners contract onto the rinkeby test network through Infura node. It is throwing the following error. (node:35183) UnhandledPromiseRejectionWarning: Unhandled promise ...
Finn Rothacker's user avatar
5 votes
1 answer
4k views

How to deploy contract into local running node using solidity browser?

I am running a local ethereum node and I did unlock an account. Now I want to use the solidity browser to deploy that contract, but when I switch to the web3 provider deploy option and I press the ...
sfrj's user avatar
  • 782
5 votes
2 answers
2k views

Can an ENS name point to a contract address?

I know that an ethereum wallet address can have a ENS (Ethereum Name Service) name, but it is possible for a contract? So instead of giving the contract address is it possible to give the contract's ...
Moisés Briseño Estrello's user avatar
5 votes
3 answers
949 views

Do I need to be synced to the blockchain to create a contract?

I haven't been able to run the Greeter contract on the live network and am referring to these excellent Q&As for guidance. I have a feeling that it's because my client hasn't finished syncing with ...
Free Mason's user avatar
5 votes
1 answer
6k views

Deploying contract using byteCode

In that example you can see, how to deploy a new contract having just ABI and ByteCode (uses for copy and deploy contracts from mainnet to your testnet for example). /****** Deploying new contract ...
Vladimir's user avatar
  • 181