How To Find Out if an Ethereum Address Is a Contract? - metaschool (2024)

FAQs

How To Find Out if an Ethereum Address Is a Contract? - metaschool? ›

Using code size of the address

The contract address is determined based on the person's address creating the contract (sender) and the number of transactions the creator has sent (nonce). The sender address and nonce are RLP encoded and hashed with the keccak-256 algorithm.

Use an Ethereum Blockchain Explorer: One of the easiest ways to check the owner of an Ethereum address is to use an Ethereum blockchain explorer. Etherscan is a popular blockchain explorer that allows you to search for transactions, addresses, tokens, and other activities taking place on Ethereum.

Go to CoinMarketCap, Coingeeko, or another coin listing website. Enter the token name into the search bar (for example, DAI) Copy the contract address from the “Info” section on your right.

The simplest way to verify your source code is via the Etherscan UI. This process does not require any programming skills. Navigate to the Contract tab of the smart contract you are viewing on Etherscan and click the Verify and Publish link. Then, you'll need to select the file type, compiler version, and license.

If an address is a contract, its code size will be greater than zero, as contracts have bytecode associated with them, whereas EOAs do not. In this contract, the isContract function takes an Ethereum address as an argument and returns true if the address is a contract and false if it's an EOA.

You can use a tool or library to call these functions on the target address. Evaluating Return Values: If the function calls succeed and return valid values (e.g., a non-zero balance or a total token supply), it's a strong indication that you're dealing with an ERC20 token contract.

Ethereum addresses are hexadecimal strings of 40 characters, made up of the letters A–F and the digits 0–9. Ethereum utilizes a checksum mechanism to improve accuracy and lower the possibility of errors during transactions. There are multiple procedures involved in creating an Ethereum address's checksum.

On Ethereum and other networks compatible with the Ethereum Virtual Machine (EVM), public addresses all share the same format: they begin with 0x, and are followed by 40 alphanumeric characters (numerals and letters), adding up to 42 characters in total. They're also not case sensitive.

Smart contract addresses operating on TON typically consist of two main components: (workchain_id): denotes the workchain ID (a signed 32-bit integer) (account_id) denotes the address of the account (64-512 bits, depending on the workchain)

How do I verify my erc20 contract? ›

Verify the smart contract on Etherscan: After deploying the smart contract, you can verify it on Etherscan. To do this, go to the “Contract” tab on Etherscan, enter the contract address, and click “Verify Contract.”

Ethereum addresses are created by taking the Keccak-256 hash of the public key and representing it as a hexadecimal number. The last 20 bytes of the Keccak-256 hash are used to generate the address.

Prefix: All Ethereum addresses start with the prefix "0x." This prefix indicates that the following characters represent a hexadecimal value. Length: An Ethereum address is 42 characters long, including the "0x" prefix. This length remains constant, regardless of the wallet or account's significance.

Ethereum is different. Your wallet address stays the same over time. Your Ethereum wallet address is also the same address for all your ERC-20 tokens and belongs to the same account. This is why you will find the same wallet address for those tokens (like stablecoins).