For externally owned accounts, the codeHash field is the hash of an empty string.
ETHEREUM WALLET CONTRACT CODE
All such code fragments are contained in the state database under their corresponding hashes for later retrieval.
It cannot be changed, unlike the other account fields. This EVM code gets executed if the account gets a message call. Contract accounts have code fragments programmed in that can perform different operations.
codeHash – This hash refers to the code of an account on the Ethereum virtual machine (EVM). Wei is a denomination of ETH and there are 1e+18 wei per ETH. balance – The number of wei owned by this address. In a contract account, this number represents the number of contracts created by the account. This ensures transactions are only processed once. 
nonce – A counter that indicates the number of transactions sent from the account. Transactions from an external account to a contract account can trigger code which can execute many different actions, such as transferring tokens or even creating a new contract. Can only send transactions in response to receiving a transaction. Creating a contract has a cost because you're using network storage. Transactions between externally-owned accounts can only be ETH/token transfers. Contract – a smart contract deployed to the network, controlled by code. Externally-owned – controlled by anyone with the private keys. But to help you better understand this page, we recommend you first read through our introduction to Ethereum. PrerequisitesĪccounts are a very beginner-friendly topic. Accounts can be user-controlled or deployed as smart contracts. An Ethereum account is an entity with an ether (ETH) balance that can send transactions on Ethereum.
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