Accounts and State

Accounts

Same as Ethereum, Scroll has two account types: Externally-owned account (EOA) and contract account that holds the smart contract and additional storage.

The account structure in Scroll follows the standard Ethereum format:

• nonce: A counter that indicates the number of transactions sent by the sender.
• balance: The balance of ETH token in the account (unit in wei).
• storageRoot: The root hash of the storage trie.
• codeHash: The Keccak hash digest of the contract bytecode.

State

The state of a blockchain is a collection of account data. The state trie encodes account data and their corresponding addresses to a Merkle tree data structure. The root of tree, or the state of the blockchain, is a cryptographic digest of all the account data contained in the tree.

Scroll uses Ethereum’s Merkle-Patricia Trie (MPT) for both the state trie and the storage trie that stores the key-value entries in smart contracts. This ensures full compatibility with Ethereum’s state proof format and tooling.