database

type Database interface {
	// Reader returns a node reader associated with the specific state.
	// An error will be returned if the specified state is not available.
	Reader(stateRoot common.Hash) (Reader, error)
}

type Reader interface {
	// Node retrieves the trie node blob with the provided trie identifier,
	// node path and the corresponding node hash. No error will be returned
	// if the node is not found.
	//
	// Don't modify the returned byte slice since it's not deep-copied and
	// still be referenced by database.
	Node(owner common.Hash, path []byte, hash common.Hash) ([]byte, error)
}