AccountTrieNodeKey test data from https://github.com/ethereum/portal-network-specs/blob/master/state/state-network-test-vectors.md.

AccountTrieNodeWithProof A content value type, used when offering a trie node from the account trie.

ContractBytecodeContainer A content value type, used when retrieving contract's bytecode.

ContractBytecodeWithProof A content value type, used when offering contract's bytecode.

ContractStorageTrieNodeWithProof A content value type, used when offering a trie node from the contract storage trie.

TrieNode A content value type, used when retrieving a trie node.