Library for accessing block hashes way beyond the 256-block limit.

struct ShortHeader {
    bytes32 parentHash;
    bytes32 stateRoot;
    bytes32 transactionsRoot;
    bytes32 receiptsRoot;
    bytes32[8] logsBloom;
}

Ethereum block header fields relevant to historical MPT proofs.

error BlockHashMismatch()

The keccak256 of the RLP-encoded block header does not equal to the block hash.

error InvalidBlockHeaderEncoding()

The block header is not properly RLP-encoded.

address internal constant HISTORY_STORAGE_ADDRESS =
    0x0000F90827F1C53a10cb7A02335B175320002935

Address of the EIP-2935 history storage contract.
See: https://eips.ethereum.org/EIPS/eip-2935

function blockHash(uint256 blockNumber)
    internal
    view
    returns (bytes32 result)

Retrieves the block hash for any historical block within the supported range.
The function gracefully handles future blocks and blocks beyond the history window by returning zero,
consistent with the EVM's native BLOCKHASH behavior.

function verifyBlock(bytes calldata encodedHeader, uint256 blockNumber)
    internal
    view
    returns (bytes32 result)

Reverts if keccak256(encodedHeader) != blockHash(blockNumber),
where encodedHeader is a RLP-encoded block header.
Else, returns blockHash(blockNumber).

function toShortHeader(bytes calldata encodedHeader)
    internal
    pure
    returns (ShortHeader memory result)

Retrieves the most relevant fields for MPT proofs from an RLP-encoded block header.
Leading fields are always present and have fixed offsets and lengths.
This function efficiently extracts the fields without full RLP decoding.
For the specification of field order and lengths, please refer to
prefix. 6 of the Ethereum Yellow Paper:
(https://ethereum.github.io/yellowpaper/paper.pdf)
and the Ethereum Wiki (https://epf.wiki/#/wiki/EL/RLP).