BlockHeader

import * as BlockHeader from '@voltaire/primitives/BlockHeader'

const header = BlockHeader.from({
  parentHash: "0x...",
  ommersHash: "0x...",
  beneficiary: "0x...",
  stateRoot: "0x...",
  transactionsRoot: "0x...",
  receiptsRoot: "0x...",
  logsBloom: new Uint8Array(256),
  difficulty: 0n,
  number: 18000000n,
  gasLimit: 30000000n,
  gasUsed: 15000000n,
  timestamp: 1700000000n,
  extraData: new Uint8Array(0),
  mixHash: "0x...",
  nonce: new Uint8Array(8),
  baseFeePerGas: 30000000000n,
})

type BlockHeaderType = {
  readonly parentHash: BlockHashType
  readonly ommersHash: HashType
  readonly beneficiary: AddressType
  readonly stateRoot: HashType
  readonly transactionsRoot: HashType
  readonly receiptsRoot: HashType
  readonly logsBloom: Uint8Array         // 256 bytes
  readonly difficulty: Uint256Type
  readonly number: BlockNumberType
  readonly gasLimit: Uint256Type
  readonly gasUsed: Uint256Type
  readonly timestamp: Uint256Type
  readonly extraData: Uint8Array         // max 32 bytes
  readonly mixHash: HashType
  readonly nonce: Uint8Array             // 8 bytes
  readonly baseFeePerGas?: Uint256Type   // EIP-1559 (London)
  readonly withdrawalsRoot?: HashType    // Shanghai
  readonly blobGasUsed?: Uint256Type     // EIP-4844 (Cancun)
  readonly excessBlobGas?: Uint256Type   // EIP-4844 (Cancun)
  readonly parentBeaconBlockRoot?: HashType // EIP-4788 (Cancun)
}

const header = BlockHeader.from({
  // Required fields (all blocks)
  parentHash: "0x1234...",
  ommersHash: "0x1dcc...", // Usually empty hash post-merge
  beneficiary: "0xfee...",  // Fee recipient
  stateRoot: "0xabcd...",
  transactionsRoot: "0xef01...",
  receiptsRoot: "0x2345...",
  logsBloom: new Uint8Array(256),
  difficulty: 0n,          // 0 post-merge
  number: 18500000n,
  gasLimit: 30000000n,
  gasUsed: 12345678n,
  timestamp: 1700000000n,
  extraData: new Uint8Array(0),
  mixHash: "0x0000...",    // 0 post-merge
  nonce: new Uint8Array(8), // 0 post-merge

  // EIP-1559 (London fork)
  baseFeePerGas: 30000000000n,

  // Shanghai fork
  withdrawalsRoot: "0x5678...",

  // EIP-4844 (Cancun fork)
  blobGasUsed: 262144n,
  excessBlobGas: 0n,
  parentBeaconBlockRoot: "0x9abc...",
})

const postMergeHeader = BlockHeader.from({
  // ...other fields
  difficulty: 0n,               // Always 0
  mixHash: "0x" + "00".repeat(32), // RANDAO reveal
  nonce: new Uint8Array(8),     // Always 0
})