OBJECT
Corresponds to Tezos RPC -> $block_header.alpha.full_header.
$block_header.alpha.full_header
type DoubleBakingEvidenceBlockHeader {level: Int! proto: Int! predecessor: BlockHash! timestamp: DateTime! validation_pass: Int! operations_hash: OperationHash fitness: [String!]! context: ContextHash! priority: Int! proof_of_work_nonce: String seed_nonce_hash: NonceHash signature: Signature! }