# Block

VeChainThor defines a block (opens new window) in Golang as:

// block.go

type Block struct {
	header *Header
	txs    tx.Transactions

type Header struct {
	body headerBody

type headerBody struct {
	ParentID    thor.Bytes32
	Timestamp   uint64
	GasLimit    uint64
	Beneficiary thor.Address

	GasUsed    uint64
	TotalScore uint64

	TxsRoot      thor.Bytes32
	StateRoot    thor.Bytes32
	ReceiptsRoot thor.Bytes32

	Signature []byte

type Transactions []*Transaction

where ParentID is the ID of the parent block, Beneficiary is the address assigned by the block generator to receive reward (in VTHO), and TotalScore is the accumulated witness number of the chain branch headed by the block. We will describe what the score means when describing the Proof of Authority consensus algorithm.

Let denote headerBody. The block ID (thor.Bytes32) can be computed as:

where is the block number stored as a uint32 and the operation that discards the first four bytes.