区块结构
type Block struct {
   header       *Header //区块头
   uncles       []*Header    //防止攻击的
   transactions Transactions //交易列表

   // caches
   hash atomic.Value
   size atomic.Value

   // Td is used by package core to store the total difficulty
   // of the chain up to and including the block.
   td *big.Int  // 难度值总和

   // These fields are used by package eth to track
   // inter-peer block relay.
   ReceivedAt   time.Time  // 打包时间
   ReceivedFrom interface{}
}

头结构

type Header struct {
   ParentHash  common.Hash    `json:"parentHash"       gencodec:"required"`
   UncleHash   common.Hash    `json:"sha3Uncles"       gencodec:"required"`
   Coinbase    common.Address `json:"miner"            gencodec:"required"`
   Root        common.Hash    `json:"stateRoot"        gencodec:"required"`
   TxHash      common.Hash    `json:"transactionsRoot" gencodec:"required"`
   ReceiptHash common.Hash    `json:"receiptsRoot"     gencodec:"required"`
   Bloom       Bloom          `json:"logsBloom"        gencodec:"required"`
   Difficulty  *big.Int       `json:"difficulty"       gencodec:"required"`
   Number      *big.Int       `json:"number"           gencodec:"required"`//区块高度
   GasLimit    uint64         `json:"gasLimit"         gencodec:"required"`
   GasUsed     uint64         `json:"gasUsed"          gencodec:"required"`
   Time        *big.Int       `json:"timestamp"        gencodec:"required"`
   Extra       []byte         `json:"extraData"        gencodec:"required"`
   MixDigest   common.Hash    `json:"mixHash"`
   Nonce       BlockNonce     `json:"nonce"`
}

新建区块方法

// NewBlock creates a new block. The input data is copied,
// changes to header and to the field values will not affect the
// block.
//
// The values of TxHash, UncleHash, ReceiptHash and Bloom in header
// are ignored and set to values derived from the given txs, uncles
// and receipts.
func NewBlock(header *Header, txs []*Transaction, uncles []*Header, receipts []*Receipt) *Block {
   b := &Block{header: CopyHeader(header), td: new(big.Int)}

   // TODO: panic if len(txs) != len(receipts)
   if len(txs) == 0 {
      b.header.TxHash = EmptyRootHash
   } else {
      b.header.TxHash = DeriveSha(Transactions(txs))
      b.transactions = make(Transactions, len(txs))
      copy(b.transactions, txs)
   }

   if len(receipts) == 0 {
      b.header.ReceiptHash = EmptyRootHash
   } else {
      b.header.ReceiptHash = DeriveSha(Receipts(receipts))
      b.header.Bloom = CreateBloom(receipts)
   }

   if len(uncles) == 0 {
      b.header.UncleHash = EmptyUncleHash
   } else {
      b.header.UncleHash = CalcUncleHash(uncles)
      b.uncles = make([]*Header, len(uncles))
      for i := range uncles {
         b.uncles[i] = CopyHeader(uncles[i])
      }
   }

   return b
}