Create blockchain V1

The following describes the implementation of blockchain: block. Go

Package mainimport ("time" "crypto/sha256" "bytes ") // define the Block Structure Type Block struct {version int64 prevblockhash [] Byte hash [] Byte timestamp int64 targetbits int64 nonce int64 merkelroot [] byte data [] Byte} // set the block to be created method func newblock (data string, prevblockhash [] Byte) * block {block: = & Block {version: 1, prevblockhash: prevblockhash, // hash: Timestamp: time. now (). unix (), targetbits: 10, Nonce: 5, merkelroot: [] BYT E {}, data: [] Byte (data),} block. sethash () // set the block's hash value return block} // Add the hash value func (Block * block) sethash () {TMP: = [] [] Byte {// inttobyte (Block. version), block. prevblockhash, inttobyte (Block. timestamp), block. merkelroot, inttobyte (Block. nonce), block. data,} // link each field of the block into a slice and use [] Byte {} For the link to avoid the information of the source block data: = bytes. join (TMP, [] Byte {}) // hash the block by sha256. The returned value is a [32] byte array instead of a shard hash: = Sha256.sum256 (data) block. hash = hash [:] // is converted from an array to a shard} // The creation of the Creation block. The hash value of func newgenesisblock () is null for one kubernetes client () * block {return newblock ("Genesis block! ", [] Byte {})}

Blockchain. Go

Package mainimport "OS" // define the blockchain type blockchain struct {blocks [] * block} // create the blockchain and add the creation block func newblockchain () * blockchain {return & blockchain {[] * block {newgenesisblock (), }}// add block func (BC * blockchain) addblock (data string) {// simple validation if Len (BC. blocks) <= 0 {OS. exit (1)} // create a new block named lastblock: = BC. blocks [Len (BC. blocks)-1] prevblockhash: = lastblock. hash block: = newblock (data, prevblockhash) // Add to blockchain BC. blocks = append (BC. blocks, block )}

Utils

package mainimport (    "bytes"    "encoding/binary"    "fmt"    "os")func IntToByte(num int64)[]byte{    var buffer  bytes.Buffer    err := binary.Write(&buffer, binary.BigEndian, num)    //if err != nil{    //  fmt.Println("IntToByte err occur:",err)    //  os.Exit(1)    //}    CheckErr(err)    return buffer.Bytes()}func CheckErr(err error){    if err != nil{        fmt.Println("err occur:",err)        os.Exit(1)    }}

Main. Go

Package mainimport "FMT" func main () {BC: = newblockchain () BC. addblock ("the shift leader transfers a bitcoin to the instructor") BC. addblock ("") for I, block: = range BC. blocks {FMT. println ("=== block num:", I) FMT. printf ("data: % s \ n", block. data) FMT. println ("version:", block. version) FMT. printf ("prevhash: % x \ n", block. version) FMT. printf ("hash: % x \ n", block. timestamp) FMT. printf ("timestamp: % d \ n", block. timestamp) FMT. printf ("Merkel: % x \ n", block. merkelroot) FMT. printf ("nonce: % d \ n", block. nonce )}}

Finally, compile and run the program in the gopath path to view the effect.

Create blockchain V1