miner-dapp-wasm/blockchain/block/hashValid

block.go

func (blk *Block) hashValid() bool {
	hash := blk.hash
	// put in mind Little Endian
	// converting the 8 most significant bytes of hash to one number int
	hashAsInt := uint64(0)
	for i := uint8(1); i <= uint8(8); i++ {
		hashAsInt = uint64(hash[32-i])<<((8-i)*8) + hashAsInt
	}
	diff := (uint64(1)<<63)>>(blk.difficulty-1) - 1
	return hashAsInt <= diff
}