Design of the Secure Smart Home System Based on the Blockchain and Cloud Service

Table 1

Block header attributes.

Block header attribute	Definition
Version number	Used to indicate which set of block validation rules to follow
Parent block hash	256-bit hash value pointing to the previous block
Merkle root hash	Hash value of all transactions in the block
Time stamp	The current timestamp is from 1970-01-01T00: 00UTC seconds
nBits	Target value corresponding to mining difficulty
Random number	A 4-byte field, usually starting from 0, is incremented by each hash calculation