Blockchain Properties and Structure Linked list of blocks Each block contains a pointer to the previous block plus a hash of the previous block Except,of course,for the first block,called the genesis block Tamper resistance The inclusion of the hash of the previous block makes tampering difficult Changing the contents of a block means changes all newer blocks as well Specific mathematical requirements for the hash function (see later) Replication prevents replacement of the entire blockchain without gaining majority control Database System Concepts-7th Edition 26.5 ©Silberscha乜，Korth and SudarshanDatabase System Concepts - 7 26.5 ©Silberschatz, Korth and Sudarshan th Edition Blockchain Properties and Structure ▪ Linked list of blocks • Each block contains a pointer to the previous block plus a hash of the previous block ▪ Except, of course, for the first block, called the genesis block ▪ Tamper resistance • The inclusion of the hash of the previous block makes tampering difficult ▪ Changing the contents of a block means changes all newer blocks as well • Specific mathematical requirements for the hash function (see later) • Replication prevents replacement of the entire blockchain without gaining majority control