Blockchain Properties and Structure Digital signature Public-key encryption is used to allow users to sign their transactions. Ensures that users cannot deny submitting the transaction,a property called irrefutability. Anonymity Users can remain anonymous unless there is a way to tie the user's ID (public key)to a real-world entity Summary of blockchain properties: Decentralization-majority consensus with no central authority. Tamper resistance-infeasibility of changing the contents of blocks on the blockchain. Irrefutability-user cannot deny having submitted a transaction. Anonymity-IDs not directly tied to any real-world entity Database System Concepts-7th Edition 26.8 ©Silberscha乜，Korth and SudarshanDatabase System Concepts - 7 26.8 ©Silberschatz, Korth and Sudarshan th Edition Blockchain Properties and Structure ▪ Digital signature • Public-key encryption is used to allow users to sign their transactions. • Ensures that users cannot deny submitting the transaction, a property called irrefutability. ▪ Anonymity • Users can remain anonymous unless there is a way to tie the user’s ID (public key) to a real-world entity ▪ Summary of blockchain properties: • Decentralization – majority consensus with no central authority. • Tamper resistance – infeasibility of changing the contents of blocks on the blockchain. • Irrefutability – user cannot deny having submitted a transaction. • Anonymity – IDs not directly tied to any real-world entity