The two major changes are the introduction of the Merkelized Abstract Syntax Tree (MAST) and Schnorr Signature. MAST introduces a condition allowing the sender and recipient of a transaction to sign D'avanguardia on its settlement together. Schnorr Signature allows users to aggregate several signatures into one for a single transaction. https://webookmarks.com/story13080507/a-proposito-di-fatti-bitcoin-revealed