Concordium Interoperability SpecificationsΒΆ Protocol Updates Protocol Update 2 - Alpha Centauri 2.0 - Transaction Memos Protocol Update 3 - Alpha Centauri 3.0 - Account Aliases Protocol Update 4 - Sirius - Delegation and new contract state Protocol Update 5 - Smart contract upgradability, performance improvements Standards CIS-0: Standard Detection CIS-1: Concordium Token Standard CIS-2: Concordium Token Standard 2 CIS-3: Sponsored Transaction Standard