[AIP-79][Discussion] Implementation of instant on-chain randomness

[thepomeranian]

AIP Discussion

This AIP describes the implementation of the randomness API from AIP-411 on top of Aptos blockchain, which is to provide Move smart contracts with access to (1) instant, (2) unbiasable and (3) unpredictable randomness under the proof-of-stake assumption that secures the blockchain itself. The implementation should also be efficient, i.e., negligible impact to the throughput or latency of the blockchain system. The AIP will focus on the on-chain randomness protocol description and implementation, and the efficient blockchain system integrations. Specifically, we describe how we implement a weighted distributed key generation (DKG) protocol in a PoS setting to set up threshold keys among the validators, and have validators generate randomness every block using their keys and a weighted verifiable unpredictable function (VUF). We will also describe other major system changes such as reconfiguration changes and Aptos VM changes.

Read more about it here: https://github.com/aptos-foundation/AIPs/blob/main/aips/aip-79.md

[ghost]

Could i ask an stupid question would you mind? is every block transaction are confirmed in certain time and period that precious to microsecond?

[danielxiangzl]

Could i ask an stupid question would you mind? is every block transaction are confirmed in certain time and period that precious to microsecond?

Each block has a timestamp in microsecond, determined by the block proposer. Every validators agree on the timestamp since they agree on the block, but they may commit the block at different physical time points since the system is decentralized.