Interchain Timestamping for Mesh Security - Ertem Nusret Tas

Описание: Ertem Nusret Tas (Stanford University), David Tse (Stanford University), Fisher Yu (BabylonChain), Runchao Han (BabylonChain), Kamilla Nazirkhanova (Stanford University)

Fourteen years after the invention of Bitcoin, there has been a proliferation of many permissionless blockchains. Each such chain provides a public ledger that can be written to and read from by anyone. In this multi-chain world, a natural question arises: what is the optimal security an existing blockchain, a consumer chain, can extract by only reading and writing to k other existing blockchains, the producer chains? We show that a simple protocol, called interchain timestamping, where each chain, starting from the consumer chain, timestamps its transactions to the next chain in sequence, can extract the maximum economic security from the parent chains, as quantified by the slashable safety resilience. We observe that interchain timestamps are already provided by light-client based bridges, so interchain timestamping can be readily implemented for Cosmos chains connected by the Inter-Blockchain Communication (IBC) protocol. We compare interchain timestamping with recently proposed security sharing solutions such as Trustboost and cross-staking.

ConsensusDays 23 Session 1.3- Decentralisation and Checkpointing
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