“…https://doi.org/10.56578/ijkis020202 At present, the mainstream cross-chain technologies mainly include four methods [4]: hashed time lock contract [5], notary scheme [6,7], sidechain/relays [8], and distributed private key control. Among them, the relay technology is essentially a fusion and extension of the notary scheme and sidechain mechanism [9]. The relay chain is a third-party chain built for the system, which is a channel for cross-chain transactions and data information transmission between various chains.…”