Echo bypass trusted issues by restaking the staked BTC (Hash-Timelock in Bitcoin Layer-1 is highly reliable) instead of directly bridging BTC. We also build a decentralized, community-based Echo relayer to bridge BTC LST to Aptos to maintain security and integrity throughout the briding process. This relies on validators and submitters who will be responsible for monitoring and verifying deposit withdrawal events on the blockchain. If any validator acts maliciously, submitters can report and initiate process to block these validators.