I'm thinking about the evolution of truly decentralized custody under $BTC and exploring various business opportunities: The fundamental difference between $BTC and projects like $ETH is the effectiveness of user private key asset ownership. Assets on $BTC are 100% owned by the user's private key, whereas projects like Ethereum ($ETH) are more like the Federal Reserve, where privileged institutional alliances can always bypass the user's private key permissions to intervene in their assets. On $BTC, assets cannot be interfered with by anyone or any institution other than the private key holder. However, $ETH and similar assets exist on a specific world state tree, where algorithmic consensus can bypass the user's private key to directly modify account assets and other data. It's just that, like centralized exchanges, the credit driven by interests leads to rights not being easily used to modify user account assets and other data. Decentralized custody business lines can restart multiple business chains and seamlessly integrate with the current $BTC UTXO, running in parallel. Then, abstract different Bitcoin longest chains by only changing two aspects: 1. Changing the business (not limited to currency transfers). 2. Changing to a cleaner, lightweight consensus without double hashing (while strictly adhering to decentralized rules, meaning 100% private key control over account permissions).