Yesterday, my NFT was stolen. The NFT that I spent all my money to buy, the NFT that can give me a bright future, was stolen. This isn't the first time I've been robbed.

So this made me take another look at WEB3. This time the theft was due to the leak of the private key.

Yes, in the blockchain world, private keys are everything. It is the highest authority, and the only thing that can reduce its importance is multisig.

But for ordinary users, multi-signing is a high threshold and difficult to complete. So, is there a tool that can "lock" your wallet?

This "lock" does not review incoming assets, but only reviews assets when they flow out. It can be a secondary password, or a fingerprint verification. This "lock" must follow the address, not a single wallet. As you can imagine, even if the thief logs in to the wallet with the private key from another place, the "lock" existing in the address is still in effect. It may be able to steal your private key, but it cannot steal your secondary password or physical characteristics.

Is this "lock" technically difficult to implement?