These have been debunked to death. * A wallet is just a secret random number, and all the identity-centered uses of it are "classic" cryptography, not needing

These have been debunked to death. * A wallet is just a secret random number, and all the identity-centered uses of it are "classic" cryptography, not needing the double-spend protection. The hard part is in the human side of key management, which blockchains aren't applicable for. Blockchains have no concept of personhood, and can't prevent sockpuppetry. You can only have a plutocracy, not democracy. (Worldcoin has a central authority) * If the blockchain state is final and no central authority is able to override it, then someone can hit you with a pipe until you give your private key, and become legal owner of your house. Police will evict you, coz the blockchain says so. Courts have no authority to reverse it. If you fix this problem, you just have an expensive gov database. Lots of real-world applications can't work because of the oracle problem.