Nostr crypto idea: HD chains

Accounts could prove that they were generated by another account.

This could be useful for eg verifying that ActivityPub users bridged to Nostr have been generated by the Mostr Bridge. (Currently NIP-05 is used as proof.)

To do it, we'd generate a master keypair for the bridge. To get the pubkey for an ActivityPub user, we'd sha256 the user's ActivityPub ID, and use that as the chain code in an HD wallet of the master pubkey, then derive index 0.

Bridged accounts would include a "custody" tag, like: ["custody", <master-pubkey>, <chain-code>, <index>]

Clients could verify it by initializing an HD wallet with the chain code, and then deriving the index. If it matches the current event's pubkey, and the event's signature is valid, it proves the account was generated by the master account.

For it to be useful, though, the master pubkey would already have to be trusted by some metric. Either because it's followed, or labeled by a different trusted pubkey somehow, or something else like that.

It could be used for more than just bridged accounts. It could be used for account recover purposes, and more.

As I'm learning about Bitcoin Lightning, I'm seeing some major red flags. To use it, you need an account with a service provider. It's a username/password type of custodial account. Then, the node has full control over your funds. They could shut down without warning, or transfer your funds. The only way to actually have control is to run your own node, but doesn't that defeat the purpose of Lightning? The whole point is to allow many users to transfer tiny amounts of money a lot, eg zaps. To me, it seems that Lightning nodes have all the problems of Mastodon. Imagine the problems of Mastodon, except it's your bank account. That's bad. What am I missing?

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