Even if you Object.freeze the verified event, nothing in JS will stop you from destructuring it into a new object like that. verify can be a function on the prototype but nothing can guarantee *its* immutability.
The implementation must follow the nip46 signer protocol, right? https://nostr-nips.com/nip-46#signer-protocol
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The event signature is described in NIP-01. 46 is a spec for external signing providers on top of that format. Code interfaces into verification are completely up to implementors.
