Add "shared" user ID type #5
Onionr cannot do forward secrecy when a key is shared across multiple devices (either by the same user or multiple users). In order to disable forward secrecy with a user ID, Onionr could generate keys starting with a specific byte or two.
- Identify the byte length to start with and what they should be
- Implement logic to find vanity keys with multiprocessing
- Implement logic to ensure that non-shared keys are not incidentally generated with these bytes
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