When making forks (alpha, beta, delta) they presumably have the same Ego Id and nanotat as the original (at least in the Planetary Consortium (Mars), but with a sub-id.
I think the nanotat validity depends on the issuer and their authority, but it would make sense if this is chained back to previous issuers when an ego was previously sleeved, egocast, etc. a bit like bitcoin transactions. All encrypted. Thus continuing this thought the further you trace the chain by verifying a nanotat chain with multiple issuing authorities the more assured you can be that it is genuine.
With fake ego Ids you can create a fake chain (just buy some Ids from a corrupt official, lax hab, etc.), but in the case of an existing ego Id (i.e. copying a nanotat) it would have to be accepted up the chain or immediately be discovered as an unauthorised copy at even a cursory identity check. Presumably the whole ego Id and nanotat system relies on this.
Am I thinking right here? Am I missing something? If so every fork that needs a nanotat (legally required in PC territories) must get permission to make the fork and presumably each fork must be given its own sub-Id. This also makes it trivially easy to enforce fork laws and issue fines if forks are not merged/terminated in the required timeframe. It also means that black clinics cannot make legal forks, only forks with fake Ids. These will work fine (although quality and thus "suspicion rating" will vary) until they do something suspect or try to enter high security areas and are submitted to a brainscan, but will not grant them access to the original's rep/accounts/etc.
I'm trying to understand how to handle Ego Ids in my own heavily modified Ego Hunter scenario. I have several alpha and beta forks running around and I'm trying to understand what their Ego Ids must be, what nanotats they might have, their legal status and how easy it might be for them to travel, use rep, etc.
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Transhuman Mind