[xorcist]

No, policy changes makes for a new blockchain. That's what usually referred to as a "hard fork", as opposed to a "soft fork" where consensus rules are only allowed to get stricter, exactly beacuse ownership of a coin should be guaranteed forever.

You could follow the consensus rules set out from the beginning and you would still end up on today's majority chain.

I believe there were a couple of early bug fixes along the way, which makes this not strictly true. As in the original first release of the software not actually capable of downloading all of the chain, which some people love to point to as a proof of it being a fallible system. This is probably true but doesn't really detract from the original point of guaranteed ownership by never relaxing the consensus rules.