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 That wouldn’t work; you need anchoring to something that can’t be trivially reordered. I am proposing to use NIP-03 stamping for event ordering. 
 D’oh! 
I guess I’m not technically competent enough to know that you’d be able to reorder what was previously published on others relays. I didn’t think fully deleting or changing past notes was fully possible on this protocol. 

Is that even true if I ran my own relay? 
 Completely true 
 ⚡️ 
 Same, confused about relays

Want good relays 
 Then you could hash everyone’s backup npub using a merkle tree and publish the final/top level hash to the Bitcoin blockchain a la open timestamps?