Well, https://github.com/nostr-protocol/nostr/issues/45#issuecomment-1362102659

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AWesome thread! I like your direction and love to see it!

I noticed the time stamp, it seems like the discussion has become ID at time. Why not use bitcoin block height for universal time instead of time stamp.

they could, but I think it is too much change (you now need a node) at a short time