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I think they were referring to invitation trees like lobste.rs.

• ASalazarMX 5mo ago
  That's for children. Make the Pope a certification authority, and he can certify people he trusts, and so on, until the chain reaches you. When you commit a sin, your certificate gets revoked, along with its children. It would give the web of trust a flair of biblical damnnation, and after your fall you could always seek a new certification authority more aligned with your values, like Milei or Putin. When a world leader dies, the tree pruning would be almost apocaliptic.