Attestations allow the signalling of the validity of any other event.

nostr:nevent1qqsrqslwy8fhhs36pa2a7r3edvvxfwwwgsq9tun89ny90477jz057hqpz3mhxw309ucnydewxqhrqt338g6rsd3e9upzp384u7n44r8rdq74988lqcmggww998jjg0rtzfd6dpufrxy9djk8qvzqqqqqqyq46qx0

Now we have the NIP NIP by nostr:nprofile1qqsqgc0uhmxycvm5gwvn944c7yfxnnxm0nyh8tt62zhrvtd3xkj8fhgprdmhxue69uhkwmr9v9ek7mnpw3hhytnyv4mz7un9d3shjqg4waehxw309aex2mrp0yhxgctdw4eju6t09uq3vamnwvaz7tmjv4kxz7fwd4hhxarj9ec82c30hyvdwq clients can effectively ACK/NAK those on a per NIP basis.

Other devs/orgs can attest to the truthfulness/validity of those claims, along the same lines nostr:nprofile1qqsfzm94lura8dguaalkk6ml23umzqqmgqwqaqj43ms6yfgycl2s0jgpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtcuzkyta does.

Attestations all the way down. A WoT for notes.