NIP-03 ====== OpenTimestamps Attestations for Events -------------------------------------- `draft` `optional` This NIP defines an event with `kind:1040` that can contain an [OpenTimestamps](https://opentimestamps.org/) proof for any other event: ```json { "kind": 1040 "tags": [ ["e", , ], ["alt", "opentimestamps attestation"] ], "content": } ``` - The OpenTimestamps proof MUST prove the referenced `e` event id as its digest. - The `content` MUST be the full content of an `.ots` file containing at least one Bitcoin attestation. This file SHOULD contain a **single** Bitcoin attestation and no reference to "pending" attestations since they are useless in this context. ### Example OpenTimestamps proof verification flow Using [`nak`](https://github.com/fiatjaf/nak), [`jq`](https://jqlang.github.io/jq/) and [`ots`](https://github.com/fiatjaf/ots): ```bash ~> nak req -i e71c6ea722987debdb60f81f9ea4f604b5ac0664120dd64fb9d23abc4ec7c323 wss://nostr-pub.wellorder.net | jq -r .content | ots verify > using an esplora server at https://blockstream.info/api - sequence ending on block 810391 is valid timestamp validated at block [810391] ```