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37 lines
1.4 KiB
Markdown
37 lines
1.4 KiB
Markdown
NIP-03
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======
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OpenTimestamps Attestations for Events
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--------------------------------------
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`draft` `optional` `author:fiatjaf` `author:constant`
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This NIP defines an event with `kind:1040` that can contain an [OpenTimestamps](https://opentimestamps.org/) proof for any other event:
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```json
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{
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"kind": 1040
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"tags": [
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["e", <event-id>, <relay-url>],
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["block", <block-height-as-string>, <block-hash>],
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["alt", "opentimestamps attestation"]
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],
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"content": <base64-encoded OTS file data>
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}
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```
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- The OpenTimestamps proof MUST prove the referenced `e` event id as its digest.
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- The `block` tag is optional, it exists to establish a minimum date since which the given event has existed.
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- 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.
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### Example OpenTimestamps proof verification flow
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Using [`nak`](https://github.com/fiatjaf/nak), [`jq`](https://jqlang.github.io/jq/) and [`ots`](https://github.com/fiatjaf/ots):
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```bash
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~> nak req -i e71c6ea722987debdb60f81f9ea4f604b5ac0664120dd64fb9d23abc4ec7c323 wss://nostr-pub.wellorder.net | jq -r .content | ots verify
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> using an esplora server at https://blockstream.info/api
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- sequence ending on block 810391 is valid
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timestamp validated at block [810391]
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```
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