NIP-3

NIP-3 enables OpenTimestamps integration for events, providing a method to verify the age of an event in the NOSTR protocol.

NIP-3 introduces the integration of OpenTimestamps attestations for events in the NOSTR protocol. When an OpenTimestamps attestation (OTS) is available, it can be included in the event body under the "ots" key as a base64-encoded OTS file data. The event ID must be used as the raw hash to be included in the OpenTimestamps Merkle tree. Attestations can be provided by either relays automatically (appending the OTS binary contents to the received events) or by clients themselves when uploading the event to relays, and can be used to show that an event is verifiably at least as old as the OTS date.