P7, P.7, or P-7 may refer to: Aircraft Boeing XP-7, a prototype United States biplane fighter of the 1920s Lockheed P-7, a proposed patrol aircraft ordered by the U.S. Navy Piaggio P.7, an Italian
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdd42c62f07531f216a54656f3d33cb322923fb3bf00100ba196e652d876318. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/712aedaf-d8fb-4ce8-9e45-06a03252e22a.json and https://artists.proofprofile.net/proofs/artist/712aedaf-d8fb-4ce8-9e45-06a03252e22a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).