7P may refer to: 7P 7P/Pons-Winnecke, comet Batavia Air, IATA-Code, Indonesian Airline 7p, an arm of Chromosome 7 (human) 7P, a Classification of steam locomotives by British Railways, denoting a
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 0x2630c2a7e1e465dc50d7bde0e407738e8f5649dc1d9357fddb80c3217d13a1b5. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9be5b44-919c-4941-a390-65ff05a828c9.json and https://artists.proofprofile.net/proofs/artist/e9be5b44-919c-4941-a390-65ff05a828c9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).