P9 or P-9 may refer to: Planet Nine, a hypothetical new planet in the far outer solar system Boeing XP-9, a prototype fighter aircraft from the 1930s Heckler & Koch P9, a semi-automatic pistol Spr
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 0xfa7f6892808dfd76bc87c556cc01a154dfb0bb6d74632243aa3cd4b3b28e1f54. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8fd3b9b1-d73c-4963-b5b3-a4aa4f3cd713.json and https://artists.proofprofile.net/proofs/artist/8fd3b9b1-d73c-4963-b5b3-a4aa4f3cd713.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).