Pb is the chemical symbol for the chemical element lead. PB, P.B., or Pb may also refer to: Arts and entertainment Music Paul's Boutique, a 1989 album by American hip-hop group the Beastie Boys Pru
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 0xa7de1b4b7e2ebb4def6bc763cd0c9e13f60b86231c39864c2a162d62e1fb4c56. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/13100d28-02d3-46be-93d8-7b29a83f8e9b.json and https://artists.proofprofile.net/proofs/artist/13100d28-02d3-46be-93d8-7b29a83f8e9b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).