CBM may refer to: Businesses and corporations Cambrex Corporation (NYSE: CBM) CBM (AM), a radio station in Montreal now known as CBME-FM CBM-FM, a radio station in Montreal CBM TV, a scrapped Fre
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 0x10a88181af702db37023e2708e790cb89c6c8d276de2c51d26e73e56d7f1a29c. 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/5b094e17-6140-4eeb-8685-fc1940144e4a.json and https://artists.proofprofile.net/proofs/artist/5b094e17-6140-4eeb-8685-fc1940144e4a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).