C1, C01, C.I or C-1 may refer to: Arts and media C1, a note-octave in music C1 Television, a Mongolian television channel Cinema One, Philippine pay TV channel Schecter C-1 Hellraiser FR, a guita
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 0xf250c7eaa1f2586cebea8e00163447fe0945a1de1b5b74c9d01da7ffe585872d. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2e1674d3-3715-4ca4-84d8-6d8f020c7915.json and https://artists.proofprofile.net/proofs/artist/2e1674d3-3715-4ca4-84d8-6d8f020c7915.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).