SPC may refer to: Business and law Segregated portfolio company, a specialized form of offshore company Signature panel code, a credit or debit card security code Social purpose corporation, a com
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 0x56b87938e080cc3a640fcdb13d39d886dcdedffb567c6b57e293d1d4af0e8f6d. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d6de2fe7-d023-4344-be52-e8edc3eae264.json and https://artists.proofprofile.net/proofs/artist/d6de2fe7-d023-4344-be52-e8edc3eae264.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).