CB4 is a 1993 American satirical mockumentary black comedy film directed by Tamra Davis and starring Chris Rock. The film follows a fictional rap group named "CB4", named after the prison block in whi
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4e765e63acbfb077fa34a3718f9881190922131e7af525c3e2956fb2ccb52e. 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/8972a6ab-1d97-4372-acc3-738cbee415dd.json and https://artists.proofprofile.net/proofs/artist/8972a6ab-1d97-4372-acc3-738cbee415dd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).