CZ, C-Z, C/Z, or Cz may refer to: Places Czech Republic (ISO 3166 country code CZ) .cz, internet country code top-level domain for the Czech Republic Casa Zimbabwe, a student housing unit in Berke
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 0xf0994025bf2fa40aa117909d87d9accdeaa326a77f16851f09f518e7cc57e865. Chain 2 (Bitcoin): anchored in block 953888 (2026-06-16T04:55:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0dec5076-29c0-43b0-809a-278d4e5587fa.json and https://artists.proofprofile.net/proofs/artist/0dec5076-29c0-43b0-809a-278d4e5587fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).