thumb|Mechanical typewriters, such as this 1930s Underwood, were long-time standards in government agencies, newsrooms, and offices. thumb|This late 1960s Olivetti Valentine typewriter designed by Ett
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 0x937ba7c35f00c816312b1ec7e9870c8cc358ae388f8e025ae9ef0494e3392615. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/393191e0-b130-47c0-90ae-c902f06ac693.json and https://artists.proofprofile.net/proofs/artist/393191e0-b130-47c0-90ae-c902f06ac693.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).