thumbnail|right|A hundi for Rs 2500 of 1951, stamped in the Bombay Province with a pre-printed revenue stamp. A hundi or hundee is a financial instrument that was developed in Medieval India for use i
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 0xa409cadd47ef3f1da792e50e95eee697e459cc45be88210fc6794cc8b4e5206f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/651f05e9-073e-4095-80c5-69713850827a.json and https://artists.proofprofile.net/proofs/artist/651f05e9-073e-4095-80c5-69713850827a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).