thumb|Depiction of harvesting in the August calendar page of the Queen Mary Psalter (fol. 78v), ca. 1310 thumb |In recent decades, the number of warm temperature records in August has outpaced cold te
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 0xd2771fd7f5237a112ef9798cd7260081750b12dfb5d9da4e0291e34fae7aed37. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3c1ba08-8a44-4f6b-be50-9307537ea032.json and https://artists.proofprofile.net/proofs/artist/a3c1ba08-8a44-4f6b-be50-9307537ea032.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).