December is the 12th and final month of the year in the Julian and Gregorian calendars. Its length is 31 days. right|thumb|December, from the Très Riches Heures du duc de Berry thumb |In recent decad
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 0xe8ac6b1515e73976cbb351e9ee58ffa424fef3362157f734f6db0d8b614300a1. 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/32fe0b8b-7bbf-4c5c-a8b9-1f7baa4b383b.json and https://artists.proofprofile.net/proofs/artist/32fe0b8b-7bbf-4c5c-a8b9-1f7baa4b383b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).