thumb|Trophy depicting a dandan at MagicCon: Chicago in 2025 A dandan or dendan is a mythical sea creature from The Book of One Thousand and One Nights (or Arabian Nights) appearing in the tale "Abdu
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 0x92f12eb38d1b1cfb6c1689b9ab188deae889fb6fcd83b5730f4d1cab3fcf70b1. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8070792-5d3d-486e-b121-6e3b4e16a342.json and https://artists.proofprofile.net/proofs/artist/d8070792-5d3d-486e-b121-6e3b4e16a342.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).