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 0x1eb186406407c90a4e379eb465873fcc2249e23bfcf1fa2bb4869f3d1f903a43. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fbeaa2f6-849c-4f0d-a426-6397dd028c65.json and https://artists.proofprofile.net/proofs/artist/fbeaa2f6-849c-4f0d-a426-6397dd028c65.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
かけざん九九7の段「すいかの名産地」
Kakezan KuKu San No Dan Arupusuichimanjaku
Kakezan KuKu Shichi No Dan Suikanomeisanchi
かけざん九九8の段「線路は続くよどこまでも」
Kakezan KuKu Hachi No Dan Senrohatsuzukuyodokomademo
かけざん九九3の段「アルプス一万尺」
かけざん九九9の段「むすんでひらいて」