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 0x6c4ca81d7978ce052d413bf5c5a822e2bb0f495ad48bfcae39e32bed0331de75. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d53980ee-e86b-46bd-a40a-773ce2a6833b.json and https://artists.proofprofile.net/proofs/artist/d53980ee-e86b-46bd-a40a-773ce2a6833b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
universe (feat. Ohzora Kimishima, Kou Machida, Shuntaro Tanikawa, Yukari Takinami, Moichi Kuwahara, Cirpue du soleike, Haruka & Torii)
universe (feat. 君島大空, 町田康, 谷川俊太郎, 瀧波ユカリ, 桑原茂一, それゆけちゃん, Haruka & 鳥居)