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 0xe6418c4946adab3040ae3ae7c64e2ea07e18776a940e2736232d480348e8622d. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3729b47-e765-416a-a035-9f54f7303fdb.json and https://artists.proofprofile.net/proofs/artist/d3729b47-e765-416a-a035-9f54f7303fdb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kyosu-kai (feat. HATSUNE MIKU & KASANE TETO)
Kikaijima (feat. Utane Uta & Rei Adachi)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23bfaf9460aecd33fe13e518d0da8e1add68e97bd80c59cd4f4d4c97a63c0271. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T17:06:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPW2360700.
Yurushiteageru (feat. Utane Uta & Kaai Yuki)
sokushimbutsu (feat. HATSUNE MIKU) [2024]
Heat Death (feat. Hanakuma Chifuyu & Kaai Yuki)
Chinka-bashi (feat. KASANE TETO & Hanakuma Chifuyu)
Writer's High (feat. KASANE TETO & Kaai Yuki)
Kikai-jima (2025) [feat. Utane Uta & Rei Adachi]
Spring Equinox (feat. HATSUNE MIKU, Hanakuma Chifuyu & Kaai Yuki)