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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e14c40616f7bb1c6e1f7e515ebf9791d83a8c907893a5c60e90b9e697cbfdf3. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9888332-513b-4dec-afe6-92dbcd0a0666.json and https://artists.proofprofile.net/proofs/artist/a9888332-513b-4dec-afe6-92dbcd0a0666.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Eiyuu Unmei no Uta (cover ver.) [feat. Yuzuki Yukari]
Eiyu Fate's Song (cover ver.) [feat. Eleanor Forte]
I beg you (cover ver.) [feat. Yuzuki Yukari]
HARU WA YUKU (cover ver.) [feat. Yuzuki Yukari]
theater D (cover ver.) [feat. MEIKA Hime & Mikoto]
Homura (feat. Yuzuki Yukari) [cover ver.]
The Everlasting Guilty Crown (feat. Koharu Rikka) [cover ver.]
Umapyoi Densetsu (feat. Koharu Rikka) [cover ver.]
Sangenshoku (feat. Koharu Rikka) [cover ver.]
Ai no Supreme! (feat. Koharu Rikka) [cover ver.]
Taishō Roman (feat. Koharu Rikka) [cover ver.]
MIXED NUTS (feat. Koharu Rikka) [cover ver.]
Tower of Flower (feat. Koharu Rikka) [Cover]
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a429ba9d929d0dc87e826bea465a7acfd3ad0dd5bd905f62bf152dd1c19e9f. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPS2299582 — a six-check JSON result.
The Blessing (feat. Koharu Rikka) [Cover]
S'il vous President (feat. Natsuki Karin) [Cover]
Kyu-Kurarin (feat. Hanakuma Chifuyu) [Cover]
(Not) A Devil [feat. Natsuki Karin] [Cover]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d664f1f3ba79c2d8f40f2561696825196066594f99704497eb0dbc19fc4f93. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPV2305649 — a six-check JSON result.
Cat Loving (feat. Hanakuma Chifuyu) [Cover]
CENDRILLON (feat. Natsuki Karin & Koharu Rikka) [Cover]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96218763adfb9331978c01df8aa022171d686707069950f9f862dc3858b74bb. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPV2367818 — a six-check JSON result.
Kyofu All Back (feat. KASANE TETO) [Cover]
Marshall Maximizer (feat. Tsurumaki Maki) [Cover]
Ochame Kinou (feat. KASANE TETO) [Cover]
Rabbit Hole (feat. Natsuki Karin) [Cover]
Good-bye Declaration (feat. Natsuki Karin) [Cover]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8354e7e6f8c0c5345406f88e5a95c59766feb0ddd505674a1c5af060068eae. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPX2385481 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e0b1808903653ee9068fadeaa82f03fbda7da47754b417c2686804940dcbc9. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPY2369717 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82eaf2b5f0e566144e539dbdc59bd07e12d0570c3d184974673b3ef758f77f2b. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPZ2463161 — a six-check JSON result.
Kyoufuu All Back (feat. Hanakuma Chifuyu) [Cover]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b59c41afcd656e6b52dca6eb550a006fc2f0fa2e1e4c55a15b365b9612379b. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPA2449612 — a six-check JSON result.
Magical Girl and Chocolate (feat. Natsuki Karin) [Cover]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7338a02d97a1aa7ac8a14edd8eaeb8a493dcecab84e5302a4205571327d8c71. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPB2454578 — a six-check JSON result.
Lower One's Eyes (feat. KASANE TETO) [Cover]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59f8cafe9288b22be2b2149bd9c67519e17cb0127c6dc03e1dee7c6cfd067c2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPA2449613 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266c40912bde9f58dd017f2fa55afd7bdd7924fa377fe7ab0425a06788590aff. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPC2420794 — a six-check JSON result.
why, or why not (feat. Koharu Rikka) [Cover]
S'il vous President (feat. KASANE TETO) [Cover]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb9a98cd5f6bf2d1e46f9bc5eed46e11171130700fd6e5746987e2884482194. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPG2543418 — a six-check JSON result.
Good-bye Declaration (feat. KASANE TETO) [Cover]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec207f4104b6f2735db81520ca3a1ff10426e80e7741af8ebf8397e6c9b64f2a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPI2517397 — a six-check JSON result.
ShukuseiLorikamiRequiem (feat. Ui) [Cover]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20688269ff3e7b40c4712dbc43927e46f865bb11aa766303fb345c7f259d08f3. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPI2582394 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe493e7f635c448eceefa9f2509f7636a442bb7dfbb7d4593ca80abbe0096ceb5. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPJ2519143 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8d911fe7ff26355d987a970f0b82c5001e850fbede470eb5fd0338cc435501. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCJPK2505931 — a six-check JSON result.
Tententengokujigokugoku (feat. HATSUNE MIKU & KASANE TETO) [Cover]
Marshall Maximizer (feat. KASANE TETO) [Cover]