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 0xd97ec6e35c92ec28bea1645299d47b64a1da88d343b95c71119e0e4d09db56f9. 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/15c223a1-0927-4cf4-a401-5454890153b9.json and https://artists.proofprofile.net/proofs/artist/15c223a1-0927-4cf4-a401-5454890153b9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
TVアニメ『Free!』キャラクターソング #01 七瀬 遙 (CV.島﨑信長)「アオノカナタ」
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 0xbb230f9e326f39a5ba6495166ae1f12896511aefe59288628137f9de991956d8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPI101301602.
TVアニメ『Free!』キャラクターソング デュエットシリーズ 001
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b37872461e91846163dd982855487586f0c32ca4c2cfc0f5f18fa434a9e344. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPI101302634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b37872461e91846163dd982855487586f0c32ca4c2cfc0f5f18fa434a9e344. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/JPI101302634.
TVアニメ『Free!』キャラクターソング デュエットシリーズ 004
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b935eb916bfbc984ee7158a3d7afb106d51834be23e6017b38448386f27057e. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T05:47:45Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPI101400269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92cf6d2e342d17303d646077b7ce0376ef1a86a743b6884e54138e45fc70d047. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/JPI101400270.
TVアニメ『Free!-Eternal Summer-』キャラクターソング01 七瀬 遙 (CV.島﨑信長)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b3d5f52b9ff6ba874ef778fadbc2d1b6a19e10b12ae0bb781646ccb48d3f09. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/JPI101401520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed6b6fa85cb26ec1ca9daa80bab84dc02bb1ec5f8974d00d29f952c49cd48622. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:47:26Z), 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/JPI101401521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6439fc9ffac75ab996d93e27e85d5c1fa917b6e48d2d9392b20d634ab5489afe. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/JPI101901242.
『劇場版 Free!-the Final Stroke-』キャラクターソングシングル Vol.1 七瀬 遙 (CV.島﨑信長)
『劇場版 Free!-Road to the World-夢』オリジナルサウンドトラック「Forward Blue Waves」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30b8cc57af91a70dd39e3631aa6fb68f559646b4fffd81c89d51a54214faf18. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/JPI101802340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15911dc93fc6f5a899a99eba9b02fd1d2307b713b593d55d3644eec9ec7387c1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/JPI101401755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30b8cc57af91a70dd39e3631aa6fb68f559646b4fffd81c89d51a54214faf18. Chain 2 (Bitcoin): anchored in block 957012 (2026-07-07T08:27:05Z), 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/JPI101802340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0621ce2e7efad6300a16f8dc2c1855f9719c4c9c0565c626b3efb213dbcb2116. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/JPI101301580.
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 0x9c5835d3c82ee999adf92d7042fd36cc4e01480cc75c3772f184c47c8d2af738. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/JPI101302318.
TVアニメ『Free!-Dive to the Future-』キャラクターソングミニアルバム Vol.1「Seven to High」
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cd3e5efd144a317364c02c8d3dfded7080180fce31faa817619eb663425db9. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/JPI101802564.