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 0x50539f1a1417b091a127fa892c872a650509ef0ba710703dea86855254259ab5. 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/cce2271d-09d3-418f-b15f-5331a51edb99.json and https://artists.proofprofile.net/proofs/artist/cce2271d-09d3-418f-b15f-5331a51edb99.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 #03 松岡 凛 (CV.宮野真守)「Break our balance」
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 0x12e0417e0dcf08fad1d5b1f953faef324048ad7f42fdb47f32ecb75fedb4fdf5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPI101301780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd005486600b7bf7ea77980a95c4032b11b6a94b7bc7225113f327b07de59ae94. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/JPI101301781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e0417e0dcf08fad1d5b1f953faef324048ad7f42fdb47f32ecb75fedb4fdf5. 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/JPI101301780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd005486600b7bf7ea77980a95c4032b11b6a94b7bc7225113f327b07de59ae94. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T16:02:34Z), 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/JPI101301781.
TVアニメ『Free!』キャラクターソング デュエットシリーズ 003
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31cebe489143c194b5bfe354006235aa0be05f10c532bfb9fe6e9af5e45c649. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T08:54:05Z), 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/JPI101400052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31cebe489143c194b5bfe354006235aa0be05f10c532bfb9fe6e9af5e45c649. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPI101400052.
TVアニメ『Free!-Eternal Summer-』キャラクターソング03 松岡 凛 (CV.宮野真守)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e15548d89a8199c00c2a550f998aae6d5efcae7392eea5d32e4a12e4756857. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T02:24:36Z), 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/JPI101401760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e15548d89a8199c00c2a550f998aae6d5efcae7392eea5d32e4a12e4756857. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/JPI101401760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3401b0b2eba149f58f8b992e3cc5ce889102bc47b815b9e206e2d472d9c06d1c. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T05:24:37Z), 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/JPI101401761.
『劇場版 Free!-the Final Stroke-』キャラクターソングシングル Vol.8 松岡 凛 (CV.宮野真守)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb94c73b8fef5d1e89b06988450827f001f2b3025b34c1c5411bf3987cf9ccdb. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/JPI102201931.
『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 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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30b8cc57af91a70dd39e3631aa6fb68f559646b4fffd81c89d51a54214faf18. Chain 2 (Bitcoin): anchored in block 957012 (2026-07-21T21:35:00Z), 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.
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 0x1afb4f5a8247a714b071c70034decbf378e44f1e0a4e6b0593584c0d536aec47. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/JPI101802558.
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 0xcf18d824bc281e631b587c93a6cda5cbb32ef1106fbe415492190df5d0f7d369. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPI101401757.