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 0x04d9c8ebbeea406b4d95f1fbecac34a68ae5749d0467ee6a84c7df3a6369e400. 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/74194685-07e6-4fab-b94f-fb1e1f4d82f8.json and https://artists.proofprofile.net/proofs/artist/74194685-07e6-4fab-b94f-fb1e1f4d82f8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xc993e61b1c2e12f6681e95f60d19e67b26ee344cfaa1d3c7a8b2e310063122bd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPU902001645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94123f2cbaa83f4f1a5a1a99b2361d8cf456563c292d2e722704b8cec49494b2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/JPU902101821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bf061fe3ce10f8bbf9ca5ae58f6496a6f30dbdaeb68b4948cced3a798547d8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/JPU902202669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bcdcdd22925d0ca73f7c76c140a5158be9b7a10c7c6fe5d53e801474378014c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/JPU902104024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042614aefe2cfd95bfce5ba4d938405cc8c312b6f5c6ade677529bb83a2523ed. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/JPU902202670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f4736977ced7d5d9a2e1ba33878441be81d12284c1dce7133e32310ae8aebfc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/JPU902202671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44979abbf5b532315144a2b27f2acb957286ed7c60e415288d0202b8616352f3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/JPU902202672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa7c42d0f7fa7cc5a268f9e63a7be90f62c45fb089d77dbe5d1d3f46f3f427a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/JPU902202673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9b6547a9abcf9da61b59712fda701f1af2c60cb5f4cd4c71724aceeaf5cc88. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/JPU901903295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2ec33d7bdd9bd8f8327d059e1d91f2ebf9be78c76dc9bbe60556d93589546ad. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/JPU902201915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6418bee73f3ee8f54380d0b1b471923d4c333a9b6eb4a8d9f2589dcccc823aa. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/JPU902203502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72d68776be2b5e534f58c20b8889f3c2e44c498fc8477942ce1ed8212d5c364. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/JPU902203895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9d6b8194013c831fca7bd65fa4a1fb9ce07df28ae274b560af6a1e570ef8c0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/JPU902003564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc993e61b1c2e12f6681e95f60d19e67b26ee344cfaa1d3c7a8b2e310063122bd. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/JPU902001645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9b6547a9abcf9da61b59712fda701f1af2c60cb5f4cd4c71724aceeaf5cc88. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/JPU901903295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2496b15ed195379e4002999b14a0b4ba650e029bfce90aeb8eec53e59003ae02. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/JPU901903296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d9a547583858e7c27a56226de74e5e78704e2adee80e23e3bc799b1644678d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/JPU901903297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac62e65252e02721d9de59710ab7cd33e3b4171f4be39d077d1af1cd5cccb5a5. 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/JPU901903298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695a587369ca74c34fa9bec3dc0018396cff209626cb0b5742b667c928a96e89. 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/JPU901903299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0991393f41638f89203f4d2ee12f3b6c92c92a2d79eac928e21d2a164d05fdcb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/JPU901903300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2496b15ed195379e4002999b14a0b4ba650e029bfce90aeb8eec53e59003ae02. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/JPU901903296.
ラストレター オリジナル サウンドトラック
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0135af03cf5560e84b37d87be1220ee7b36e8353f592fc8304a3cd6a1e013dae. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/JPP301900694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe360fafcc921d394b73d573602df1f192e9a1da047d630ad4d1d47f1a98047dd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/JPP301900695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8261ede20b3c62c7079f12bb3643b5e38ba8321b0cdcc7deab92899f77476d16. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/JPP301900696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89d90988d2647e8827ebfc34780c34b844d016e9847f63c4ed52736a3d88883. 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/JPP301900697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc629410e327e88749537e1d996bf5ff1b265a38a1c358c0bc7cda14c98a37b7f. 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/JPP301900698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c6a4b2f060184e37f5f92e058eee4ecfad7c2b4464903871c844093730a749. 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/JPP301900699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee3d5681598d387c0334ce23ce39432c90962edf1e3fa28612dba4619013c61. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/JPP301900700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b334ec7263711d9dbfe2996717fb5dd33f65f4af09887f31c46419244b2482. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/JPP301900701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9040405896282129381bfe7c40098fa92319f9b1ec4544ebeb57fdb857474bb1. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/JPP301900702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c4a3cb729fddf95d2f35c11cc7930c1b4b8d16630f18f70ab210a279216bc5. 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/JPP301900703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76527739f6f3b20a09b25c24e20e5b3fd79ff152a939552718196d870f38edd0. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/JPP301900704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99943568fee8f6f4d25221e9b426edf47cbd5abbb069ea3d52cac9e1c0350dc. 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/JPP301900706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e542e724afc7756b781da59fb1044b2d03ea5f079e05d98da058403cb790c2. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/JPP301900707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7848da0026b63ee1eb0a6ae459b8dfb9a6c8a79d5205ed2683f9e51caef89d7a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/JPP301900708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb231855a85b0af26e30e7fc3346cd8007dab633dcf1d1dc9656bdc8fd8c3943. 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/JPP301900709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356c844dfd514ecdc59e426ba225a3dc8077b9eda87cb6c522ce3d28b7a3668c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/JPU901903302.