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 0x726cc0a4a8c811b3cebef5cfc22a0ab7495a5fd1fd4fa99074247ac43ece8f73. 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/761cd463-240e-47a0-a460-863e3a031560.json and https://artists.proofprofile.net/proofs/artist/761cd463-240e-47a0-a460-863e3a031560.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0ee7e30efdb3720533bae8bbc982fe1107941017ab2ae68535ca1af90e53dd. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QMBZ91713723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x484ea613c5260878f1f742eb9ab9256caa02b422a900270367967b4b2e4eaab8. 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/QMBZ91713725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bda9eab0c4f3b1ed459fe8a64124be6e8e54e9e4df1f2276cb640ba13ae73ac. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/QMBZ91713726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb67620088e558f42899a2b002c3544bb1f88275278fe32bb710857e69bd9ca. 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/QMBZ91713727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62aabdb0c35fbe15544fa15dd4de8097230c224179a68dc5bf241295d4e02a1. 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/QMBZ91713728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8d4c7e9a04bd336eda8d6c0e01d821ec4de46cab2fd8714809e55a82e0a91b. 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/QMBZ91713730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9b7a09bf476f2643d19c7a05b974240a033910cc5b396578b4350f8b9cdc7d. 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/QMBZ91713731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16110e09deaee094742261f01b1714606a339197a3aca071a73ffd77f8b02b0b. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QMBZ91713732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f43959bb753a44fcc81d3e60fa1d21f8857a82f4ce826733bd88c92464d5cb8. 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/QMBZ91713735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eaf50904a8f5317cde525eba61c5ed0d9edd5827ab25d99b4dcfbe891b667f9. 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/QMBZ91713738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefcf558fba398391de39d22bf00acc0991e1460233b3805dc391475888e887f. 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/QMBZ91713739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9715f90cb79cd94f265e2ef944c797778bbc6beddf20033fb4e74b88f92d0d71. 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/QMBZ91713740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec22e388f3be1955fb725bddf600780f002d7d103e6c78a989cb14d31a45b7d7. 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/QMBZ91713741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68213ba1939509cbdb2b85af39ff60e6f2cff35465b9d82391ad2eb28e670d57. 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/QMBZ91713743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6046b6d97e299d328d8a85d5c8946023d415169adc01c91c84511d34bb7aa0f. 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/QMBZ91713724.
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 0x1b1e38966aafb54c3e9104167a5e8be7a01ad51c56cd0061034bd19b9882fdc9. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:55:45Z), 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/QMBZ91713746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee96d3375eed6a3f626b234eb8e639ba66e6c4374f480e4a8e98529c3258093. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QMBZ91713729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e953466cbf7af20808a2ae15f837d5280e01f48dec789a79acfae9459fff0a7. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QMBZ91713733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4864a52f0dff54570f5a99d79b2b75e8cd3bef194f74966dc749352bf407ef. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QMBZ91713734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe87aa8ae05a71a2483891fa3f0dcfa7e47243bee45829d0723514fcf29920dad. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMBZ91713736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517bb98925de08678d1d15774ffe51832bd60eac301ed64323b9eef1b27fc655. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QMBZ91713737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908fa901f68744fb2c3de5fe6a82636f7dc3633f4eb56664ede3a1b38fe633bf. 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/QMBZ91713744.
Argentina!: Tango Legends from Gardel to Piazzolla
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8ce2d204366b64a495d2fbee52a98e280e6256007b1c5aafbff95bfed0fa90. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/FRZ333103070.