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 0x42ef189ea31d41376f04e56ae5af2c641f35132ea6de2738efb238a8141c7f81. 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/3b98eaf6-cc88-4138-acb8-f1811ae04a64.json and https://artists.proofprofile.net/proofs/artist/3b98eaf6-cc88-4138-acb8-f1811ae04a64.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 0xa1e9d45490ef4e5d9c461158b7ce74d3ae2d120cea0f092929d274068497bced. 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/TCACN1632756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8168043164f856afd393e4df671743a2dc27814d0bd0db20141d8b6d85a5101a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCACN1632764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af9d12824bc8bf61b14f446aa4c12576bed527d2fcd8c3163d6c160fb827d33. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM4TW1930807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af9d12824bc8bf61b14f446aa4c12576bed527d2fcd8c3163d6c160fb827d33. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM4TW1930807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f0aaa06f51f15bcedafbac1339b253f72ac4e9a9b4f80940e747b1a26d8790. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:14:01Z), 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/QM4TW1930809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31bb09807184a8434ca8a5db075447487e89155a7285047d2693fdf341134d0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM4TW2132900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11976f6e6484914d08f43bc8750912cd1f85c1bb6cbbdf0f8c9b844708e5bd63. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TW2132901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d91dd6258e5aed54849eff7b57c98a09ccde83f7795b17cccf131259c078ff0. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QM4TW2132902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f2a6fa1432e6f77c2767ffc19b8ae0cfb3516a982f048fb8e0f07d5af8bdfc. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QM4TW2132903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270d07b1aa1b691bcb335a57a64c03da87b2ccd4f541ba029e0218777e812291. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM4TW2132904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e60129be4819e62c459dff7fe8a37e421e45c2fd39cf0b76cedc430043631c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QM4TW2132906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d577bc44f864855132874811d0a7a59884213a82bb19127ee4c70d251629c2. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QMFME2336182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aebc1121d745c389dda1d312c8524c93acb4ce5219d40161905b4279c162c84. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:09:04Z), 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/QMFME2336190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfecaf994586511ff591ea5552adbc4849265397a0c8a6b5fa1d66dd066d684b9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QMFME2336194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4431ffccba2f85b7b7a80c4e526afd2e556955873fef4d83984490797ec67bf. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QMFME2336195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0294906bc4ea454d02a6d1c82eb0651ef436e4d949f1ece980a14dee1cf12853. 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/QMFME2336196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7680e413878c70902137ad078cdb053819b0c7fee35dd61cfe64b6ac8f478251. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T10:57:29Z), 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/QMDA72371387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d822bcb62928fdc9030d51b15cb26025a8ef81e969a8b5790fbc0f33e90ff6. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMFME2299255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415a5bd321842396222fd76bac2e8cef2e9c4c7e2ebf5438f1e6ba56c812cd35. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T06:58:28Z), 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/QMFME2299258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029453e1049ee70d3d4d94013f1e034c5cabc6b540f3fa8484b4dce46aa988de. 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/GBSMU3904612.