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 0xa61cbb3cb5b70b495d7be1e5863d6f1d990dfe07616351bf9481c66bea225a82. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e27649d6-13cd-4ad6-9b6a-08780d0fae67.json and https://artists.proofprofile.net/proofs/artist/e27649d6-13cd-4ad6-9b6a-08780d0fae67.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 0xa410a0ac26c4db247abc6592a12faf43f921a6189f369e25a2e615fae971ef19. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZES92554636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf39a43155d987912572818d37f0497930df7e733e0f89e4d5a6991d9047f532. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZHNC2506499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa410a0ac26c4db247abc6592a12faf43f921a6189f369e25a2e615fae971ef19. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZES92554636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6af1db8d83434d1527e00be474698256f9eeefecd9144ba8f6081fdb2b0a1e5. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZNWY2562477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c14e7c5b66ff4c1a389d5fd128d85c1f1694794ee94adde64e8521bcfbef5d7. 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/QZWFT2537194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c90347f2b95cd59b5c86d030d89a4d68d1e38d7758dc9ac0f51a6d01917aa3f. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZK6F2578023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbd7340ff90b5d62fe19f810870214cc0f948247fbd85045ae31525620a2dfd. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZTAU2590027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a60379e447cceee9adb2942c8329add1d9b914e626e3ecfa5f8da94110065b4. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZNWY2562478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6879b7458237322e0014fc667f211a4385caa30a664e239fa8e5fdce2bced853. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZWFJ2556245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd620ead4dd68d5e6ef34dcc57b80e57f476d900a9d36dd79e5b87630ea214dfe. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZTBC2571755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18cd22d2066b4c26adc67ed65ce154d9907ca5dc1cf5e28c3b795e93ac13cb5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTBC2571756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ae46e1b490d01af51a067e471bca10972df49ad7bd4c437db7a343061bebe4. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZTBC2571757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba8158649f7244eddc78b45f6da09a6d92a75fcc7624fa95c5ceddaa165cdfb. 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/QZWFT2537195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf39a43155d987912572818d37f0497930df7e733e0f89e4d5a6991d9047f532. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZHNC2506499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec72dc3479882b0200a0d3261adc3217eaafe974c38edf6a190cafb0934505e. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZWFT2537196.