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 0x48c36f3ccf4a218547a54db37d8d143c3496890cbec3868ec1db238570da7cdf. 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/6e2508fe-16f1-4da5-a6b9-564969b3bfb3.json and https://artists.proofprofile.net/proofs/artist/6e2508fe-16f1-4da5-a6b9-564969b3bfb3.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 0x130f5e246a2c0c173914688b3642fdbe062d4359c533217349918e75b7a9c0b0. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZNWV2191671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9c1002d90f93376140f911b9acdfdf6aff9f6d3428063cac8c9c289eae6cdd. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZKDK2298263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67adfb8f2bd21dec5c17e8f4f20a125926f90567fd46100a9a148ccfdb5cf228. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZDA42265294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41670c891ca4e3f3e5029585dc2a2bb5f284d0a6787526a4214f2043d1ad11e. 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/QZHN82207369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa646eb677a814f402f4de7ae8bd917161e8db6d309892fe165c7ebf8909d09. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZHNA2211145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ffcc007dfea1b9ba72b881bde8b1959360b8ebbf26753ff1f109ca5b8c05a0. 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/QZHNA2211147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c58164253b332972c772f57084b34e5461afaccfaf5e034f8ab1b3ef28e68a2. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZK6F2220222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25983e63a38ad48c3b2635cdacb21e21f2ee52496f48f4733e6dad36fb34a70a. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZES52337845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81ad5d49e96806ef848097b990443aa3c90fa13ab91634375a9ec2d0b551ed6. 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/QZNWR2373859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d0875047df590c369ef437466062c976b05c7f914cafc731261acc9e5d8948. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/QZNWR2373860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1442e1ece98fc12b097736c4a394c0fdbfb3f6934deea3d9818de238474cb1. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZS642391165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d1320f429339dfdb96285fc239f9ed718fa2d1142153c9e039142ff61505a9. 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/QZWFN2378731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa04372dfff1b45b997ae454bf2a8d1e13dac0c81cec9970346a67ca7626125. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZFZ22421344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3505e3630f1d24bda56a11a5d5640f08bbffcf3567a4dc898437b39e3a4e45f8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZFZ72499337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316266564819f5c9cd1d3c5cb03f77ab4269944330a671b532bf5627b3244b82. 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/QZDA82450943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11bd658147c0d9111daa43172742e8901e3708cb828ea7584eb26b8440d41e9. 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/QZDA82450944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226852f23834a3ab3dd03ac74f4726ee0d492760df028d033d51227a3c5dbd08. 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/QZDA82450945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3505e3630f1d24bda56a11a5d5640f08bbffcf3567a4dc898437b39e3a4e45f8. 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/QZFZ72499337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52028455929b3bfd0752e2d1c76732f972834f95631c256fa57b3a99cbc00a30. 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/QZDA82450946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa43c50f32e81ffdde4cc8f7f958ab2456e8a80247bb2c4f0b273ce6bbe3d620d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZDA82450947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5fb6af67152e26d6cf86df9579a407ebf97121e010df2a7f565e4af5e65ef9. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZDA82450948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa04372dfff1b45b997ae454bf2a8d1e13dac0c81cec9970346a67ca7626125. 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/QZFZ22421344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d1320f429339dfdb96285fc239f9ed718fa2d1142153c9e039142ff61505a9. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZWFN2378731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcdaeb89a66ab7776bdc66548a7a4a5490b9370c79de32b57929e94120ad2f8c. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZDA82450949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4923cabb533af9c7b966cc5ba792605becc9b1913dc070654ecb40146af25afe. 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/QZDA82450950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bae62dccbcdf50444cfcd4c89565c8b5dc0a5a6b409aebaf1e504857b7bb7eb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZMEQ2419940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca74e85171ff92e074d03e034f324115539f10c587ead549f454ca2da9a1814. 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/QZTAU2461732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e36040ee04546aa4bf9bc2edb02ab789cb4e0cf1975c24dbfecd94ddfad51d0. 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/QZTAU2462569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe59be053f357bc71b2cc253802d361b8541a2a6a94072f09d1db560ca1a868c8. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USANG2425160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4db87f472949c1a0a4a7a1ce0fa5c85b500ddb0d11d6b204179ff0fdde9df8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/USANG2425167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc26a4ad7df88c6065a852df4bb0e26074ffaa9defc45d8def4c82ddc23ef85. Chain 2 (Bitcoin): anchored in block 958676 (2026-07-19T05:43:13Z), 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/USANG2425168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0568e406c7796d8fffbd4680a9430d3290567f8fc59db300faae84ad06666e38. 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/QZTBD2468653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97aba2f4674114c819eb6422809c3efa328c07ae4ff0061a0c210f4dbea5d1b. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZDA52500494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e25c94a2ebae74ae89ce7c046a532cdcda00eccfc81664bcb249f0c1f24693. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZDA52500496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95bd9c8a05e8ae9eed32268dca3b216efc9c61505bcd8d60616f475a12455963. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZDA52500498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711ac742a637f084c3d010dbe8f9233c4ce884a993c3a28b62442b40420527b8. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZDA52500499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600ed8c63b7e1a10501c913856111742fb5730fd0845c00261f4ace567f53715. 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/US3DF2553164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4095f3ad36bfeb2abd45109627be72ea4d4bb2cfc748d732ecec9b15130cdb. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/US3DF2557485.