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 0x14f5eacf269038b0ff16fa0fcdb0c31f57ba808175089d66c180986d25d76fb7. 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/fb9ab93f-a4f8-43f6-add8-30ebb740c6fe.json and https://artists.proofprofile.net/proofs/artist/fb9ab93f-a4f8-43f6-add8-30ebb740c6fe.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 0x1ed3f306868db4b1a485296c89ecfd24b316b1be697524ec28100e83d219d381. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/US7VG1602236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ebffd12d2ca689e39cd37357a98cc1836e9e0bdf2fc5c3feb12394a10fa923. 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/US7VG1602238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30d39a1843bc4b89194de4f768c7e30abd65635731f0d1e6e3c68c703aeab7c. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/US7VG1602256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc112832015db7e41250ea23f506d3483da6e6456de5b8c8e65499b2fa9c793b9. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/US7VG1607939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1353477df021e7659eb9f3b8a6521c41cd16c493ac1c9ebf2855c0341941960. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/US7VG1610021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607b717038ae1484f0c306de580e0a6873b20171d35cefe953bd28df377b85c5. 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/US7VG1615046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c89a2158304d3b08d812f741ef5286b29535249c9e964ffd2546f23978a1e6a. 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/US7VG1686715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae34a2e1603e415bef7c7622c9db3d70c81e4a86c294c88af26aad1467878161. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZ5AB1645396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9fafad30d7b5ac8680d660c0c859d7ec7a21f38ec527f0e723cc7d5b0579b1. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZ5AB1605571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348b0eb9b082704ed03681bc81ccb662cc425460033f0dabc69781a2ac1deb87. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZ5AB1645226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x168f5f8acadd4c92ed1d1b58d1e3c44b9775a15f8daab00dc04bf469e5940b76. 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/QZ5AB1645241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3b48b5530d3ae6ddbb2428ebebc20fc713cca2449aef3c53a282ee8d3c65f2. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/US7VG1752345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3349d5c8422bba70d4e3bbed31b5c530f69b4dd2f8e26b3990908bcac544c6cb. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US7VG1775107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ff0ea07db5000af4c45eb485d3db695432c130999734319e6aa21b910710ba. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/US7VG1774931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cce83b7770f979ddd16e7b0ce4dd670b3552ea45ad3fd977d1741bb8c91f3b9. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/US7VG1790505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb035aad5848771f7d743ffdaf72304688ca7771130079cdf49fcab6f783955f0. 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/QZ5AB1753614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f685f4d8b9dd776762bf4dd7812b7c3ea7257a9d3d037d7cd0c17fcd3a5506. 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/QZ5AB1760877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83976bc61a0504a0b9e38962fcdadeba717a1bf9777c39c762a4aa874395a04a. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/BXS321700054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43617c8c5d16efae756857786faa86e0ed4a0d7a596f24ca2aa2ba4a63bc6dc2. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/BXS321800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bbc6985debe42986cc9b44d9358ffd68feab43b1e9cfc592a203e87b35fbee8. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/BXS321800016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bafe4fe4356637a29f5a9c4f004707521ad9b3a25ba359b53d232d6b5390bcd. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/BXS321900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f679567e123f68acdcb4dde8d11b9192deb08d3b23e6c9874138880ecfbd4c9. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/BXS322000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e5a105bc50577edf1fad4e85074d0bcc6a61ea8ae1666be1cbcc6f788f4de98. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/BXS322000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6a8a59a073f7d3b04f7feff007568bf74daabfc242e679797bddda0bf0c7e9. 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/BXS322000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2ed810ae7dc8568bd1db3483f510478a598aff9e1687bd8ba25630cf179d5e. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/BCJF72100069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x168f5f8acadd4c92ed1d1b58d1e3c44b9775a15f8daab00dc04bf469e5940b76. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZ5AB1645241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd193f4e99e6570b2a389a0280254384c467e84b08ca526b03e5f4d82730e976. 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/QZTPX2192589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189c1e4286357e44502800c50ded7554ff12aace635c27c1ce46775e89224ca9. 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/BKPSE2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e28813e2014f74ade63c38127ed09ebd8dc0c8bd49d9866666c19d1c30b6372. 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/BXS322400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74fc33fb381e17587fe1a7dbd6ba9e9f71da1518a1bc5c54283a14461bf29851. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/BXS322400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb3fb4acbf52eb59083c1b782337afbefc75a32ba0eb63a2ef25dd9f55a2da4. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/BCJF72500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb182e7310e8adfa9a4d7675fbb977efb5f27ecc1ff7b5605aa73276a5ba3e47. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/BCJF72500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87380ed575185e496501d319ddad0036b694182cb28d534d3c5b2d1976f6b880. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/BCJF72500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ef492885b7636c787b912edecd9cc4155d3aa90db2e14a9614c88354788491. 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/BCJF72500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x470b901239392f0eaf0b2de5ce77b72314e3d43a07d74a060fc240555b2ae658. 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/QZ5AB2034266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62840d6088f082dcfd35b0ac20f784a2f8ab7fb3f0e9aa3ac033902671ced4aa. 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/BCDMP2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b50645006ac6dd1a183fde1de1b62a6d0c9213fc2ec8b2791d66753f826a0c. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZNJW2199658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033e4c4d1b0a075b8e2d04ba18be91531b4e96cc70e4e5d9280991851237b3b2. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USLZJ2457615.