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 0x9f3f9f4d1a674465e97cc7f21a29faa8e4b8c8e06f9162274127e43e7f2837ca. 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/f8bb7ddd-707e-4eaa-9f9a-cc4c1d024562.json and https://artists.proofprofile.net/proofs/artist/f8bb7ddd-707e-4eaa-9f9a-cc4c1d024562.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 0x59efeec16c7930c1dbb377202cadeb3cd796f45e8da34a089858f0bf69cb0440. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BXL4O2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686a5574a5fc8af8c0820dbf5c41755820707382b308396a5059649fc54fffe5. 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/BXL4O2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6506bf4059dfea23c3c9b5382e43b50d9cdad6fd554b5604a8202845dabec6f8. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/BXL4O2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2dafdad009a55e55565519a06e85464305563c21e0ec94b4745f572f2deeac. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/BXL4O2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4dc16d19c99539b398c0affcb5c69d7190932952d6da3561c5a701ad13cbf6. 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/BXL4O2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f3abda7d68f98dcf7eab9d6dbebeed91d76975496cf0c6409b0eeae049d430. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/BXL4O2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217963d6b6b9fd5abb9817fc01eecd4d932f17bc965c97db39ed70651ea87bc6. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/BXL4O2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e494d49a0a2de6c786fa3963b9b543eea350120a6792c37407d2a5ae6c874e2. 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/BXL4O2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcddb2ad7d12bf266553d881b316e77fb727985161a94089d4007807c64e70a4. 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/BXL4O2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd1dfb40dfcbb7fa93fbeb925d54d0f2c9c193f31050f2b6dc1f1721bde954a. 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/BXL4O2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53e472b0462e1c87d7c599f45471615c06a451739552ae9c658f8895ec78ed7. 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/BXL4O2400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53be08abe17f85c4bb92b2d1b79615435daea3236d67407205d8b223e4e1a50. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/BXL4O2400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8991aeaa7b37f581df77f1dd7503794027fc551cb5e810c897d94e3afcc341. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/BXL4O2400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62b5675842642a81f7003d9befe4ec2aa3bff4bc4fd4d1265f0ef4e220128a4. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/BXL4O2400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65280a3d17380f86f94a903d1794e95e40c65d3444277ca5ec426718a6197af4. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/BXL4O2400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfcc1ad0aa0e3db30128e76c24064bead924d7dc98c5a31fb3ba4a700164e4b6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BXL4O2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282e44192ab8340a6c9caf2e83cf0b7b3023311cce052f314d3b99972603be42. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/BXL4O2400027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29dd3a5064e5d16c483c95c0b21e60f035bff6ff906c05d1ef4a83e71ff479bf. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BXL4O2400033.