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 0xe5ac1bb57783d25223cea87eec07c6a05f7a69ff44a7619b9969067122e51915. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7f10f64-6825-4ad6-8885-7d6de13fa5ce.json and https://artists.proofprofile.net/proofs/artist/c7f10f64-6825-4ad6-8885-7d6de13fa5ce.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 0x710ab4b4f1b4f8ee06d00b5354476bc6f224b37fde2f3d1131764c80bae3d349. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:28:19Z), 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/QZGWX2189000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c75216649fa6e1c2db40a8bfb3614da00fcf80cc6074550649e5371168dfd83. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/ESA092225611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0668fbc3f8874a100afb7c42c4cb851d5edb555b567b76083893ff886c82589c. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/ESA012221111.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5269dbcae45d4d985192d5d80e0c37a48d79ac5586d281ee3db07c7cc67b037. 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/ESA012236757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f4c2c95d13fe81a52c1894438dd198dc36c868976793a989a27752e1ee6111. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/ESA012236758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745475f52505c2d4c7895b7c09bbc2926500d4299dbc91c417db24a15dc11494. 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/ESA092225613.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6554acc14d912f5fe0a8be0ece3aefc67ad747b883a9ad989173711928fd64a. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/ESA092225614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c6c234e7c92773c3503d504f4487a808224b76f672ce6aa6b4e0e9087ed6f1. 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/QZW9L2301641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3133c509c1a5c7effbc43fd86b88f602d4068adf8645f82a875ba5b2f6d5defc. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:00:50Z), 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/QZW9L2301642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4cf5af7b90f6bccb99881f19de3023dbde9bc508430f5c21a4a7c87004652d. 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/QZW9K2304342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c970e81ac240dbd0ad86db4fa09ea5f699a1e2acb1d51ca79f759e146c1764. 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/QZNJZ2384699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4544124dc1e12fe32e8139ad17fad5c447462c15ed210acc6b49872824124de. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/QZW9K2387301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d8baee7899a5a824d9612132283f66c3c6d7ae59cd0adfaeca616def415a91. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZW9L2437754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49dbd9f4b5bdce3ac2299abe653e35981b3f87d61b6ecff1934256ee63ef7d6. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZW9M2418829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a1d70b8c7f5f8715b2bc04999bc7dc8b7f09ea34bcf1c950b08b5cbdfb4311. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/US7VG2591132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4b5858a23e190efeda53ab62b54fce2b9116a54d9183c6a7b227f507d63859. 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/QZMZ92542099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84476db1155756f912fff57acb0865c26e394a9472599f9fffd2eed27b13a11f. 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/QZMZ92549975.