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 0xe6c7d132f9bb194e1d2039583778c471800d28e16866d09ff5db064560d1bdc1. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cd86fd69-438a-419b-9548-57f30999d171.json and https://artists.proofprofile.net/proofs/artist/cd86fd69-438a-419b-9548-57f30999d171.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 0xccb530c14fe6829bacda33bf331228f9824ed576fdc038b25f3f8a8dcd5aae55. 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/US83Z2406428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ccc90f5d1f5dd672d186a4bf449694ce66589e48ec31af8769d366df99147f. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/US83Z2406427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f08e14cfa21ce8455c236f2fbf4f1254e3f76c174d65e1819e34bc0b42f2e3. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/US83Z2471566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38037910cc9e628264c7f1d56e8aee8a4823d412669779ce3d97ecab95089e0. 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/US83Z2471567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fda4e33d6e857cbaebf0e0bf7fa0ce9c491a2b96128f7239bcebdafaabe0c9. 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/US83Z2336929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25fc15b379b647e1d5d76cb68e70e42d9651dc8d49d7107772a5c1a4084f4f2. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/US83Z2333761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd819ff8133eb4c29eef5cd0ca3fa078802f91d9169340da52fd84f169b7773d. 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/US83Z2226573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8f59666d224378b3feee8028d1fd1efcecc8839586e7a2eb2e014643fcb76f. 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/US83Z2226575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ccca0b5ba301e8ada8f4a69723a99312c25923ef00cb56765ee3de294c90ea. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/US83Z2487198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff80463f5369913b144f7c0ea1fb52893f5c77cf209519335da9113c16d5b52. 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/US83Z2223030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b7750cdb8b951fbbe1d01c0979cc0b33e18633f044c878eb85b41eeb3deba2. 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/US83Z2225646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ef463f0d960d63a37a06c6e08f918bd4784b196644e32a9791aa13c47d9ec6. 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/US83Z2315936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5084e18fe96aadb52fe2eae0d20ef54612bc2bb0b745ea50ff8bdc6a51819e21. 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/US83Z2483083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d860295cbb13a5b09bc675d3af836ae0dc519971a49362c311652489472c24d. 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/US83Z2219258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7282ed01bef0e8debc8b3b5e92fd228eef24df6f42d0ae0c5f53917cba4f31. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/US83Z2329495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a68db0d4887cfa35013aabf3ee104195b7b1ec5b9502f5e156bb90b961c3cb. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/US83Z2346719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd16295866875e7319d2145370ea4501f77c18e381e4a8de3115a9140d18732. 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/US83Z2346724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4bcc484d3afb11687dd3a3dd9cd261524db543b913ada1757f5a8954edaa54. 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/US83Z2329496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b80091d5a3bb537ccd5352dc358eec1a9854d36b280525970ed3054693e0095. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/US83Z2217777.