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 0xc2cae1fee4815a69994c85992f86d8551efe061109f36dcf2f04f9a311ebf1a8. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c3e7d22-b7c9-4a32-aaae-bc06da67cc2b.json and https://artists.proofprofile.net/proofs/artist/7c3e7d22-b7c9-4a32-aaae-bc06da67cc2b.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 0xad0eb0231099e2e3e984b3fe10f998bdd6b36f41ad49fdb7d95d8dcd6ed2c501. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/NOEJN1901011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x873dc0303dd31dd501b1883e8e0045447c4c1b737d2e6eb7daa82d4dab10c22b. 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/NOEJN1901070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a74792d5cee15f3cbd06017c251853481667b0258a215123e57dd6071714246. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NOEJN1901080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d521ee14e6da4b7577093c243d5637c3e1ad3cc09801a2f53f713bb7088ac74. 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/NOEJN1401020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c7c663f4747b73f4149258a8ea03031a3b1b775b8946b8d0e895e8a58af4e8. 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/NOEJN2004010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bdbb684d9e999fc861adecedd7433760c67f46fa6605df98ab697b9bc9be4bb. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NOEJN1101060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419ec05f38d35d1a9d71fb0b3ff7629266af5f60c524dbf77c2779ae90575b31. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NOEJN1101080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c2421eda58fe0de93c9ea8d44e876b11afdc7edc23a14868fd44376c08ecfe. 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/NOEJN1101100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f11f58306a55667fe0582adb0bd6c890476a562215ed0dcac7572e30ee8a23. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NOEJN1501010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151a7ab0221961f12be06307ac647a6cf6f6b668eb3725e25fafa12f3a49d8ec. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/NOEJN1501090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34050693c48058610d8f2b4dba3898d0e9101e7687c387a15a36df47d7b31c33. 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/NOEJN1501100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86520100d09a780b2164837ba80e795cd7869b006cbb1cbe9dc3ce3e00dae13. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOEJN0801040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf8335c88e5b8eac376a5aa717adf9b4a4fd8cf3460a1b468a8f5b8cb9e7e4d. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/NOEJN0801060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377783bafbbd4aa72a47c93b055cdc523e52621b78710cc6a879fa099147d201. 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/NOEJN0801110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ab2da2e0fd05988145d40fa0d42fd4e11e9a4e4543da57734e561822746994. 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/NOEJN2104010.