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 0x722b4ef03ff0d08661936989a3329ec1f78986232242a4185fe064be571f9e01. Chain 2 (Bitcoin): anchored in block 953885 (2026-06-16T04:12:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b2d0519-666a-4ae9-9945-d6b0c3170790.json and https://artists.proofprofile.net/proofs/artist/0b2d0519-666a-4ae9-9945-d6b0c3170790.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 0xc3c9c601226ee29bdcd750a1add3b236934aed91a9db1a2c5b233a8437de9b4d. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/TWEG12300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad991eb1852833b1c0bc97e4422fa6151767a5500b71280b8b0a52b812af0e66. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/TWEG12300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a7855f7f7670c8ed459c4c16c12e0568e95642c3215c4fd2d0324c6f577ed8. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TWEG12300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b43d2a18f144e182fa761a55e5c50efbd77c0302e8ec1e69679e876cfa9a82. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/TWEG12300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed6aecfa384bc93a3e021b40b044aa2ddc7f94df2e8c28047e3c9debf98153c. 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/TWEG12300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812dc1d88dda85525a54172c6b292ec116fb55801de2aa65ea9b4b1090c87ab2. 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/TWEG12300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a6a757929ead79fd0b2495a35d0acd3f408616a7bdfc60630243275429cec8. 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/TWEG12300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922df77db702aab453b270e817d62fe7df91efaba2f45c19c86382012e16d360. 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/TWEG12300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00eea01cde8738dae70ce29c1f9f3257151c655635ec3a8a740ec38885f81098. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TWEG12300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196db65779724ea8c7e274074275dbeea1fa35a1461c06dfd518df209c661371. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TWEG12300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aafe43bbaace1cd403dde5076aceb0064feb5dbaf310875947c0c245ed56e74. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/TWEG12300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3af90ef64c0a3f230741f67f178274426e04f4cfe9f35f68532c80d3d7ba955. 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/TWEG12300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb430cca7df8b4183768d64364174b0482a841b3933b0013c1bc7228582754194. 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/TWEG12300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7144f636de4bb9769029ec7d49d4bb99a24bbf995a6f36870e4e3640bb02392. 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/TWEG12300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98434e1ab469820a7c04445a835610ad1294c7d03da60c973e3f9a46225a1d14. 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/DGA052492253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x537b52c458254f7d271eb2affac4e4b7fa68f0972b454e66f706e77599b7ff66. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/FR10S2554952.