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 0x69800e5f459e2c8c18c9a77783b39baf0df8ac7f1723ae1c33bf1c6fba6cbee7. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a2333ea-98e3-4199-a024-af91b769925d.json and https://artists.proofprofile.net/proofs/artist/9a2333ea-98e3-4199-a024-af91b769925d.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 0xc1e417aa4b0e36c12d6e0cdc945d4e62f80acb78bf0f2c455805a4b1ede07a80. 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/DEPI82219365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98d85919b2ae868b1a6255c4eb8d4507b1b0e8a8c766b84c3e72376a29a15e3. 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/DEPI82222682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83eb7751db583166ec7251b80009837ea96425f545c074e30f69520580918f8. 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/DEPI82222493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64464e06c9c8b5f99f8917c588cfd46f2b39be373254265fc4db02868586492. 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/DEPI82222681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaff90aa2c4a72dcd96abc121d55d1818fddc3401c8c89911048df0bd5c505c0. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/DEPI82222683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98d85919b2ae868b1a6255c4eb8d4507b1b0e8a8c766b84c3e72376a29a15e3. 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/DEPI82222682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e417aa4b0e36c12d6e0cdc945d4e62f80acb78bf0f2c455805a4b1ede07a80. 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/DEPI82219365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83eb7751db583166ec7251b80009837ea96425f545c074e30f69520580918f8. 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/DEPI82222493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e417aa4b0e36c12d6e0cdc945d4e62f80acb78bf0f2c455805a4b1ede07a80. 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/DEPI82219365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e417aa4b0e36c12d6e0cdc945d4e62f80acb78bf0f2c455805a4b1ede07a80. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/DEPI82219365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff12c193f2771325c6e1d110cf94cb42d19540f4bf06b5e56a405daf9d45aacd. 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/DEZC62118182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b6888a904def24696bb81cfd08bad95d8272e7264d00615b2d0f39136e1af0. 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/DEZC62155367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d98b4c4ff0884a014889308e977de1a48ad1293c5dfbffca9abc52d550db564. 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/DEZC62028111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ddbdeb328569935559131b0e47f6a55ec79859bc23a4a47f6df8fe9feed2201. 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/DEZC62185139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91bbceadcec1141bb91f73d934d9a171f8d6005941dc7099d8a8fe71650e095c. 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/DEZC62185141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75cfc79ec7a4ffab19e6e1e0b9138e283ae6e00882d99259f2ecfbf632fd4a9. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/DEZC62185142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b6888a904def24696bb81cfd08bad95d8272e7264d00615b2d0f39136e1af0. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/DEZC62155367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d98b4c4ff0884a014889308e977de1a48ad1293c5dfbffca9abc52d550db564. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEZC62028111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47c2feb0bf547b51a7d44e39bc39e032369b77572a4f41fccebdf32156cfcf7. 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/DEZC62002290.