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 0x38dedd74cf92b758b6ef476c696b9676e9962a7f55b92df5028e7f183b81eebf. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/230534bb-15dd-472f-a8c7-cae3925fcabd.json and https://artists.proofprofile.net/proofs/artist/230534bb-15dd-472f-a8c7-cae3925fcabd.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 0x233772d49259816eae50e2962d7f7f2c2b0017b9145adb04b54d399cad13689e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCADQ1808395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb37ea29a3b7b2ed2c036c877dde434b11b5bd4f27daa4c178df834052285c7. 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/SE6TI2190416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e044510985825a7f4e6104fd3842e8d3cc3ff36a0cfdf96138df380c6a0642. 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/TCAHO2379852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184a6de167e3bf41196ae944799a82eb97a1f7e9a18c9726162cf27f57eb1fda. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAEC1953890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0bb629171d733a83aaf6971f4e8302fd27b14c67771c5cbd04cc11484e3225. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCADS1854889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f3f6d3435d434cb824341a71fed99a91b3ac64f46b9335d54f2c295bdf0981. 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/TCADO1845827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf48a29af9fbd99bd45014760575f06d2cd48f1b3ba66bc7be947426019c2c08. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/TCADL1888130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae389ca1d37deb999bb5f402d085b8356900e80b2a369d737635dd2e0c9cc38c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCADK1896755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a656b67b7d67246ba295f7a8b00fa9ac54d8f6317f2cb3446853869dcffb8fc. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/TCADJ1771388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44298239bedf1d2468d42cc3579ff2f17638eda4449b0e492bd3191dae01d9ea. 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/TCADI1712588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d478dd4736b10ce3f82837f2cd5c1582c009f0fafefe5aa1d690de7a1ee472c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCADG1796441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa537a56054ccb559ca314f229ad714327c576e04b028645e8106b3bad60c2db4. 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/TCADG1793648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4e292d57c85f72aa2759cb2a15cd112a1209b947d297ce3751a43fda7ccda9. 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/TCADD1735483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f178647c8f08a30932393b4e0663aad0f29046670369204ec099e8b3231ed5. 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/TCADA1781201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46678cd5525866799ec3ab3991b34d9ce1b8fa3c916edf8709cccf92af34588. 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/TCACZ1700619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee669da670d97bc3b0eb7a32789c38c27f27726f8fc517d240a4f4387fc9c312. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAEQ2072693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c10178a55542846b38104b6302a16a0b0ef69e121fefaa57bcce1e1dc59b874. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/TCAES2027294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84040dd5f6bbbfba88522df1a0899dd9851afaa02cbdaa4fcbaf803e988b77c. 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/TCAEF1901651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07beb7f04ea03962ab1586043aff595b138241b33b7017c0c84b0c6cbcda6d17. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFZ52196095.