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 0x0c8435dd00ae526e6bcaa2bfec257501cd106d5aa8bb36ec22685caecff49a23. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/550f5507-0832-4fb4-bd07-4e35af99599f.json and https://artists.proofprofile.net/proofs/artist/550f5507-0832-4fb4-bd07-4e35af99599f.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 0x09d96e9e49e2641fe2672ae40e338503590b9816cbd13700ea5036782d514b06. 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/QZFZ31932977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2b63e1b043b3670909cc745938f641d52483ad141de551baf9189180f5d330. 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/QZFZ31932978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd03872492f6f8d75620a4c5682100ae49ce387e4cbe5885fcc3b3c2fb35e69. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZFZ31932979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792ebb9d1febfd89a31d1a9c878bffee776c7fbbed0b1c2f1c543c526a55b474. 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/QZFZ31932980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf25261629d4a957796581eb6bffffa6b1edc47ecd4e110362b960bc3d137cf. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZFZ31932981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437be65f1ce63128dfa040e19113bd246d58fc098ede10bd9e4417e689f52830. 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/QZFZ31932982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387e626709a67e49c7eaba2b019469e191fe042474033db851ae44254b5db4cd. 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/QZFZ31932983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756f0077794d178058469afa4ef682242e93d8bbdb80a6a44e728652d9883e11. 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/QZTB62282195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2bea61a66a8ee3525244b4bd093ffd3fffc45f8e75a68ada7092246c37e6554. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZTAS2109241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846c35e88b5815652f839bb76897d1736f83eabc18fd4d39dd2d73c6d2b697f1. 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/QZWFH2473382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ddc7071f7d25fddb61a3e769d15bd73a19c2172cbb9e283eab46bf4c80823b3. 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/QZTBA2424696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846c35e88b5815652f839bb76897d1736f83eabc18fd4d39dd2d73c6d2b697f1. 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/QZWFH2473382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8512144d6dca7e2c036222690c590f7798a7515e990d317417f8add8580706f0. 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/QZWFH2473383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838a3968f604da734bac8529b625a4e85d4911ee318540fee9d28cda949cc401. 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/QZWFH2473384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9f9d2d6cd62095e89ab261c259d0a8cbf7b0ed54c0db9b4bd54ba1c187b84e. 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/QZTB32423712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f2233882998520102417f2854b953dbe05edc62f48ff07d9312b2f90e9d852. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZWFH2473385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ddc7071f7d25fddb61a3e769d15bd73a19c2172cbb9e283eab46bf4c80823b3. 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/QZTBA2424696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x581c18f71f7f639774f42fe8e689c0c1fb9f28590ac427ea42b015de0a3a95c5. 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/QZWFG2448131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdaf11b925f38ae0e35d2dff63ca2c0b3263fb36ae7c6b2d4eb12d82e626472b. 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/QZWFH2473386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678d15e21689180ffde5a77c23b0ba1eb8cb6ec59a8ad733af97088164388c7f. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/QZWFH2473387.