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 0x61536258d4073bf0b7232bb3b848f32d05971e83cd0858084c42160d02eb6f6b. 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/43d2e09f-878c-4968-897d-8a4f9942ae14.json and https://artists.proofprofile.net/proofs/artist/43d2e09f-878c-4968-897d-8a4f9942ae14.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 0x5d00d7456031f1406436a6d1e1720c88ef948598e9d9d7b65c3fbd076cb9865f. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QM42K1774593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91ca81875f709f3046c130d3e982a390cfc4b7bf115ce0acd1affd208505690. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QM42K1611947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d20cfa19719a6881a1fc96d2d02fa1fbef468e3cf79ca23b6d870befcf4002. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM42K1710400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce93b863cbde07c4a6095fe1b66f0dfd64c3f4fb2f53ffb51bdb74441d8e292b. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QM42K1704993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6804ccd6ac6f40ced8db9edda6c36ef59882de42fbfb25358adfdc1158e5a935. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM42K1765751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade921b1a32d5f0ad4f5e71007622530fd46ab75a595ffa4e8eb395f7a28789f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZDA51967148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b984c23fba590f7373b33c086ce12e05aec94bf94dab8d90f8f734e944beea. 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/QZC5P1800061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbfe439ba7ba8549ce5d9ee53f40bd7c39cb03e010da216e8ad3096ee0c32542. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZHN92072989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62a479070fffafb912c37d3f2aa26134a74f95ea7b5d7ad624cad8e2d902241. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6L2067989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9137876c7e1c71a0d9dd7e1d167c248927797070eb8b5824190d829ca2935c0. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZMEP2105300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b198dd4485cb6cb63eb7042a68e9b2a71e2a950ea696636b2d01d6ed5b1832. 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/QZTAT2182214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d53f2f86378e4bf95200fb9cf6ad40653754c6b476d50b1588d4b1a4603a18c. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZNWZ2230728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b31ebb3217db2557f350548ea5d1f8900fbfb61c7765d4c5093ea0e7a9d8bf9. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZTB52272916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e12179d1228291cbbd2a5a314b39753b4036fe2ae7fb7e47249e5ec970a87fc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USANG2293281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6ca59aeedcdd4ed5fe0dae1f0b04cb5bbef86b965fb7df4a581b0e86f0565d. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZWFE2489777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabbb9b46199e8c75d5b6767bda19f1962499ee73a0d7b4ef6d3d5247d53f71d6. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZFZ32507130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3fc3141aa60aeeb9f44014848a65f157f8482696901e9baeb3499779e2f999. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ7Q2551453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6085f650c9f59ce95534e3ab00d9a23bb2c9caa8333e1f0b06107152a75cd9. 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/PLV401700002.