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 0x29087276014a5176cb6dfa088fde431d7ca38cc214a471e1967f0c96b4789c42. 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/d83665f3-1e82-4a10-a8aa-c9ffaf571b5a.json and https://artists.proofprofile.net/proofs/artist/d83665f3-1e82-4a10-a8aa-c9ffaf571b5a.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 0x02afd297347b468e2fe5004eb46801d11ef3849181265704a09539cd7e71e081. 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/USHM21901595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d8e62c35dca719f8530bb6ced0ee0968b0577feccb0aa9ea4a0d102b469745. 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/USANG2267672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c11d435af7c78ea19368aec840ce1fb0e782688d65dc51242fe6f02193d9e9. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/US7VG1917623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb4d8874e617632d0c683bbca4b15c2c4bb53af02702098dc79c295c9fdc6be. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/US7VG2180270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96274cc092a81deaf391a66b9f072ec73906d517bd0d592fa8ac524a54c8c94f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNJY2224256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a3d3cd45e98bcf402acdc45e9dd19fbf936d2767f784b9cde00d05e7747551. 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/QZES51970625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2dd8d1e16dd46ee56b1fb3024ac0220220d55142071c40a5bebc6e1fe3ef4c. 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/QZGLM2438850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc104b50767f3f9adf1e0a55e2a1eaa7b33d6bdbc31cd9c1163aefd9fdaf121c. 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/GBLFP2485605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09dcff1c86a5f6e4b2adf72294c8dc93a1b308615f97fefc2045d6adc355e55a. 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/QZTVM2387034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea2ee92314164558ed69e31a61019be1f6c5b448f98b18cfddf61ef7e170b67. 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/QZGLM2070163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c595f759971f7ed920f55fad6da0ff04481ed27c74395c1978fa5a0302b7d7. 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/MXD782300487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba513b782bcd7e3fe18063945650f1af77bf91612f70ec25f52f988d12049bc. 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/US7VG1950524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72be1568b51b8e35391e010a634238ff4371b1435b5c21b8ef715ce7676fd1e3. 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/US7VG1950531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fe5f90465c856f75a8981ffa9a274c1af59fc01802cf0a9319998d2ebac06e. 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/QZHZ52299068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21868ac1834d0627a7bd803d67be70569e98707084b4cdf0d76dff52a10cea69. 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/TCAFO2102116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd68ca0ed677169d6af3c794e17907fb57fe3239d4623a4f80eb21c1ea17b746. 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/TCAFO2102146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb3d9e3cca75d72dd540fb353c324c7edd608c5f92ca739a53798444c9f0a6b. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/TCAFO2102167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0fbc30ea2c087a9d87c3109f8c241bcc07d8deffe3d8437c36a80b234963c6. 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/TCAFO2102196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5c4862edfd38ed4c4b8f3c2d825c2dd13981b2550be9b64afaff7153de5e60. 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/QZ5AB1994766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x079b06d3620214eb723534dfc70909abc15d26cafb5f476896d6f8a8107e7e10. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZ5AB1994767.