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 0xcd5846813806fbd0f7be16efa4d4700e0e645bf3a1f97e64ca08fe046ca679e3. 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/afb2c757-5b21-4481-8e1d-6dde0340e04c.json and https://artists.proofprofile.net/proofs/artist/afb2c757-5b21-4481-8e1d-6dde0340e04c.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 0xeb6d3ce368346006cc2f06547853d45469fc4423fdfb8dcd683b19dd5f9d1b72. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/ES71G2000190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3783dea977ec5d0d2dbf57fdb52c49b2d2065eaef6fae92902e7c3d529bd5b. 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/ES71G1945383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0924fdc2c0a44b559389c143ade30feb54e3655a72b0fb6cacbb4239b4d86e21. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/ES71G2050652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6b06e60c04872f2d4297c69e6715e3d12c4ac0ad74131b2a69ec32ba45d61a. 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/ES6082010701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339f909289557d45532e2b2fd8317b801ba4f19f09b2a2a59805d2afc2c2328f. 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/ES71G2050653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f9bc5e3fa489c600ee0384b115c3cdea2f0f6a27e592efdc24608f1e6cae48. 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/ES71G2050654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4e632becc92a71506d4720c342124378cce6e40d1178e19412f305c6526013. 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/ES6082010703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4387e4b02e9cd910dee73bcce080fce120bdd4e036003072aa8eeceb0f2bb828. 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/ES6082010702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd153ce59fe0340a15552b853f6b0a07a5916c3b94e7a6d26d4cbbe08cc54c0c3. 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/ES6082010707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d8ffd1b4e13a2c993f505ad08b28514ff728d2850da076165784f477bdea59. 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/ES71G2050655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7187ca2f1a5c4a6c5430d8a098a655135499a55ad6bc4959c31c3eb82648b84. 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/ES71G2050656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14f4d02ed7807203e67c9c8ea0df295c48f8919dcedab07b836a557e2355c38. 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/ES71G2050657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200cde1c285899dd59305cf5125e70ce78e26d7fb19f8ba424ba3bed04e728e0. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/ES71G2050658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e2b1ec2f450d3d4c4ee3ed9526627ff93f86bdaf95b301fba9f9b42de65fb7. 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/ES71G2050659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fac2a882f4d98284d681ec277dee0bffa982cef59fb13cf0a9bb8c61868705. 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/ES71G2050660.