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 0x94fe860743511a6a365b3b105f101588aeb051844129ffcc01a7f72f75084dcb. 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/c3dacf7d-2eaa-41cd-8a68-34b687bfc5a2.json and https://artists.proofprofile.net/proofs/artist/c3dacf7d-2eaa-41cd-8a68-34b687bfc5a2.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 0x8953cbad13298c6c2107ada953cf5707b49b63a5866d662df74320585ab459d2. 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/SEPQM1100214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf610cb128c18cf72845e36a503bb018193565c44bbe43703be93fd29e8677b. 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/SEPQM1100218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43457c72231cfea89aaf58ce6018ac26aa2ac1d2c2965e0b6d3e465c4a78afb4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:52:35Z), 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/SEPQM1100221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14f11e03ea798d913ba821cb962bf0756da9eaa222ab59cfad4c7ba9f8a45a8. 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/SEPQM1100223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27f211485a4ac9d13b97e747812cbe0a52882d2e7acfb71c05b17a26273d40f. 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/SEPQM1100224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b71050227eaad36ef71b4f6567df7baea7f0a56ca697233605c55043c99a5c. 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/SEPQM0717270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cdf445418cb682b910494fc2a1a97ca2260a115269177ad3b5a589da438bb39. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:55:06Z), 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/SEPQM0717271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d8945810583100a2ad5fe994eefc727ad0b683080ac23864d14030a9a4d7022. 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/SEPQM0717272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55eab4a9593d0b58880c8f0f1ccc4c07c10fa1dbc6fef52c0d04f2a66e6b114. 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/SEPQM0717273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f5d694c902146ee4f7d2e496985081735c03119fcd9f3c67ffc358bad34ee0. 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/SEPQM0717274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f7eb2bc253e0ba3d684f32895efc246f36df1afbb255faa6ea13407ec73f38. 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/SEPQM0717278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f941fcbeddbd60c0c2ddb71bb1a09a60feee1c4ab0eb63be71bf385b7d49a6. 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/SEPQM0717280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e43e022afb515dc9d555f38b8ba05cfdce2177ce2bae403a8ebb4615c748cfe. 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/SEVFZ1102101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6bff706b950ed2485ac61784a35291e34852c911eca47100459b635687116c. 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/SEAOF9904070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f8a7b96de3399da4e009b0fe617243d267b982abcacc47f1f9448ea0a3b63f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SEPQM0611122.