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 0x26b0bd841835ff71cf705f30399aa6fb4d5d69f444a4ac398648dd905f3f5c40. 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/dabda4b1-2217-4c18-a7e8-8c62cfd12650.json and https://artists.proofprofile.net/proofs/artist/dabda4b1-2217-4c18-a7e8-8c62cfd12650.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 0x94ea3e336b578cb020212f216a1499101fd3391afbf99b9b1e9f759ba91d1cd6. 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/SE6SA2274497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84e17f056ae3fd42a0465989b4282fef38e76b72eddea1d71edba3a4353f4f1. 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/SE6SA2274498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb884eea806fea9d905f6bbe13dbdf873e881805c916c6b4eb1612cd9efe524. 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/SE6SA2274499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3577c8ff81a0cc2f49c923eeaf2df0fa3e6d1d763cf69015785c945509d47cf5. 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/SE6SA2274500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050c91b6311af4ef7818a686749966a38da949c1c8bea1d69750089fff3cc56c. 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/SE6SA2274501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6492e4b09705dfb67525c70a4847307bb1f6aa45a4780e2d7d1696632f57bc. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/SE6SA2274502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ef3ce0b10a629c6cf165f4d796a1c7b2104ebb6a380b4e50168602b1f716d1. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZPJ32146622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fef597441802fe6936b0e5867bf262a0b950191608647a02ec5bcfc278d0df3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZPJ32146624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9eb62afbe857d2d743ba2673fcc40bc1b7d48722f3e10f7a929a4cbbe58c196. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZPJ32146625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17831bbf77f429d7e9a75e86d977833b1e3ae44fc42d479078c0880897c3b5a2. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZPJ32146626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa07bbdb44325b8d398e34405f9a8a578f0660f8f1629aa8d56dc731c532b6b8. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZPJ32146627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc8cfce6cd9872a1f85d5131aa94d7e5b14ed6d6c9d44dc12b0eb2d89ecdf4d. 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/QZPJ32146628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5cbddd180a9e73fe5e1816aac8be139a0e486a26cff6fbc07487b60778e28fb. 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/CA5KR2487762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf03f85d78ee33c863f8a8f6e77dd7bc0a01f9ccbf4223fcfe3a942924849f04. 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/CA5KR2487763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f9298d80b778b683795e3c59e657dc5924b4abbf9879147ea5163ea9bc438f. 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/CA5KR2477270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99306a7180fdd8d3c801976e46e2c4121a522323af189b04486fd7316c4bb47a. 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/CA5KR2431850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fed686b10e8008febd543e4ff7756a5b55ff11346fa68e64f4bd7722337d5b4. 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/CA5KR2424879.