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 0xb7c3ed4605174818e3f15f982c766f2bebc8ef711222b69ea2ae9ba21ea5ed72. 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/0c08e619-5cb6-476f-9a71-9169eca803a7.json and https://artists.proofprofile.net/proofs/artist/0c08e619-5cb6-476f-9a71-9169eca803a7.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 0x8a56de2c160d394b2a6a27b93849fbdb6643a66fb2809e0f4b07b102b514664e. 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/CA6E62300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x259f3035c37ec0f2a204ac5ccd21f1decdaeac91469396a7c27f8bcf95617cf7. 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/CA6E62300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae3f9951c93ae846a89b414481c46191eb0b47bdfabf41851606ed86ffbc1b9. 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/CA6E62300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc713fdbb71e98066021de865332fa5d673fe3027db9197911e374931f02320. 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/CA6E62300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d7a797b79accd5182b2bd2da5cb09faf32aa07bd5554981d721058edcbaf33. 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/CA6E62300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0b836af3d8dcc452a1c8b9f498ba90756b2c2d1c68b39bca55d75903976cce. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/CA6E62300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976279013895306e82170c9495dbfd2cc3195bf2662b2c15767cd501af601ada. 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/CA6E62300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ec0ee5fb4ac7b5ee7b7bf92fb7d1cb051b0698c053678c2639ae25c6df4a43. 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/CA6E62300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a56de2c160d394b2a6a27b93849fbdb6643a66fb2809e0f4b07b102b514664e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CA6E62300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02530b6d5c9553034dff07abebca6486f6be285a20299c5a258b5f31cdbea58c. 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/TCADC1714964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf243559d58247dc16154047afa48386224454dbdb27be086f708f7d79201fcda. 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/CAC0C2200795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48aac8c4b7f1c85b6a62a26740ee8a4f8816c221598043152bae4784b8c4d80b. 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/CA6E62300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4e610e97ba203d8aa1a3638f0c42a98b470e1785bb496e7cdb13e4714998a7. 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/TCADK1893930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa882d56aec965d8ec59417cea1b1215235f7e3221d62ce96bec56ecd528055d. 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/DGA062215859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf243559d58247dc16154047afa48386224454dbdb27be086f708f7d79201fcda. 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/CAC0C2200795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2bd364c99f5eb7af85720d46fb58ba1d06abef98301f181ceffd318fef0aa51. 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/TCADI1706720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222ca3dca48678bed70ad845adc14e6d1b1add7f2e78ab17b85b5f8699a287fd. 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/UST8K1863586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x625a16b14f1610a8788d24da71d343bac1d9f290abd71f7d8d72f16815ae764e. 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/UST8K1863587.