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 0x3fd706570237465c86b419490cb2ec574fd645154e9d4a051db428661b117d32. 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/d2de464a-4843-4238-aff5-0f6d6ce1b708.json and https://artists.proofprofile.net/proofs/artist/d2de464a-4843-4238-aff5-0f6d6ce1b708.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 0x54bbde2da003ecd66bb3c6cd8a167e9b0cd2152d5eeae8186645b28235422cd3. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/USQY51256345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54394616309570db9d65c788e4200bbfdac5186d1ef3903d136d64fc8e34aa35. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USQY51256347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e66f57c0378a20f70b83e828c7f5dc4465360f1c5e8cd67ee7dfb9ab968d8f0. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USQY51256349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf01716fc1c9aceb4e98d5b33d5ddfc14243c658295ea7851729cf80af70d2e9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USQY51256355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x436f96221d5fa7695890223888044e323fde38480d8c58dd5126cbe586d4da15. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USQY51256356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6faf0a9b3b9dddc8d2f728ca1c244d3b9adafd4776106fa69250d04b6be3ce7. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USQY51257460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918ee460f94e2fe13d5e7b1439678a79c7fb05f85b9f33cf5f871c115d4ff89f. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/USQY51257462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1f8b644aa584123c00dfb86c0b973d83556e013371cfbf04bc1e0cc7e6127c. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USQY51257463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de62ec1b24dc71604c77d63f35357c547f74117719d239fe428709e7d1c549f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USQY51257467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be54944b61bf5ee558730df920af4699878c7aecf77f6952beed8ac005aed35. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USQY51257468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715e530c30f9fc3c2343da4f27ffd1eefce7639c181e8e24f01e85c501f590a9. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USQY51257470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509036b4ce58fa2172cd552e8416b3b3a77e9907ea3f589556f7c78179d7ce19. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USQY51257472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56991174a75b2aaa9c558fec6311822b5fafb1c9f6be456f2f30003ee686b6f. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/USQY51257445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6600db1cc3f340c538df0e15e68dae98516c7a6254f36737997d46ff9da1c1. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USQY51257447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96338f46342d07724d92eb4a1ac34a3614655dc454abe2c31a92fa66093b038. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/USQY51257456.