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 0x49e9b8e02a2d41be02dc502b2a2c8c56d4a22acbd47bbe404af3a0b59aabbaca. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8dfef49-4369-4efb-ab5e-83d26ef85619.json and https://artists.proofprofile.net/proofs/artist/f8dfef49-4369-4efb-ab5e-83d26ef85619.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 0x99cd954889497098b692f20d04a2862c67bf154539827746ad87ac6c44bdfb7d. 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/QZK6H2467181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff404efc7f05aa91cf9819b338eb7813c7a1e0d02e72cf900660a0d4f3ae8e6c. 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/QZK6H2467182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8caba22e2f25cdbe683316ad0400afb90d3231fc0ebe2156533fabcc64f7a5d. 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/QZWFN2385674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c28c210ea5bba27cbbf4990bdd94595f421a93ab7922e4eb56a896e6cedb986. 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/QZTAY2444855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24f003536ef6a38502e1d2effaf7aaf0236a175592b6cb9e3a9682154e06035. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZK6H2472975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669ea8ecd10c767460e41ad1ca9009017cddfe3ec5e95a51e64fc8fede643d16. 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/QZK6H2472641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c9a7f8c1226db242a274565d31f770c8de96efa60d6e164db47242edce87ca. 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/QZHN72498092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888964c4359ab9d1e884f6232ddbb350e15e23050504d4ab44e10339f2e9917a. 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/QZHN72498020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e67666651a142dedd3e0233313fae3736e8e98601485107a6d555027c024dc. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZHN72498065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360e88eb40e96a8a55b17c929e7265202eddefa875054a019fdd3eb807ba5673. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZWFN2386314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf752f7156815f42bb501d1a58b765ab337892db5e61391f199847b2f6fecf64d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZWFN2386835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea96a77128a80e987c9383c4fca7ef38397aa26931e7ce91a4777ec1e0c138f. 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/QZWFN2386325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488c8ff2baa16a57c16a047973610284ed71ab0a6b15d23b03bf156a445e50cf. 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/QZWFN2386317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88cc16debf86d0feb9acca5ccf565a92149ff137af2d7ba90c3859c6ad0b74aa. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZWFN2386316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05cc25f2fe356632f2b6384729f8d9a916970a63ac980bad817a4a8fa1d94c85. 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/QZWFN2385668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd49bb2e320f45a0fe01b893802ef45502fcedd0ac60a95cdf0e0f1f287e9dbf. 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/QZWFN2385663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbfffee93cff819fecc5cc2475a7f71aa1f7701ec1148b5da1156ee833441fa. 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/QZWFN2385664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ef5f7e4b984de1568064c7d6f9768947cfdabb31d5691c1ab8892bf439619d. 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/QZWFN2385660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0baea8d48ad85e8182e627d085571ef6a42b2ebfd145328a7cdb6024bbc901. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZWFN2385650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd9a35aa6911eb4df5d43aecd08700c50b71fc9ef414ee7540c084e97a7a05a. 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/QZWFK2327478.