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 0xb232c56f566357506edd2cca897201fb98aa028b87970be283764852501065e1. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9562d9ab-650e-473a-ba40-bd994457d254.json and https://artists.proofprofile.net/proofs/artist/9562d9ab-650e-473a-ba40-bd994457d254.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 0x9d08ceb5eebf82691dfe7875a9b5e7f0919321e3e6e731b2efcb60a402a6bc16. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZW9M2263088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d57a2df50061026b25a4c929fd3d82547f3ea1e2f65c1299474862b93b6851. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZW9M2263089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3256522fd0b53133d78a8419fe270daf54ea77a022e466021e58400ec9daa3b0. 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/QZW9M2263090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbabd1ee63a74678db5689e3813322b2e1bc7f576904c87e1b9fa78b1bda979bf. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZW9M2263091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71cfdaea576737dd1b46d635573c0779298ba5146dd9426e06b8c712a343f4b. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZW9M2263092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79cf1b6a3e21432becdd32479cb05b389c6c82ac2c3dee0c37ca30e09b51b41. 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/QZW9M2263093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45daba3ccbc0f9f6d8cc057d0156586330ed3617ac66cb6dab62fece1f9d759a. 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/QZW9M2263095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59effadbc07a9f5a3cbbab99a7e542cb74d5658507be70da368710a0b229d45c. 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/QZNJY2153054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2b77f3b143376b4738aa3b87da72d4141555267521f5f56331852596ab3cbc. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZNJY2153055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d17fa3061caf602bb3335ef9ad6902d7d7a048c6a85c123406f316ecf5d442. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/QZNJY2153056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98f8083934da4503bae18efc3d196b849a30178b4d07809291eb7889a676be1. 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/QZNJY2153057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869147286b607a0eb233896f23a4a7f2523c937ad5ec79edd325a42459af131a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNJY2153060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02d351a69351a0a23bb02112b8aabc7ab2d7c51e3a5eb5eaeb0cd37046e3ef9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZNJY2153062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df751e3bb9eacd83b6f7d8eca9df1db4252d8b9632fdff4f264829e0f01d479. 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/QZNJY2153064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66de2b9cf958bdf726a003fd0a169223911b8ceea63d41eee89f6972e3a0d514. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZNJY2155251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27b8b225a5ad121d8de973a65c56bf1c9b4eab599928625a11f383c4a2ff69c. 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/QZNJY2155253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176521e516089b42a80386c3eadafa74d3e179cb26d102c68eeff86aeae65a28. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/QZNJY2155255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe706635293c20b53a6bd76fa618d383eeefa21ffe2728253e55c8b0936f3d002. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZNJY2155256.