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 0xbeef249bfafbcfe9f8ba9b10d8d83b760e9bb4901638b77db31d27e62f152e2a. 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/e1e6cb7c-a48f-42e5-ae77-60a8888e6103.json and https://artists.proofprofile.net/proofs/artist/e1e6cb7c-a48f-42e5-ae77-60a8888e6103.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 0xacdfca870954a86f9e7ec0d560c84356a6fb771cea32bdabe2e0fd1fd26e0d1f. 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/USANG2253795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f35156548e855323d8e803fd1abb75259756f80527cedc5d04d3506ed75e3a. 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/QZAKB2449232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12312d2707b49e6252a09e5bc20ff59fabd14afdd2717a96c98a898cfd20e92c. 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/QZAKB2446595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d35381d1689db1d43a3e2a6a861bec2249152d33eb5f07d579adb44c58f339. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZAKB2431975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3a4344ddc84af218c58b06c7b15c5284d18bf1a442227f6cb8ca90484edb3d. 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/QZAKB2430868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacdb5b8377c43ce5d7de9e987f6afb4d86276e5a650f58a2914c34757f302263. 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/QZAKB2429644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6936f7a134f03c5b6a4e38d49fdcdf38e7f2fe731ec92556ce81ef1270aa21. 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/QZAKB2427308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3f3a571f3d10828701bad60b252f2a09f57f4edfa7db69d3525a31ec60c001. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZAKB2415941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25e96da2339db786465a3cef4b86b51ad71eb21ce5897ffbb648aa0133113e60. 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/USANG2407952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192f222e463f0e2d2d4cdda1b66c7c295de048d4477b42bf5b3906291423c05d. 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/QZAKB2410498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7f7c64cc5569bfbf7d0f010a110c5acd3184863860932b4637144d4acb2774. 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/QZAKB2409404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2487b8b417ddae0c3d78d766376bef95df4d6d7a049966971993572749c30958. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZAKB2404357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63129251a9f0898cf26fb9e3b9e460e08b62ee2e97ca61bd801bc123d8faee28. 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/QZAKB2402829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4246150f11bc7e05962083ec2068d9c7ec0f3bb4c4fd0274b431743be7be8d7. 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/QZAKB2378825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534aa966fd5abfc20a2a5046e3a67301ac1183f9340bdbc949d548fbec8f3fa1. 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/QMANG2202210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa04b83f31ad131bc4e19f37f7c264a2d1c5ca4f9a35493164e27ce06f065c0a1. 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/NOPTR2307110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880c7697cdda8f1568929428f8171950d381db6da8448d13ad98da89f03213ee. 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/QZES62347142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc48ec68566e7a7a33084166529726fea6d0034be18dc5eb89f8b1b7886013e7. 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/QZTB32273610.