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 0x4e92b04ee90ba0bc23396c4129ac26c777a405c262ab46ea4cecc4c802014357. 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/6c8648ad-9797-4bc9-955d-8fc68f638d3d.json and https://artists.proofprofile.net/proofs/artist/6c8648ad-9797-4bc9-955d-8fc68f638d3d.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 0xb49573be9747fa48370a35f5a0a89232c757087c2ab5d370a345539789a7f4f0. 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/TCABY1404872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c82142b27a52217094ec6fe87e943c3b0564c23a73ae6d440aefe0f7058fdd. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/TCABY1404873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318f271b69052e7372a3cfe7cb0b6f58fb940b6f9bd143d2a6deb5e54c87505b. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/TCABY1404875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801853d7e1f21907fc4ee4d9c95673d8f29d3f957ba4ca93e7911678b2f45118. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/TCABY1404876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39bc69a4ab1ef06d5b2d79e7ce6d278d475d33e0780cdb4f2e6e7fc95a340f2. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCABY1404878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96767520f0fbca355ee8c58bc42453d356506b55de588916ae74cf3738a19dd3. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/TCABY1404879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb91e37691935956c459541395c3e7242c7b711356f3e13aeb3c3f8bb25a477. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCABY1404881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83fcc7eb52b415d54c64627d2e0a4f576196262e205adc65e7adbcddff1e30e. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCADG1739069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d4aab1f3c1d77b9f2500ef66ab5a443c4ffe733c0d14c8e0c1b0504e33b008. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCADG1739123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90cdcb7c3dee3f7f7b8fa15954d0ef896055d1c00e06df299033c30e6dac7492. 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/TCADG1739124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea659774696d0b9bb94ca851cfe5bf24e0958c527af8825e2272d41281caff6. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/GBKPL1971653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee272dfdf7b2b78d812cd14b885393e74f1e0748dece8f599c86fb66d7245b91. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/FRR642100514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe49116bf050969fa156e98410a5c02ef705967333098552507e7d2de453ca704. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FRR642100515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06307ffa133934e6d2bd3c3ccaac4c9cca0bd12d0ec0be8099c3820edd477eb8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRR642100532.