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 0x09914528ff0f855c4df850911b0756e10ed522c24f0808238c3a3f6d7cf0fa93. 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/55ecb15e-2305-4afd-af03-a4dca273a71d.json and https://artists.proofprofile.net/proofs/artist/55ecb15e-2305-4afd-af03-a4dca273a71d.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 0x50ef88297cfb555b4fac3686f33579faa1fdc1aca3fc8c7078ac76ec427da64c. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZK6K2206980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaca3e67a9cc302119b4879fb0e968ff36249286be5711149891543c7be5125f. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T16:29:49Z), 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/QZK6K2206983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ea586384f95b9fd18d283eb37e124c91e0d3731c7681ab660012fcb3ff4682. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZK6K2206985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613e8485fc5600434b2458477ba4f27443115ba71341a0a09aed248d666a4fb5. 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/QZK6K2206987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea1c694c5a9c5b6ef3d2d91e9cabf4745d991d51f3dee4a12026f41d0731a05. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZK6K2206989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3490155136d6cb4fe52f2c80a395dc5fd86c2d51691d5096261e30dda3c1325. 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/QZTAU2259021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8d311464e24c36b1cbe9011dccee08b006f7dda93f172fc29e2dea0614822b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTBB2248860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f6bb28e0b9af343e302d7660c84141ca655fb76d275bd44f00fabd9645b3a8. 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/QZFZ32378701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc3fdc6ab15f2b20f872cc5b12c46d21a3a870b605ef6c9bea1a97dae4106ba. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZFZ32378702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6dc24a7a723bb7a5448b3f6ff7640e119117e9419b0da97f69536635b06582f. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:23:40Z), 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/QZFZ32378705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b4150a14061e7303244896432394016d59fe25eddf6acf89381430183836ff. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZFZ32378711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f57ac2fe6fd908e2c86c74ef88aebf54a90e4b469398e2ad81d364bc40d2ee. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZES82528928.