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 0xc6434e83131cc6d4fa48060dba50a8617c25747e6164e0ab6723a65bba6e1739. 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/34b69a9e-c2ac-4d86-9c8a-8f4c8b1e4c89.json and https://artists.proofprofile.net/proofs/artist/34b69a9e-c2ac-4d86-9c8a-8f4c8b1e4c89.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 0x794894d1844fe6e30d669826e20164760eba906095a80cfc0f470810c7a3c245. 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/QZWFJ2376336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89eb1992f5cb5b3faa9a22cf096205b13adfc0483d7ac6a6132e39603128869a. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZWFJ2376341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1384a57f29b0181afc0f97eac842b3d354881139a3483dbd1a9014e232921988. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZWFJ2376344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffec22a59ef26dca691f96ae31f7c92ad54a714e7826b239c3bf8102f3d418a9. 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/QZWFJ2376345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7e94811abc3592ca4152cd5348c85700cb229c734d2e77100bca0447d4b30b. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/UYB292563804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd8ee85ccea3cb9414b8ee53db92718fe53a891315efda1ae78e6afd3b144fc. 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/UYD802400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6003ad753b6490a0c8dff4e80aaaa4005ac78dfd0239674a6fdff0de5ca69585. 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/QZTV32406993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01841394f73be030c953730fd8b8b0e4eed7f8c6640eff114a89cc62928e4597. 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/ARR4B2400054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ded9a96a0ab3148e6f5bc864034e88f976eaa3eddceaa436a24804996adb6c. 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/QT3EZ2405933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb416bd96ac463bd92b7f1b5cf1578d2578687a6ad2c727ed8c9e0c7439dde40d. 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/QZK6P2553545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x617e311d2eb06907cd6bca5590ed3edfae80cddb4a4a199f99b9bad9f9c8ce8b. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZTB82457338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811339804114f467a3df74486e40efd4ab00f6291b74bff57acd10b837154aee. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZNJW2518849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82bf23275f0b322395cd89dbc4d38b11fb06da508fccd7da6ce1d6715ee0c2f9. 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/GX3Q92536041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0baf78dd8d2411039d1b8b2aeef6d56e74faa93de1ddc03484f9e77eea72a56. 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/QMDA72482156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0baf78dd8d2411039d1b8b2aeef6d56e74faa93de1ddc03484f9e77eea72a56. 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/QMDA72482156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00cd8bb27882b97a3b2af52b7c138247fd382ccdd95addba6d7ca7e187fb470. 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/QZWV32509182.