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 0x9beec78719471f1aa7dee06130f9d120245aef4ab1c864a9e6d9449415638d9f. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/90418aac-5add-4b5f-907c-20b52933f999.json and https://artists.proofprofile.net/proofs/artist/90418aac-5add-4b5f-907c-20b52933f999.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 0xc1e3f0de450308d54b3b47dbf880a8ba1a6042fcb115ecdb34f651eb39779345. 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/GBRKQ2333672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f31ed7e3dc7ccb0295dc035832bc2b47a8077b7f73d6dfc990cccdc0a13b396. 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/GBRKQ2333677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dfa38aeb66684ebafeabe1b63afe551189eda670418468e9dc3d62a51b69acd. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/GBRKQ2333683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee1962fb9ad461ece63d1ec685e2ec3590a6239c6be95f0d882507178f6dd2a. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GBRKQ2333692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed02005b44dfd38123bdf969b9d8c4c6cfe9e5330460fb8c44761dce6eabe54. 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/GBRKQ2333700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a21826ba2e01701245d6a49ee02871bf23a342f445461a78686eb8ac6e5dbc. 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/GBRKQ2331203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa869622e3279a7392086ae3e7b0d365f3ae7b5086451642298cdee1b5d190e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GBRKQ2331206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262f73ab902250587aa6c0c36148cd68bde8396e4e52f124698d0a8372fe60ba. 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/GBRKQ2331208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd69c1f369dbb1255994cd39d58df5e93ef518d6167f906191dc761fb422c1d. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBRKQ2331215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7a8000a810edba1bcbad8a9d4d261f73abfba9e04b081f4d2785923d8bfabb0. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GBRKQ2331232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65aab1a3812aadf3f2c2e44826d27c94c8d964d193714ae30a942daa39ec33c. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZWDE2208537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa69039fd70111d761e79acc2d9c1ec529b23beac6b55b7c18d5c953a7a1f4c48. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZWDE2208687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f5326b0b6e195834d358bfd59f7e0a1d420ce941666da7e97ebe42e04e7926. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZWDE2208696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2cd5fbc92cac53e7f61cbd893683f4a177df13aedbad87cbd843785304df16. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZWDE2208706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57591ad84af0f95d30f482991c73e472f728bcd944b64c360c698c35f9a1598. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZWDE2208724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa78ab7d5b94fb31f406bcaf888ac62e2c741220896401f018c7dffe94f16cfc. 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/QZWDE2208736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da7b62384672b2dc9dc88e9332126afe27b142c8c25920b17afbedf8165e9e2. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/SKI202300072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658d73f561ad4649a598fdac6bd5a6298255ea404e3f3bd0c53be7949f827317. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZTV32229714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x221e8e505daebb76bff463ac47c0b0d7420d29ee2a3fecf6bd68ca0c8438d00e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZTV32229715.