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 0xcc386ddc2c5fa5715db99ef089ab2c1a12d670e4f369f3a8c6028b92d597ed9a. 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/f2fd986d-2efe-4c69-b6be-dedb43ffcf0b.json and https://artists.proofprofile.net/proofs/artist/f2fd986d-2efe-4c69-b6be-dedb43ffcf0b.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 0xa640c68279dd3fc848a56d7a446dbc45519c39f1a8c06654117d8d485beac199. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZMEN2233065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770c846ee574b1d64d98c18202c8f31abccf8a261e1959761ec30d351d59f71b. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZNWZ2227762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592a0f7651d6b294684a7897d11da4c49e2840783bdf6d3308bacfe5370ae635. 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/QZNWZ2227763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e700b3441e29418af0651074d1fad24440520fbd7f59563d840bf9cb7df5b1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNWZ2227765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cbc92fece28694f80d4b58b76da607014f4b8d51902c1fe02b59c627a84e0d. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZRP52290563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9ec304fcee89f615c4cf9683de877d03330c870a678fbbe33d8aa3eca3d718. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHNC2395095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd11169b112695e5cc7218036d7a29e3744fbfac924d2ff56b16b09a9478a70. 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/USNRS2342801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f274eb0d32c984b5bf75d1b25d1eb1f275376cb956f62a3fb03f45159bca58c. 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/QZTB32342475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ee9fd3d76be16c12af6c96a4400e3b420a46537c286666521b64a9b9f7f09d. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/QZHN72457901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969013d16b3679efcfae54a7075ce8677528fac2e6955345c1a239d91119fd1e. 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/US3DF2492619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11e0945b5d56c07533b5da47a5b6a537bd4f9a9e3194fee0aae230dedcbd7fb. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US3DF2492624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83de7d4d61a522166f28481c4c1fe30f3cd125e46aef4f0315e53e8dd70417a. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZWFG2410434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e93cbad05a3da5d3c0333cd97a5725734115bcbc4a3fca546f8cb68c09a11e3. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZMEP2524725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6464b24648d8c4ffae9c671c63f6eefa836cc95a87ae3e4452cdeec7212127. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZTB52566449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7a364b501b1dd1951233a728e37bd197b4c3dd8a6cd8402924f5447f9486df. 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/QZWFW2560291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c15f17efe4fa984b8bb472eb0d7bbd7a99bde486dcb427452a65b27d9e462c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QT3EX2539475.