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 0x225ab0e0b0b952825ea146e6c690c51ba0e8cc3af70bf3c8ef575a0a1196fe21. 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/8c106b02-cb6a-4b01-a237-40c59902caab.json and https://artists.proofprofile.net/proofs/artist/8c106b02-cb6a-4b01-a237-40c59902caab.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 0xbb16312b4da90b1bc5fbe225b44dc67f029e2eb33d7cbe05f4995289e672d338. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DGA082315752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25312d7fc4bf43a68035baa08d8889841b0de3aa075af732ae4dea08016adff5. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/FRX872442940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda07d3e1fadc27abc0c63c0a9fd58140b4d708adb6f8f27414d49787ea55a0b1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/DGA062487179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4efb90e7833abff59b4e66157985548edf0a0b6d70644ecd40d69ba78626c976. 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/DGA082422975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fec557587b697b4b42bf900c85e1a743e51d9fd9a11f1c4477929d22dff1bf0. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/FR10S2524197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a7c676ea7b94976487f14db9d731b0c34c6815d6cd886b63fae0bdab23dfff. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/FR2X42583741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0928ba92658a959f445a52767378152aeab054860282b006e8122dd0a13f21a9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR2X42570914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a7c676ea7b94976487f14db9d731b0c34c6815d6cd886b63fae0bdab23dfff. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T07:21:40Z), 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/FR2X42583741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0935a9cce3c3ab1ac97501561e98237a7bba43e19e07ba1848675f684130a2e3. 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/DGA0T2416216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fec557587b697b4b42bf900c85e1a743e51d9fd9a11f1c4477929d22dff1bf0. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/FR10S2524197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e7c1930bdf851e0dc4368c60d96638064188b2bb60728965c58cc9a8735ebb. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/FR59R2502271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd7aa3cfb86830ca50ac31876ed0fc699c2296cda32064c1408dbae4961bef5. 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/FRX452501594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68aac68a0a16b02922d9aa7e4a72affe7c0a01011090814adb574924b320d13a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FRX452501595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8199c8bbc751774f0532f9e8111d6027bdd35bcbff6fa530fb11d56ff49310f. 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/FRX872530689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc74dde509305d351e69a3e9b102e7ddc5d8bf421b5c445ac2a02ba001c9b087d. 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/FR10S2598981.