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 0x8ffa778d39e06a0704580fda1249cb1acf5be51a23ac9d1ab67a8b3dbc82ffcb. 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/06922e76-2c9e-4c2c-a3e9-1caff0bc3d80.json and https://artists.proofprofile.net/proofs/artist/06922e76-2c9e-4c2c-a3e9-1caff0bc3d80.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 0x2693185890722f0b2c5172f7a52403fdbd1284eb9b95fb53ced2cc220c26703d. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/US7VG1853738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef8ee10d07b57c4e5bed1339c2a1b0bee34cfc89df9a9633e76723763495769. 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/USWB11503806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050eea2cad5a3fefdc84d2a402a6af19fe3d8d9bad2a39c33d3ee3d107fd4cfe. 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/GB5KW2400463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391b510835b8419259ff1eaf29bb5797b1a9db23d4820b6983f9e6e1149eeff4. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/QM24S2104665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391b510835b8419259ff1eaf29bb5797b1a9db23d4820b6983f9e6e1149eeff4. 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/QM24S2104665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c3f89dda072cd7641c20477dc4be502e4f3887e7612e3b21145cf5165b47c0. 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/GBDLM1900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5d72b05447fd447ba733360c884cf38dc33b5e7eac2a5447311824c2568cde. 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/GBEXH1600103.
Toolroom Radio EP744 - Presented by ESSEL
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566f7d58c48bda595135833ba5ade446306d7f64fa8f68e3aa4dac53afe24c40. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBJAJ2400919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06bea73eb03f5336020c4f3bce96c1e55b869c629930af9b513e5d654682fdea. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/NLZ7T1800003.
Toolroom Radio EP730 - Presented by Mark Knight
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282561a12a072435c3cc13dc83f16a98130fa6e963f908511b1f3e979cb4a370. 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/GBJAJ2400447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050eea2cad5a3fefdc84d2a402a6af19fe3d8d9bad2a39c33d3ee3d107fd4cfe. 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/GB5KW2400463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a090142aaa1d9c5988df3cf2ffe016a76c0840bfc9bf417bb2c6dad60f1e85. 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/GB5KW2400464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3726cd1a74b7947bdb3b6406532b45436d60897b7d557fdd9a140e25cf7a2e14. 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/DEPI82434537.