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 0xa2ed83802ca7b5ed324092abe739da9afdc566f26d9f4cb9835690c57cdef14e. 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/6bbffa89-e583-417e-a06e-a21031430b12.json and https://artists.proofprofile.net/proofs/artist/6bbffa89-e583-417e-a06e-a21031430b12.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 0x088187157f6607db2701c3d7126d2e5b4d6c18228e516a0e5a7fe9ad9229aeda. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZAKB2366371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea7917b69f3ab29087fecc206d1a5171f7fd3d32d9e798a46969e9c2381c89a. 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/QZAKB2366373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x088187157f6607db2701c3d7126d2e5b4d6c18228e516a0e5a7fe9ad9229aeda. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZAKB2366371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c55710498a1c27b9e75978462015671bfb8ca2c79bda2186fa250b5e7bd88b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZAKB2365319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac0ffce91828f5304c7a42bb466c1271ccc65680a2e41f99535db95d9a014cc. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZAKB2366372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230bc1fabb365d8bb8456cad29750f539c9ba04b686e599402532d7cb90c13b7. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZAKB2364104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea7917b69f3ab29087fecc206d1a5171f7fd3d32d9e798a46969e9c2381c89a. 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/QZAKB2366373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c558b06353ab016682dea68fd8e7083cf6c686bf7560e2ba289565f40ab5042. 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/QZAKB2345597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ab4eea1cc87224b230bc86d5ae2ab34b8b66f705ed499e0188cf5c55871e6b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZAKB2363247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230bc1fabb365d8bb8456cad29750f539c9ba04b686e599402532d7cb90c13b7. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZAKB2364104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c55710498a1c27b9e75978462015671bfb8ca2c79bda2186fa250b5e7bd88b. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZAKB2365319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3bb6655486ea8cbf3f1ae33c48b4d6e7fb87a1559179b64984c09bc3e1e409d. 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/USUYG1414486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64f260e935d3925a4a9325dfd71053b555bacc5f59b512c68c28297dbe802d9. 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/USUYG1091895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f8a4e397a0330ac71441c6348709fab010b88c74916ef1f1672d71a9346381. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TCAFA2081937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f1df9d11d829433762447b3e2dc0551df0f71d2ef9f3a2d3d6b6c7f2e5489c. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TCAES2033529.