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 0x9a55b60423d1ff6c1731cde43361d2ac4727fc9675a3665be3d90bda4e0ac5dd. 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/55254658-745f-48a2-8a89-a14481519aa3.json and https://artists.proofprofile.net/proofs/artist/55254658-745f-48a2-8a89-a14481519aa3.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 0xb3a1587fb7d9e598bd3fb592c85302a7fa98e5745998327b61d6478384f3b5d1. 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/DEWT11900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404e76d2ff9429b25bbe7946e4e02f548fdcc25f78ecf1a18bb528ee5f4b0ea9. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:56:34Z), 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/DEZZ52170396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f82c3ed7f97d72170866ea6b22ebec4e9ad18079d19f51bbb2660d2f4e2e30a. 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/DEUE22503418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e16f1dfc3bc1b3475dacee217f0f26586374b4c04b0abe67b9ed88490fc429d. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:35:00Z), 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/DEUD92581100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79452a3e861ccad252d5fa7abcb589b13aa3c65dbeef026923db3d859ecc98d3. 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/DEY472171824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba5642475ade4e29a32ddce0603229b703135527919124137ae0991b1fa9428. 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/DEZC62156249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7ef8fc51e582433940a338b3c777ba0c7380faa6b432465633eb541ed2e625. 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/DELJ82002878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738404bfebe953704e1724c7893195b4855c2460861a7bba0189f399128b073b. 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/DELJ82009669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6295177951652eb26e7bf95f030bd4e3aa953ae8b0811aa558aef18c590395. 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/DELJ82009670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe0021a9515cfaa2cd0575a5b90a067ae18501198154d118166ae6202dc21f9a. 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/DELJ82009671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0530ed379a8c744f27112ecf73d0319f2c4705a4ce5750a26704d178cf2397. 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/DELJ82009672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x294b35405e276547c3d361d9512ae72b7a82b0a90492f1f1b694919cd127fdac. 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/DELJ82009673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e596855c9c69257ab031e10ea27498fc7a19c37b1f8e25c1474a6fbe4ed4d4e. 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/DELJ82009674.