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 0x9802839bd63c467977fb5a9ec24141581aad811db63ef76fc8030da48a055e99. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12ccd013-43b9-4f06-b2c1-346ca9418289.json and https://artists.proofprofile.net/proofs/artist/12ccd013-43b9-4f06-b2c1-346ca9418289.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 0x59469fb3eed724f6edb6701178f4dab2d17114670897718ec8667b6993236887. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLCK42238216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95947eb68da0bffeb738cb8e8afc1bae2ed5e6ea472f4e5ef2988e0acdd1c085. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLCK42234283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa38669736944b5f72dd41fd417043a1511f94bdd5db75b3ac47691dbc49ce3c. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLCK42234285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917a4bf72939af7aeff042e363d4481d9015bded19f1073ea45d650086dc18ac. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTRX2358973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c10d6e61167478005710a57cc06027911398d50284a48617b6d6964399b0b61. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLCK42230349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2c21b268c61a67ed778c90657b0edf0548593228a697a105d77bf8c0c90fa8. 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/NLCK41099436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a62148809181ecb5bbeaefb118a38c5b7e85cf8a2a01e7def80ce7d2c6c0a61. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLCK41099437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb0e6643ec5ec86eee9be8acb8f24d9a07aa44f3fc63aec88ebd8aad16689f9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLCK41099438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a33ee5b94fffb416aad9b14c134042de6fc82c7cacc350ff41f6626520bff5b. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLCK41099439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536ab60ddac2b9a1fcf9b9978f80f86c61757d783f1e9603b238100a7529d060. 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/NLCK41095649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d8599c36b61efcb717c002bca1c09470e3b3892d704225a4eb2af7ab81229c. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NLCK41095650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83dfda2681e5d17b52b889e69cf42d94e9f576f4f4ba8c4d8aa754ce61f7071e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLCK41085692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e451ac8adbb123346cc56593c140002b48a1e69da57875e4fa0f7bd52468a0d. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/NLCK41086946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822145fb91256a9cb12516bb8da8bd64a6bb8cc985bc77474a94b09336eb2c9e. 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/NLCK41086947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2948f1ed7ab3f8cde0f9637cbc16da5b93778e2ba38622b62a5a83288b00a0f. 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/NLCK41086948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa485295b02521f124b28e786b3a6b36a750ae71b2f5979c7ff0a5e7f258ab8. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLCK41071917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0383f9a7a1d12b849f82a3b4735f32a788d1ac20cf31a414f49acf0f34d2491a. 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/NLCK41071918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aae1d0954996ef225a9a80a4c4844803828032b8416381b96a3428a3baf39a9. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBKQU1861576.