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 0x2c3c74ee07d143669e883918b86e6998e2c4ba19c20602e0b358a928eded7900. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00d94727-ceb8-47e0-81e2-c986290ed1c9.json and https://artists.proofprofile.net/proofs/artist/00d94727-ceb8-47e0-81e2-c986290ed1c9.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 0xbdb297d9d6022ab6e81d8c6af9dcdf2784d608bb273048579089be6d07d08051. 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/QZFZ32574255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3ff839af9aee804c0016d11392c5074265c4ec802bc3fc41a500a937216408. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZWFQ2489993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa269e907ec530f4de2f533126a5f540b8341773d418ef9ff78f3b55e20efc552. 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/QZZ7P2417531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14300b580304271f4efa06af0d761e90b6eeee9bd1b81e77f2c99d47e604170. 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/QZFZ32574257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cbb24f4d51ac4f8fd8d92731a2b40e89989bdf712175e0951a4f9118bda4c03. 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/QZFZ32574258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0fc766585722da0d9f2c19fb0ee9ed9c6f3da9ad2530299fd8d0473dcb089a7. 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/QZFZ32574262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3ff839af9aee804c0016d11392c5074265c4ec802bc3fc41a500a937216408. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZWFQ2489993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3031a32098fd2e3d3aff7b7359012849485c67ec0324d7ace0842fbafe4867. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZWFL2305772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff8b88b5723f9354e157dd6f3d3b60c695d62722a8876d90bb860884e630a93. 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/QZZ7Q2443621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9d22d1df3ba57783f8c4b0be927549da2dbac929d029a69e9b3ee819772607. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZZ7Q2443622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691003414bb24658efbb2fea69472c8071f32768a3ac5eb1f277af36572bc4e4. 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/QZZ7Q2443631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6297a590fa23a6256d866a36860a2659cc309422b995dd0ea96249ff68a480cb. 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/AUMEV2404442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x777c9f46e98915d9e7e2bf49b471d69ff9ddfb9b8246a5d7f989704afcbcc2c8. 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/AUMEV2404443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f27bd42c80501d3ebf452cfe5a4de7bd263261e27cb7450d520a269998cbe9f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/AUMEV2404444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x742a9259e2b97897d0d48def800a636341f654630ae32b9e861de848676402b5. 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/AUMEV2404445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6aaef28ebe7e84fc153e41f076e1061d57dbe6abf97f48610499a07e9bdbc72. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/AUMEV2404447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de5635a5c8141c4bb821b569297de4442abbc8cabbcff0c421ea89f95d87cc6. 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/AUMEV2404448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176055255a53b857379effea9e0810abd1c616ecdb64585e2bc7ef7c0709ce94. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/AUMEV2404449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a56df3025a2ba0d47285f709cd292dffad28bccc470431b3030f3b49b4ac964. 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/AUMEV2404450.