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 0x7aa16d8ea2765c0065db4de4ffc3823b4eb9400fd75d55d769dc66f66297eb66. 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/7aa6721e-e9c0-4f7f-b840-a3e97b5dde28.json and https://artists.proofprofile.net/proofs/artist/7aa6721e-e9c0-4f7f-b840-a3e97b5dde28.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 0x4911a9ffc050ae9e973dea3715e450323ce206bed6bcbc456c1015cf21d0d5a0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7VG2486224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9046b2297935e107371944b4c8a90a57a7e1d311a3de2201095724e7fc73141. 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/US7VG2486225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1737b0247a0addd95b1b7970b0fb7f52e6b012949cee7be1695302b365e881d. 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/US7VG2486226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf8812c7f1e504de597428bbcca47a2791312fd18f85fc8923fc4fe485b6e17. 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/QZW9L2309870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85b5f2c5770e017390d5fa80065aa3b9ca7a0add2eb11aa5f865b5c4af57a84. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/US7VG2486227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad4645a95a2953fc8a1039e5014bdd9055f49aad079c79dba5adb2ad33cea86. 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/US7VG2486228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x080d2b4235e8f6e7b91cbbcff2f1d7ba1c8b92aef3b4c1768ac1def56dbee732. 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/US7VG2486229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ec344e5a28cb55a44138199e45c8dd2693eb484a7a21deba594af9be03d3d3. 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/QZNJX2411717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57d1ea3a613604c9b12b646d55fb5f919ca4455d3450bd2470ba43f90998045. 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/QZNJW2403900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cffb03e3bba6cb238f29455a162c1c6929a4f57374fd098f5c18f98c0a6e524. 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/QZNJV2432396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefb534719463b1e9f5e35c3bad9ca4703c72575990c0655f1a1f3229645e80f6. 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/QM6MZ2428490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf8812c7f1e504de597428bbcca47a2791312fd18f85fc8923fc4fe485b6e17. 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/QZW9L2309870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34e9642c5ce163e8cbc46fafc0d1ba4a43576c03951d5a7891f80496079e753. 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/QZTVM2346726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07143d22909e40f54cfcab8663caff8e9a6acb3ebc89075055cfe4a6549207b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNJX2354015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006839fb5efa7294ecf65147bd51df4ee26b77e64e70a01ae342f92a02bebd56. 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/QZNJW2378387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32bd57aa13a339ccf04fadb670945d8456fbf762cdce82df8932d9c4a8087911. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:37:29Z), 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/QZMZ92349778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e3633f9a7beca3418ce2a630c978e57ec5fb1d470a7e40b1951f53672fb91f. 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/QZK6J2286943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb672e6ceddb446cd4a46d47afd7bc43f966e58eb8b2651cc21e471a4d1982b6. 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/UYB282410907.