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 0x5e6c112df5b5a63492aefc75d9ad616d6a4a87f3aa0096ae73c5a912d1d971c6. 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/9b29b7f0-6217-46ee-bafa-d3e6d1b7372c.json and https://artists.proofprofile.net/proofs/artist/9b29b7f0-6217-46ee-bafa-d3e6d1b7372c.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 0x0761068b6052745fc2e77664b81b8be126ab700ff6af23185f5ad66081eb46ef. 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/DGA072373542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88462579918d163ec8f15d25435746b3e7c48a82e19cc27b979ca8bfc034376. 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/US5ED2304110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd173be2ec118c4f71b49e1c1cb308e1d13e5c860882c9af829ba4db8a7e8d138. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/US5ED2303790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18674e9ec740521c0bbb409263a1202b37f172deed30815e92756698cded5e67. 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/QM4TX2395621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0cb9931a05c56ab090f134423a10e1623f2552e468589318bcf7340882dc98. 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/US7VG2306340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8206b35df27de9ec5671fb112b7e32ff5bcff787c04ae9f69cef80dbb45ae49a. 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/US7VG2306341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc493a0a218ce199a71b856ae2a7e6672cb8a9d946de464af23a1411e2e21e0. 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/QZTAU2233812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a943b8a116339b6e3e53c0d69d1a5a2ec604831ed88d91dabf7dd55d412fb0b. 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/QZHZ41940600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b8cb1b1ead076dc9322e9ff21e87ffea1bfc06d0dc83b7bedbf8b4b0b2f467. 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/USA2P1689838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae818247745e4cbaf5e16ff66b206b7ce92f762e48f4e85b34e0bf5ac7444b74. 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/USA2P1689834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8432da082cc723d3057606ac2662b7e029082e968f11654fdbd508226cda4636. 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/USA2P1689833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd52ae04f456707bbdb262af3ef80855c4a95ca24a6e46ec7e408ba269431059. 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/USA2P1689835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55be68ff4d8bbdbfd6eaa6b2e6c1ac615052e5d05b6fba31127424354988acf8. 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/USA2P1689836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89ae2d9ab2c70f6c552a0685d627473b00f4484715543199d515aa3a965ba81. 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/USA2P1608237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb52fed4c32203e67017fdbb8471e2a5e88b8bf54496cfcd3f9b376ebf3e761b1. 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/JMA271501270.