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 0x31945ea735dbcfafb58e2c5456c99171a4588116784993b3b5661d431bd48152. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eff6ad0e-52f4-43a6-9fe6-4f14dbef2c82.json and https://artists.proofprofile.net/proofs/artist/eff6ad0e-52f4-43a6-9fe6-4f14dbef2c82.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 0x08724787e9f1ec010c225dc782dba197ae7b325f97398106c377e52034e94fc9. 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/QMFMG1520422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d04fbbc7df7807dd5a75a614d96bd5180935e105313dc177e7021456b4410e. Chain 2 (Bitcoin): anchored in block 960210 (2026-07-30T05:21:45Z), 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/USHM21619017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb23d065658fb21b8045afd8c8422ebf351a3aef36741a4dca8c11aeecbb8768d. 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/USHM21619018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437141e46bb7a0f64d44e8206f7c1f3109448cc54f727a92983ffd8cc035ce99. 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/USHM21619019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582e855290eee90764605b1432aaf5138c1581d3e86325d35b23279029e923dc. 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/USHM21619020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe6821a968c6cf509e9215bc56b71eafd12df6660ba6cebcfc442cdee860cd5. 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/USHM21619021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47546b2a5de697a72bc673c6286845eabf0d3c258a096bb4d4764dcedf921a5. 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/USHM21619022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3729559058a09f71a87e5ae3913a0b53b3daec4778de4a05475f682eb43ec6fe. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/USHM21619023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3cb86a206996c239c68d1ff8f1556929f4dcfb656ac403a267afa899a409fe. 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/USHM21619024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677c44b03eed579babd011a97d043a2939f8d08d49b9c6a9725fb68b21bff9e7. 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/USHM21619025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf90e727dc84fe15803e7b9ace367bbc187515b458a9b67567570c822afb7d10. 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/USHM21619026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8697b11065cf9c3ae2cdfa1a74b667b2d14e013476b494ac469069a700f0a33. 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/USHM21619027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9528b2daf9e71f3c089b14411aa32a1278a04425c7ffcd979b4c91cb834ce73. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/USHM21619028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa2d1dc7883a7066eefa8258dd937e7bf2ddd6051a69feb3142b32097f5f90e. 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/USHM21619029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a835c1ccc60bda666cd7b10d3cb73bf28cb49817d8a8372db3562e46607a8a8. 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/USHM21619030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac755ed5333e935cd4358cbf007aac228b9f194ae8a537c6e20b1de408ef0610. 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/USHM21619031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1897c9cc1cc0cbf86224cb4894b0c2baa31e2f8f776791c24805ddd4d41d0dff. 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/USHM21619032.