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 0xc29f30f1b1f9d7fd744bd4971f19d5ecfa92b7597e8a4dee0c100980d604b447. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a113c59c-2985-4df7-9b82-1f9a9b1d8411.json and https://artists.proofprofile.net/proofs/artist/a113c59c-2985-4df7-9b82-1f9a9b1d8411.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 0xf6b45b0c3e3ff220b1374cc82dda685857fa241c1324d4161186073968724222. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QZES62442541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67adc2d4fc654f90c145f779e40e9755b2490d99ecab85d7607bcb8e68d44637. 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/QZES62442542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x773532f7190a4dc2d4735f7cfabeceab80551a9d0f6356038242b3b7ef750f3c. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZES62442543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80caf71d57ea410dcde46a25c3c9166ae2fcefcc60f3d25147eedee51559f92. 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/QZFZ42491568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb41904b17b5080c4d66d33bd47dff90677dea5917d8c0ded57d1769246f08cb. 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/QZES62442544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065290c5a2bd1cd65df20d5515b3f5ac89e679f4933b0d95d219d9bd699abd14. 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/QZDA62447491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065290c5a2bd1cd65df20d5515b3f5ac89e679f4933b0d95d219d9bd699abd14. 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/QZDA62447491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80caf71d57ea410dcde46a25c3c9166ae2fcefcc60f3d25147eedee51559f92. 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/QZFZ42491568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcdc168efa0cf98398a1bdac3f02d0ed4357989d3e40965b5f8086f345fd27b0. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNWY2379664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31a889029a36ae615ef2ce99bdefe1e7ba19e77e266ee35e59e61cdb049eb6b. 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/QZES82341202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5f9ee103686bfaa79589ec7c0e07e1de910ecfcd56ea0f035069e969c0a0b6. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZW9M2277040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9face4760909b50a4d4fd5a3f4f99de6a8db2652dad9ac8db6f26d90cd6f9d. 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/US7VG2340938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41be6e5416b51140b3c2840456596ed095d28e71af7182d5b3aea6e07af396d2. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZK6N2143745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc2d22d77a08f55c40ffbab04a87f58ed9169bb305535c7cb889981919d0c0e. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZHN92116277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedce2dd9513bda521a65a8287cb27f9e468b32c5c6510e8ace1140f55b383b15. 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/QZFZ42121087.