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 0x6242d8a2b48353cc9770145d561bc578184373f50345bffa0a8681efb5d42d63. 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/af98f9a2-b04e-480d-9e18-1a77c368ade9.json and https://artists.proofprofile.net/proofs/artist/af98f9a2-b04e-480d-9e18-1a77c368ade9.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 0x755f75651ee96454c283839c2a5c958d29609f250289ce238002450073377cdb. 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/BCHFD2300137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9729ade52918d69e50ca455fa7ad107813241e0b35abb3a8b9bf1bb74dae61d9. 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/BCNWM2100089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62d2fd78107270a1d7cb86abfcf78f9dab0090afdf1755c8b92eed8b1fa9328. 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/BCNWM2100094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63de195f9df8423683aac275e8dd01bcef2a4b4c1a13e66ba3c343aa88576e7c. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/BCWK42400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e34a96b0bbbd981ef48432038cafc03085068ef44f14a573e0f6ad297890bfa. 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/BC8AN2100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5d758b1ce91b4ff97b0bc3c8858b83a633fee72d01e470da51b0b9c6cc3ef3. 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/BC8AN2100034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c876030321b13fdda62f42bb4f1ec31ec0bc08385d8c568136ab9b4d9441c50. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/BC8AN2100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1eb80fd11926b0e6f091f6089a6fc116d855cf01091b342f74d821a7cd504f. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/BC8AN2100031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc3cbca7862675d45364ac6547bf458142ddae6ffbcc40617d8742a4768f3a9. 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/BC8AN2100036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609ada26ff73650e1f1918c9262174b2c65b2134c2eff0ef9b974379470f5987. 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/BCA2A2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4667c2c2816d4fdf91438c496d619cc763c8a0b23d41fcead12ed78441c4ab. 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/BCA2A2401184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6413026a4b18a5b2f5885bec4afdc46611f29928c4f211294be107edc40bda. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BC6M22512776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6933ff52a806a50d6a986eb571278ff3363de3cd45019cf355df137cd83991. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/BXIV82435592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10fb4ebf3108a3a2ddf32e9fb44ae66d0051ea23a4c552379d09a690654632ad. 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/QZZ8A2432925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2daa467b2e4f6c292fd1fc49cb287e12cff8699424244cd964c7e061ceb82ed3. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/BCA2A2200129.