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 0x34b91e7d055b80caa47876aa9cfab8ee8acda8ac99830555642780739fa47d0a. 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/228dff69-129c-4e83-ba7f-8d3aaded14d8.json and https://artists.proofprofile.net/proofs/artist/228dff69-129c-4e83-ba7f-8d3aaded14d8.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 0x32f0ecd0d22801e04ac937ccf4edf345ceb58759e041ac691110d7f5cb51da9e. 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/NOGTA2473110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604c55dd5af6202e3f3d163316a724ba68577ca299613efe63a9b08f8e4fb67b. 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/NOAJR1600056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f898a11f3fc395100ca1ea813c7f6ad87c08bd98b8f22294bf623b380d79bef. 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/NOAJR1600068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9421b8cdb1fb9e57fb3eb8f31cdc62ba5ef60b9ba3e45f9a82cd31e354b3a8d1. 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/NOAJR1600062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700d7be061b53b96fc140fb2c751b5751e76ba572af0f0003d2146cac5fc5944. 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/NOAJR1600065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1c3c6c821fa70a90966c357464d4bb7531b9f05321ebb6fe5124fa10ef631d. 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/NOAJR1600071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf6ad2a53310a03dd169fa7ef5a24e56cb5f4ff873da761ee17229aa407879c7. 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/NOAJR1600058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cba3c9b595f4f9564242c536bc52660378da818bbd355fa1ed8aaf6dee07658. 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/NOAJR1600049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db8d4d3c4a2720e2fde5aa57af1170b970b62976cc84fea22049c1f097664b7. 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/NO2RR1502010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87057effdb3b6a902b942fd599653ce99573dfe59aa71d0392dd4dce33999280. 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/NO2RR1602010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57742d91b493707f1eaaa6915b1c03c6b0884979e10c4cd579866381a83d552. 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/NOGTA2478810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf96de01cfc4fadb4bc6d7b8d2767764da7c369600ebfc94a5eb00a2eb72b4d98. 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/NOGTA2469210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb64dc233ab6591bf087e35f16ea2bfb2590f62f449de2335c2d1b750675405. 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/NOGTA2468310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9249dcd1cdfbc3834e5f55fda951d22ab4b959d63c5eb93d2a88b261d6fa7a4b. 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/SE6A92020727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833f0fd7b4218401d9b8d5ebae15b0fbf19d6004db0eb1568d6d6ec2f49d0370. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NOAJR1800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fbc3c8a088b38327e326dec14571f25e7187acefa7390447ff827adfab22de. 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/NOAJR1700018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x604c55dd5af6202e3f3d163316a724ba68577ca299613efe63a9b08f8e4fb67b. 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/NOAJR1600056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503ba4c5aeec2f2df2f56171ff3674782fa3df25d3250f1763ad5769eb68d47d. 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/NOAJR1600073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3de6bee31797ff017fc6c64e5f434aac0e59f7db30dfb3d3133ba2ec75ce7e8. 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/NO2RR1607010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ff3fda9e36c178948af4183282030b82966ffa7017666e8ad7ea5656568405. 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/NO2RR1506010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399b8a7b0d8c4231c3c77b7a45989586eb257debe1dc61abee00139c46cb5f89. 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/NO2RR1506030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62382433e714318a81e6ceb4b4f88dc341351c6a96098339459e1c24a094d4ec. 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/NO2RR1506040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bbdd4319322418042d959ac1ddfe87cc14294ed04805651c8698e1e49d94cab. 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/USCGJ1369289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76a78cea17a2f381b6100ae264de987bbeef48486004d3ba5e35eb2e157a5e6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USCGJ1369291.