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 0x83a2eb5781cab5ecf24f7f0a0a626cf3a81818dfb85610197fdcc258fb61f446. 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/14254ef5-8f7f-4ed1-9603-c142f2d80e1c.json and https://artists.proofprofile.net/proofs/artist/14254ef5-8f7f-4ed1-9603-c142f2d80e1c.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 0x79baf1711fbe684fa0c9dda9f2444458b68964f1e7c27aec5cf2ba097334a11b. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/US7VG1714263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9142d180735bf1917d7c5d79cc00d24344473b195a742a3f376f6c36bab02033. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US7VG1714264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525e5ebd2f41f12179271456ca69134b4f4877b1b4f508e0382ee9f61786e664. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US7VG1714267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0476f85dce9adcc9aff0e88b0549fe589edc1466ad40197b15ed680e10d9b5d. 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/US7VG1502607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b04d39906e203cea618ac1896eae1b94083795df86b1c6a3c338ab53ec7c4b. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/US7VG1502608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4520fd7b7bf42bddd78de146ab79a793a2a0f00417f26a78d2ee7c51f1ae2d9c. 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/US7VG1502609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a68f69d9864c1a12ca13a99e0b2e432713343db2b2923eac107dd422fa70bb2. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/US7VG1502610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1697f4632bc31474e8e5ecb1fa181f6303985f9dfe15337570369119d63ef69. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/US7VG1502611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196780c02dddf8ffdf211649be1128311c9f1ab6c44d89b3d48453074ab9eb23. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/US7VG1502612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b82bfe4832eab4e6791b00e250b685ef253c7dcc283e259da0c382bd19ea35. 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/US7VG1502613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd310610ef97ecd98a8ec3c363e832ba3c6a4504ae6501b68cb425b6c57c0c1. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/US7VG1502614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee11d17e19ed93f72f0fb0925334860517b3c432fb30d8b335604d3c846dc7c7. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/US7VG1502615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53a41b85d92c0a014c2dee9c18c5f2103e6e2e1fa3191ec3329054a3046e842. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/US7VG1502616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc910d058e5e9da5544e23a598510d58a8dc6b494ccb89851ec5e837a31ccda7f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/US7VG1502617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a2f03b77cc4c6d2e0177b7b7e3ed4aa28eed4b3237fa9a2d99fa1917dcf775. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US7VG1502618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7283ff73defa99f46e02cf3c2d1cadc2f29c990af72caa398fcb642d620d5385. 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/US7VG1502619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce91ff1a7e6f99b0b553dcc124545a94dabd3edbc33db48d7d88b61c573d5fd9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US7VG1502620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd353fca3ddd52de3311906e3da58c730b5115e758c3d429a1c82645edd8283. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/US7VG1502621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2a88c4915f57ff454bf36efda27f1552dac8406c5cc9e502169f1b2a2d177d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US7VG1502622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73df79617f7fe64f1d96f14303bf552148478814ebc889626a7ae2fabdac24fc. 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/US7VG1502623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8666445a1d2ec610dc4c926b3db3891b3cc068955dd9ed69d8ba116863833b40. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US7VG1502624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb9b3968f634d83166fb69e02a919177df54724d6f75969b73f94640cd2540d. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/US7VG1502625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02dbd2bf65b5a076a4dd7f1fb0640fc6f7a5b80e2a5c2559115d9cb67ef2d3a5. 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/US7VG1502626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67326a7d57948ece31b889df3147bce21887d18c2c627a7012613f7c809b2b8f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US7VG1600611.