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 0x3ed2fd3b4675cc831bc9a5ffdd9605b987a50fa9ce5ebe73166d2d7aa948e92d. Chain 2 (Bitcoin): anchored in block 953670 (2026-06-14T18:07:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5985eeb7-747d-4c8d-97a2-e893050640d0.json and https://artists.proofprofile.net/proofs/artist/5985eeb7-747d-4c8d-97a2-e893050640d0.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 0x9a8a20b238489f54204f78ee98d9cabef0dff7867c9de30b117f640759368e8c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USJ3V2376894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bde5bf75cce3c003e3f9d4eaba685dd686a9324361bd294933997e7f06ecf0b. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/BROOB2200270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76026c84c5b4f7abddebc992adf7363ead44bad1e4e7e50dae51d229ce5a2c62. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/BROOB2200280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf66b58a4ea857baf3b8f1800f6bbc866fc71ff5ccfba2bfbf322c453b6124499. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BROOB2000017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b0bc667f7e36a119da01262c9bc325ab15ea609b34f2764d43570454ca3e79. 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/BROOB2000018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b411ef42cc91b045387b2372dfee7e398e0b9be7ca37d8155ce01da2f891db5. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/BROOB2000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2567ab56480f3a5ebed1d3b9a622bd17dc9b9ef665add9f24541e521e4027b. 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/BROOB2000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb238786009596f4792b71b0a56591ae1a4d95fa99140d6ff4e834ffba96d24. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/BROOB2000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543f974dd3e519ad7435b591162e1de0669e63a10f1b9fa29beafe2a6976098f. 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/BROOB2000022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876e99c7ffad012baa441ecddbc610ecfe4fbde03fa423ab0926e14b14e24a9e. 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/BROOB2000023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e18395195b26fdb6b3afb1fb0252c08339d27a4eda154dd6201a974c3ba379a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BROOB2000024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7276016f0bc5f67b7cb875998be80f66a2af0fb5896583e73bd825bb9a95877b. 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/BROOB2000026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5308b4e1bb27b6b3714c9d46e46d0e1479ead4398af18373ae1c73e9754c112. 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/BROOB2000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e5055a71f73df2c892f59db2913445dd7f550565a006b9ab322f57a3787c67. 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/BROOB2000028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3a752a56597ac1c110bfa7c4201bc6a26219e9529b7547028a4ff3304dd363. 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/BROOB2000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04f950a3bf7126d30cff21300c2c3722ca815e6acc0d8b15db63aa0b021963f. 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/BROOB2000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e736bd7a5d15b0059a7a06bb30ba534993e3ea10637222afcd606b6e473780. 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/BROOB2000031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28b85a92d19b465587e068bd762e0d52f0470f92cafc8da1a02acced00c00486. 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/BROOB2000032.