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 0x24e44d49e245c897c7f93781f1dcd5526c696a9ab215b8f10de6fc3c6bca3b1c. Chain 2 (Bitcoin): anchored in block 954028 (2026-06-17T01:08:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39e0e1f9-19f5-4ae8-b78b-037aa3af5b44.json and https://artists.proofprofile.net/proofs/artist/39e0e1f9-19f5-4ae8-b78b-037aa3af5b44.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 0x9d89473acefd883ccee364b4c5559068a5bae41ba97d8cab6fd253f8deed0ece. 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/BRM9U2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8036c888d55f6a588393bb40b1032e3335583adb2f2d32a6695b2a92f4e075. 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/BRM9U2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa206a42908a5c3ef7ec3d12bc0710d10836b2ab8f4cb0dd41e345988b2a74b18. 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/BRM301900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefea2947afd806cf956aff31e7cf9eed85e60eebfc8134ed0f2c18aecc4ff67f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BXX3V2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0d21a73ed7162090eae8dc3faa355afcebfa48f253fb6c333cbb9ad5283279. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BXSVC2100152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d3d301a695b85b8032deff86f673136c5524483567344b8180078860f16508. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/BRUYT2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x957a3c8e71f2db992efa13f7eb81907087cf050abb6b7cc92585226510a4c719. 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/BRTRB2202263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04eb68b971ecaff4a14ca10f07941b603adbacb3c695f251d953bf798526e34f. 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/BRUYT2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667819d5733822ec5655685498ae01ebad3fa864ad32193b90e32eb1b22d3679. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BRUYT2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce107dee714062a47850b5009d05314109b836251b592a9f45dd35811f582b9d. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BRUYT2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab2c9a41a48a33f7f3bace0d48cd54c15d02dcf268537152021a96aac642547. 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/BRUYT2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e77d506cf9a5a884c077af391a5d240316cae6ae64df94f95048e5508c16b6. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BRUYT2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1366a23014de999151c94c5cc51c6e69ec385f639a918bbcf83622f57d2668d5. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/BRUYT2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc7d842f2618b03f7091889ed046a475d38736d5cd9fa85a29757786aa35d42. 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/BRUYT2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6406b4588ffd808bfd8f80d3bf3d1f955345d3a79869585a5309417bb22c3c98. 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/BRUYT2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017e36c6585b71d11383517d7828876610b4db0bd34bbeaad3f3ee7b62ab8a98. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BRUYT2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b5e8e2bf622450b1537a090a6b37431b35247197d787dbd43a3663d2f7c62f. 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/BRUYT2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9bf14aff045f078113664a5e369c40895ce6f409caefc0b9d27af9c7b86d17. 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/US7VG1628633.