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 0x80236a0f6897da2d18e3ad25bcbf85bc9ba33d619bf9dd6cbc6e07ebec33f39e. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6908a558-af84-4d43-8af3-79129abfc3ce.json and https://artists.proofprofile.net/proofs/artist/6908a558-af84-4d43-8af3-79129abfc3ce.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 0x2412f9376ef82a7b1eec1bf8094309e14de732b8ce43aeb326a3eb981a7a65b9. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZNJY2319297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972f73a295ad67de492961fcd0637495f510433c8c5a54afd43b3456ffe4d509. 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/QZW9M2355189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb38925968ddae018f7ae7c6325e529aca668211e273f7dc3591a16a6222a928. 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/BKWBO2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f90c8b14af138086b1cae837154fa2c183e45da503db13fdd8e08172663f896. 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/BKWBO2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589101a01947c216f84dd69a5337fe45789f494f31261bf25f7da08f995ecae5. 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/BKWBO2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d1d3beb216fa4e3fec606d5a3eb3b2c6cf3063a174841ec9942bc193eca5cc. 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/BKWBO2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f90c8b14af138086b1cae837154fa2c183e45da503db13fdd8e08172663f896. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/BKWBO2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2412f9376ef82a7b1eec1bf8094309e14de732b8ce43aeb326a3eb981a7a65b9. 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/QZNJY2319297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2eae692b514156880836ffdb70691fa12601b87cf892802e8cf858251ca1442. 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/BKWBO2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95749cdaf9f730f51406d92cc3f47d98a4096ed8f559f7f3fcd77f487a544906. 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/BKWBO2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab419da044c901081c515dcf93fca48ec254261f4fe152a591e86e791a9433a. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BKWBO2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8328b3844363b057ba8cb4529f59507775580afdb3d033d09e0baab96bc1c48d. 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/BKWBO2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e48dfee1b57af55c90fdc185c95f57b56d39dbecc8976edc710d890c28171b1. 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/BKWBO2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b05837150db9f70733ccc7427098856da2b9db796021d407e1e3a75d721f34. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/BKWBO2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99cb1ec9e8a18cc3c8cf496dd463ca600bd0595be5011e297bc750a32a88fdd0. 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/QZ5AB2397963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88106097ce727d5db48b65dd64eff277aaa04e50507a6a531830811919b86c7b. 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/BRCQE2200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91621c3c61ff44ce28a2eae6f405b86dcec1c8878dcc63e0af453809f0dc5dcc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTVM2292703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54620e5a8ceafb894a7eca5679f4b63c4ce5342d3d19ce3420dc6165dbfb9fea. 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/BR7552300130.