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 0x887e942b762ced9b0b6e613e9e7cb778b3735133a28d02add7d15854e4a4dc3f. Chain 2 (Bitcoin): anchored in block 953662 (2026-06-14T17:28:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/54d32b62-56a1-4df5-8fc4-20fbe6b697fb.json and https://artists.proofprofile.net/proofs/artist/54d32b62-56a1-4df5-8fc4-20fbe6b697fb.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 0x0a252e5990dfea316711cd04e365bc25c067c5dc450bc9684e3923b85eee36a8. 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/HKG732127335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4af458f07f75b38c2e3bf810d6bcbf5a3dee1f8492aae192aaecc3bc88f75d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKG732127337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48d7fec36abf5410281e90710055e1e752eb1266896bc4ffce961942747a761b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/HKG732127339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96bcb0ab9599c18e038a73b7a3a4b4cdb4a3b1ebe7e149e4807864dc8b438fea. 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/HKG732127341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113eae56a36f2373d4bffca1a8a57d7b545ce29315d81da61e59441ab04e1cb7. 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/HKG732127343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7925545a5825a03e59aefd8a4e6d15cafa0af99b71f4e329a8ec404a1ad4fc1e. 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/HKG732127345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e49ec6f4bc036584e42e73688a2feccb730d411e1241f497f72127f5cdd27d5. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKG732127367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf3a0686129cd19f2e3883395c5eaea9bff1f57bdf0e06015c9f00dde668e14. 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/HKG732127369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5074c9774037a1f9487e49b66b562508e558ab99ceeb48710f356c2b068ac08f. 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/HKG732127371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe021e256b0b974f532fe6a1906d1aab61fa95043b647e736e16c3a7ab6e3596f. 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/HKG732127373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b539f7c45ff448caec50f9ef10ef5b536a258f1832d660b8915bd3b927827e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/HKG732127347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1053389136b6dd3477c6c769a54ffd8035c423b1fd052062b1d7d75872a0c02. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/HKG732127349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cb156bc54cdc192f69c7619e194d455a3fd3a91a36356f6e0162e25a782f93. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKG732127351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc5fdbe80fa39316649be510b37f84d7d485f379378b45a614b61759c249f90. 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/HKG732127353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3537194b2c0642bcfedfd9d196608061ad05eb04d0ca078b4e78d8dc29a3c67. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/HKG732127356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b30303c12216fc946e3a24d895871961b1561c66f24812936fb65dd69f416b6. 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/HKG732127359.