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 0x5ca4633930e74c3c90647ba87969771db0d85e1c9c0c91c7f21a06a997f99d41. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da510873-db60-4924-af4d-70df13f9444b.json and https://artists.proofprofile.net/proofs/artist/da510873-db60-4924-af4d-70df13f9444b.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 0xbc98c86799fac3c0be8e66342f76e3e5bc39dc13b8efd22703288df5c1f71b86. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM6N22070589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee39159a4b9935c9827a9a969f7d0579345eac8d34c3ec3402c1fb55ef23986c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMFME2249050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87fd135ecf1cb8b101d256152d6c1f0ff6e6381dd0269a328a8433393adc9ebb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMFME2249051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68169fd6c7909f421854a84cab3c334a1c0b80abc28deb3c52bcac0df9b96f22. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QMFME2249054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78dc1c74dc8d17f7ad0df1a6f2aea0e9cc5de43ee1dbb85522955dccd69801d. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T11:20:58Z), 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/QMFME2249055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37c276f183c25e87fef350014ecdb9c9c8f1999c866bf765bf5137cfac3dddf. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM4TX2546640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53c5e428edd3df571b002a5ec24d87f500671fad6f0b554a96ede9c2601f4ae. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QM4TX2546641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d36b0da763b77aaffb03cf2fe9909f0206d1487658d672726d5e50d0dddc7b2. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:10:02Z), 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/SE5S62406706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22007e071a23afa8e7a6f10361c7aefdb2e8edcc022deff8c7bfda0cc5ff1bbc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/SE5S62406709.
Of Darkness And Light (Karin Park Version)