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 0xdc11b8e40d525aeb317a28419f80136f74c87bec10e0814156e4cd581b37108f. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6112f18f-fb54-4afb-a0db-95bf53facc35.json and https://artists.proofprofile.net/proofs/artist/6112f18f-fb54-4afb-a0db-95bf53facc35.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 0x016fa3a7647be30740a9d53bea01f3b4b8dab60bff0281f6e8e2dea0edc2ed08. 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/USUYG1037236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f0e881b7e5915e909fe6573001545c7bc1a8a49c27d3d138d93e6253ad70ed. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/USUYG1037237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ace8df9ca2631f30757c318393aaf62c8393f2947e7b10a25bd85edb6401a09. 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/USUYG1037238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612e9e52cf750a8b9b441469ae955debead7e8b71c9ca58c1ff8cb6764465737. 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/USUYG1037239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a59df34bd9d5033f93110dc1499176ef651eddc1024ae57ffc98a219048b79. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USUYG1037242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb962616652644133dd7086e13927d8cc4314a4e682d318c49b5b48422b0565a8. 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/USUYG1037243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492f42335989314cefcbb28e78f74b71fd1d0071f3f7d7ea9b386f7da394bd0b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USUYG1037245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaaa06c3d0dd9d9edec58847cf803d17f69778777f1d779bd4c0fb7927520a3d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USUYG1037246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b767bc3830d9462b6463a1ca4ee4774b55ce145e8f471f505390d9c92b26007. 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/USUYG1037247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ece770881d4e37e479b1ad5d4d24a7898453b3739141fa32c14a1a87cf299f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USUYG1037248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a821c7621905f3201c4ed90ad3c46a431bd66bb79a898b3dd58af04eb339a36. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USUYG1037249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e12202ee085320aa3dcf977acce3c8cc0791d62262d333b3a1943e14567a599. 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/USUYG1037251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44dba5789cd8218daafacf2aa71b0d28da77ecb76a72ea1f153232c5ce18c09d. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/USUYG1070941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf952675ff50dc198d03376223d9eb757c7e9b022a7d6e0807e95988a80752f8f. 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/USUYG1249089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf952675ff50dc198d03376223d9eb757c7e9b022a7d6e0807e95988a80752f8f. 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/USUYG1249089.