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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f2dbd7a27bc22f7bff86ff07820d00cb358361090f0db434de7530c83b2145. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a6bd1bfe-31a7-45c2-8f4c-4797cdb931ab.json and https://artists.proofprofile.net/proofs/artist/a6bd1bfe-31a7-45c2-8f4c-4797cdb931ab.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786a7f15ccb461c57817bcbceba034cda4458a7e89e3896050a275de2174a616. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T16:05:44Z), 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/QZS672142457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52c33d3010055fec98a0ccc689ebfb95fc5aeab92ea145f5730248bcce75da3. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZKDK2204403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7479d9061c1761b275b4c83271eda9659fa9534cad6dffba05f8f9c42ce4ceef. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QZMHL2257089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b373ccdae9af49ce4334dada94408bb2680522e3a684eaed3fb2dee25ae041. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T11:47:37Z), 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/QZS662210230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e765e46028e322bfcb11d259222369c637566c51d44785590c6aac8fe69c02. 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/QZS632200334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f19402377faab18889174d60d4de7d1ab29fff8472b21edabcb493207f46c5. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZS662287393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52ef4ddede934a9552ad89165dd5d7f5b271cb49ea6b515753cc4bc22badc54. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZS642250134.