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 0xad4185349a75cf86d9b211e9b83d784e23f04618628c5eb86c8b6aa5078ea049. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4a15eba-4b4c-4cb8-ab6a-dc3bc3df6000.json and https://artists.proofprofile.net/proofs/artist/f4a15eba-4b4c-4cb8-ab6a-dc3bc3df6000.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
City Lights Sound Effects 6 - Household Sounds
City Lights Sound Effects 7 - Office and Classroom
City Lights Sound Effects 3 - Transportation, Emergency Sounds
City Lights Sound Effects 4 - Natural Ambiences, Water Sounds
City Lights Sound Effects 1 - Humans, Animals
City Lights Sound Effects 5 - Foley, Guns, Industry