thumb|A musician at a Sausalito open mic in July 2008 An open mic or open mike (shortened from "open microphone") is a live show at a venue such as a coffeehouse, nightclub, comedy club, strip club,
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 0xc9af0a3196de6a8147ae6a44c1f586e619aec09808ce1f2a735c522eab204fa6. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e7de6a73-f293-45f4-9020-2d252c14ec2c.json and https://artists.proofprofile.net/proofs/artist/e7de6a73-f293-45f4-9020-2d252c14ec2c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).