thumb|View from the Ivan Vazov National Theatre during Digitalk 2012. thumb|Matt Mullenweg and Tony Conrad, founder of About.me, at Digitalk 2011. Digitalk (pronounced "digital kay") is an annual two-
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 0xa0d9600ad3dc30a271b2b3abfc9806d56e3bd3ab19d0da3534f955dfd2f28f87. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9afc57ab-963c-41d6-94b3-c363c3c92f88.json and https://artists.proofprofile.net/proofs/artist/9afc57ab-963c-41d6-94b3-c363c3c92f88.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).