Talco may refer to: The Tajik Aluminium Company, abbreviated as TALCO Talco, Texas, a city in Titus County Talco (band), an Italian ska punk band
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 0xcf46aa961666d6eeb2b3a0aea9f1324735551962ff589adb7542c357c6d60e06. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc50f7d9-f109-454d-9042-340a14ade1b1.json and https://artists.proofprofile.net/proofs/artist/cc50f7d9-f109-454d-9042-340a14ade1b1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).