Toybox is a free and open-source software implementation of over 200 Unix command line utilities. The Toybox project was started in 2006, and became a 0BSD licensed BusyBox alternative. Toybox is used
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 0x948f7268eb4e33e672f3a57d9bf90c319b1e737c7e2f9e6a6a7fd8c3dcec5c49. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d629f675-ff9b-4719-aabd-cabb3db6d8bd.json and https://artists.proofprofile.net/proofs/artist/d629f675-ff9b-4719-aabd-cabb3db6d8bd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).