right|Libro logo thumb|Meiko Building, the headquarters is a Japanese book retailer. A unit of the Seiyu Group,"PARCO CO LTD acquires Libro Co Ltd from Wal-Mart Stores Inc." Thomson M&A. February 28,
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 0x909e827b62c44d0ba3a3d0aa5538e66fb239440c09e514f5ea8ee2c795bbe184. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8278bb7-2457-45b3-874d-0cd81e72b5fe.json and https://artists.proofprofile.net/proofs/artist/b8278bb7-2457-45b3-874d-0cd81e72b5fe.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).