thumb|Two bundles of full-length rebar, which will be placed, bent, or cut as required by installation Rebar (short for reinforcement bar or reinforcing bar), known when massed as reinforcing steel o
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 0xe1cf9dcc7d54da0e82d2e71fc8f1822d1087c41fe8d2120f0c191d09ab252f4a. Chain 2 (Bitcoin): anchored in block 954115 (2026-06-17T15:44:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7b6d669e-c2f9-464a-b010-115b73dc11d2.json and https://artists.proofprofile.net/proofs/artist/7b6d669e-c2f9-464a-b010-115b73dc11d2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).