right|thumb|The god Týr or Tiw, identified with Mars, after whom Tuesday is named. Icelandic National Library, Reykjavík. Tuesday is the day of the week between Monday and Wednesday. According to in
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 0x7fc70aa17afbea5f5b32f8ac4743820bf2cdc95124668817e89100df1eaa461c. Chain 2 (Bitcoin): anchored in block 953903 (2026-06-16T07:05:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14eda229-eb2c-402e-acd2-4de0264ca881.json and https://artists.proofprofile.net/proofs/artist/14eda229-eb2c-402e-acd2-4de0264ca881.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).