thumb|upright=1.35|The Major Arcana in the Rider–Waite Tarot deck The Major Arcana are the named cards in a cartomantic tarot pack. There are usually 22 such cards in a standard 78-card pack, typicall
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 0x19d4543288362bfb5f60bb1636bbc31aef9e09e833d33b5cd141d02645d85c33. Chain 2 (Bitcoin): anchored in block 953928 (2026-06-16T10:21:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e3baca2-ee10-4dba-88bc-a014bbc16b4f.json and https://artists.proofprofile.net/proofs/artist/1e3baca2-ee10-4dba-88bc-a014bbc16b4f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).