thumb|Papierkrattler masks at the Narrensprung 2005 Carnival parade, Ravensburg, Germany A mask is an object normally worn on the face, typically for protection, disguise, performance, or entertainme
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 0x3d23d605be65c2ad176deec8e193e63a60d6059f0b02cc00d2e4863f930884d6. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/601236dd-9929-47aa-aeb5-9126014f0c9f.json and https://artists.proofprofile.net/proofs/artist/601236dd-9929-47aa-aeb5-9126014f0c9f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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