Den may refer to: Den (room), a small room in a house Maternity den, a lair where an animal gives birth Media and entertainment Den (album), 2012, by Kreidler Den (Battle Angel Alita), a charact
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 0x26fa722e942932e97adcac8768395dbd8130202b3975779c4a0e87c19e149fc1. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/091fc4fe-ad2e-4e1e-955f-0c87672fcaff.json and https://artists.proofprofile.net/proofs/artist/091fc4fe-ad2e-4e1e-955f-0c87672fcaff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).