District B13 (French title Banlieue 13 or B13), is a 2004 French action film directed by Pierre Morel, produced by Luc Besson, and written by Besson and Bibi Naceri. It depicts parkour in several acti
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 0xdf99bff1cdb46ca5962f2ef9e219f1e74e005a16e0f2e010eda6a10a8d8bbb33. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e06560a2-19d8-41ab-8fad-d8606a70e711.json and https://artists.proofprofile.net/proofs/artist/e06560a2-19d8-41ab-8fad-d8606a70e711.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).