The Fighter is a 2010 American biographical sports drama film directed by David O. Russell, and stars Mark Wahlberg (who also produced), Christian Bale, Amy Adams, and Melissa Leo. The film centers on
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 0xd011432fa71ea85b8fffb70699e32df4328419ce02f728733574956716f3c445. Chain 2 (Bitcoin): anchored in block 953762 (2026-06-15T08:21:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8301bb2-eb5e-49ce-86d5-e2f7a8689ca1.json and https://artists.proofprofile.net/proofs/artist/b8301bb2-eb5e-49ce-86d5-e2f7a8689ca1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).