{"document_id":"BLC-STUDY-1683","slug":"eip-969","title":"Modifications to ethash to invalidate existing dedicated hardware implementations","authors":"David Stanfill","year":2018,"date_label":"2018","publisher":"David Stanfill","paper_type":"Design paper","category":"Consensus","topics":["Consensus"],"source_url":"https://github.com/ethereum/EIPs/blob/master/EIPS/eip-969.md","source_label":"EIP 969","legacy_pdf_path":null,"sha256":null,"sha256_note":"No hash is published. This build does not store those PDF bytes, so a checksum would be invented. Where a legacy path exists, it points at the Internet Archive copy of the old library.","version":"Source cited by the 2018 study. The study is the reading. This page does not add a second essay.","doi":null,"rights_status":"Licensed for redistribution","source_status":"Official source","use_status":"The upstream file is mirrored at /primary/eip-969.md under CC0-1.0. The canonical file remains the source URL. The desk study is separate.","licence":"CC0-1.0","licence_label":"CC0-1.0","full_text":"https://blockchainlab.com/primary/eip-969.md","full_text_reason":"Mirrored from the upstream file under CC0-1.0. Desk wording is not part of that licence and is not a training grant.","repository":"https://github.com/ethereum/EIPs","editorial_line":"A desk note on EIP 969 (Modifications to ethash to invalidate existing dedicated hardware implementations). The file's status is Stagnant. The note records the text. It does not measure who runs it.","canonical_url":"https://blockchainlab.com/whitepaper/eip-969","record_url":"https://blockchainlab.com/research/corpus/papers/eip-969","study_url":"https://blockchainlab.com/whitepaper/eip-969","last_reviewed":"2026-10-01","last_checked":"2026-10-01","relationships":[{"rel":"Canonical reading","label":"EIP 969 study","href":"/whitepaper/eip-969"},{"rel":"Related paper","label":"PBFT","href":"/whitepaper/pbft"},{"rel":"Related paper","label":"Tendermint","href":"/whitepaper/tendermint"},{"rel":"Related paper","label":"HotStuff","href":"/whitepaper/hotstuff"}]}