{"document_id":"BLC-STUDY-1737","slug":"bip-109","title":"Two million byte size limit with sigop and sighash limits","authors":"Gavin Andresen","year":2016,"date_label":"2016","publisher":"Gavin Andresen","paper_type":"Design paper","category":"Consensus","topics":["Consensus"],"source_url":"https://github.com/bitcoin/bips/blob/master/bip-0109.mediawiki","source_label":"BIP 109","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 2016 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/bip-109.md under PD. The canonical file remains the source URL. The desk study is separate.","licence":"PD","licence_label":"PD","full_text":"https://blockchainlab.com/primary/bip-109.md","full_text_reason":"Mirrored from the upstream file under PD. Desk wording is not part of that licence and is not a training grant.","repository":"https://github.com/bitcoin/bips","editorial_line":"A desk note on BIP 109 (Two million byte size limit with sigop and sighash limits). The file's status is Closed. The note records the text. It does not measure who runs it.","canonical_url":"https://blockchainlab.com/whitepaper/bip-109","record_url":"https://blockchainlab.com/research/corpus/papers/bip-109","study_url":"https://blockchainlab.com/whitepaper/bip-109","last_reviewed":"2026-10-01","last_checked":"2026-10-01","relationships":[{"rel":"Canonical reading","label":"BIP 109 study","href":"/whitepaper/bip-109"},{"rel":"Related paper","label":"PBFT","href":"/whitepaper/pbft"},{"rel":"Related paper","label":"Tendermint","href":"/whitepaper/tendermint"},{"rel":"Related paper","label":"HotStuff","href":"/whitepaper/hotstuff"}]}