{"document_id":"BLC-STUDY-0539","slug":"bip-331","title":"Ancestor Package Relay","authors":"Gloria Zhao","year":2022,"date_label":"2022","publisher":"Gloria Zhao","paper_type":"Design paper","category":"Storage and networks","topics":["Storage and networks"],"source_url":"https://bips.dev/331","source_label":"BIP 331","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 2022 study. The study is the reading. This page does not add a second essay.","doi":null,"rights_status":"Official external source only","source_status":"Official source","use_status":"Metadata and commentary only. The reading is the study page.","licence":null,"licence_label":"No licence recorded. Rights status under review.","full_text":null,"full_text_reason":"Full text is not published on this page. Public availability is not a licence to republish a document. Blockchain Lab has not recorded a licence that permits an HTML transcription, a training set, or a retrieval corpus of the paper. Text on this page is Blockchain Lab's own wording, or a pointer to a study that is also Blockchain Lab's wording.","editorial_line":"BIP 331, Ancestor Package Relay. Peer-to-peer protocol messages enabling nodes to request and relay the unconfirmed ancestor package of a given transaction, and to request and relay transactions in batches.","canonical_url":"https://blockchainlab.com/whitepaper/bip-331","record_url":"https://blockchainlab.com/research/corpus/papers/bip-331","study_url":"https://blockchainlab.com/whitepaper/bip-331","last_reviewed":"2026-10-01","last_checked":"2026-10-01","relationships":[{"rel":"Canonical reading","label":"BIP 331 study","href":"/whitepaper/bip-331"},{"rel":"Related paper","label":"Filecoin","href":"/whitepaper/filecoin-2017"},{"rel":"Related paper","label":"Arweave","href":"/whitepaper/arweave"},{"rel":"Related paper","label":"IPFS","href":"/whitepaper/ipfs"}]}