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+---
+# Publication title
+title: "Filecoin Proof of Useful Space"
+
+# Website post date
+# format YYYY-MM-DD
+date: 2023-08-30
+
+# Publish from this date (defaults to date)
+# publishDate: 2019-09-03
+
+# Venue Name
+venue: 
+
+# Venue Location
+venue_location: 
+
+# Venue Date (useful e.g. for conferences whose date differs from pub; defaults to date)
+# format YYYY-MM-DD
+venue_date: 
+
+# DOI, if available
+doi:
+
+# Type of publication
+# delete all but one
+publication_types:
+  - report
+
+# For PL authors, use author folder name; for non-PL authors, write name as in paper within ""
+authors:
+  - irene-giacomelli
+  - luca-nizzardo
+  
+# Zero or more of the areas in content/areas
+areas:
+  - cryptography
+
+# Zero or more of the groups in content/groups (should match author membership)
+groups:
+  - cryptonet
+
+# Publications without a PL affiliation can be added to the author's profile without showing up elsewhere
+# If adding one, set this to true *and* do not set an area or group
+unaffiliated: false
+
+# Publication pdf, should be in the same folder
+# No need to fill this out; just name the file the same as the folder
+#resources:
+#  - src: publication-source.pdf
+
+# Not generally used
+# featured: false
+
+# Not generally used
+#categories:
+#  -
+
+# Icon must match a known icon in /static/icons
+# links:
+#  - name: Publisher
+#    url: link to publisher
+#    icon: link
+#  - name: Download PDF
+#    url: external pdf url
+#    icon: download
+
+---
+
+This document provides a simple formal definition of Proof of Space (taken from the academic literature) and an informal definition of persistent and useful space (needed for Filecoin). It describes construction details and a security proof for the Stacked-DRGs proof of space (SDR), and goes into how SDR is used in Filecoin. In particular, it includes a description and analysis for Filecoin's PoRep, WindowPoSt and WinningPoSt.