PAST

👥kind protocolusage storageenc contenttopology p2pentity unitaryid pubkey

started: 2001
by: Peter Druschel, Antony Rowstron

Persistent p2p storage layer on the Pastry DHT (SOSP 2001). Immutable file-IDs, k-replica placement on nearest live nodes, smart-card-backed quota. Companion to Microsoft Research / Rice's broader work on structured overlays.