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Time-bounded proofs of work - All Nano transactions require a Proof-of-Work (PoW) instead of a fee, and that PoW (currently) never expires. This means that spammers can slowly create 100,000 transactions + their PoW, & then release them all at once. Time-bounding PoW would 1) allow nodes to better track/manage unconfirmed transactions (e.g. dropping the lowest priority transactions if the election buckets get full), and 2) could limit how long PoW is valid for, preventing attackers from stacking transactions for weeks or months, and 3) possibly allow normal PoW difficulty to be lowered (good for wallets/exchanges that make a lot of transactions)