Segwit. Bech32. MAST. Signature aggregation. Key aggregation. Batch validation. Covenants. CT & bullet proofs. Dandelion. Neutrino. Tx compression. Set reconciliation for tx relay. Block template delta compression. NODE_NETWORK_LIMITED. UTXO commitments. TXO commitments. TXO bitfields. Rolling UTXO set hashes. Client-side validation. Peer encryption & auth. Fraud proofs. Scriptless atomic swaps. Zerolink/tumblebit. [Cut:] layer 2, HF rsrch, bip 8. (@rusty_twit)
and a paaartridge in a pear tree