Martin Zumsande joins us to tell us about the address spam in the summer of 2021 and his interests in AddrRelay and Bitcoin Core development. We discuss with Martin: - His background (1:38) - Getting interested in Bitcoin (2:45) - How to approach P2P (3:55) - The network is changing (7:30) - What's the purpose of the Address Manager (AddrMan)? (9:33)Peering differences to LN nodes (11:00)   - Ethan Heilman's talk on Network Partitioning Attacks (12:10)   - Addrman and eclipse attacks (12:27) - AddrRelay and the role of node addresses (12:55)Getting connected to the network (13:37) - Self-announcements (14:25) - Address spam in summer 2021 and peer distribution (15:05) - Correction: The peer would not get addresses-divided-by-peers addresses, but 2×addresses-divided-by-peers addresses as the addresses get forwarded to two peers each. (18:00) - Estimating the Node Degree of Public Peers and Detecting Sybil Peers Based on Address Messages in the Bitcoin P2P Network by Matthias Grundmann (19:30) - Simulating the network (20:15) - Requesting addresses from peers (21:45) - Walking through first connection of a node (25:25)Coinscope paper (27:10) - Being a Bitcoin Core contributor (27:50) Thanks to Emily Kee for the sound engineering.