Channel Jamming Lightning's HTLC-based forwarding has DoS vulnerabilities where malicious senders block honest payments without paying for the disruption. Two main variants Slow-jam (resource jamming) Attacker sends large HTLCs that fail to settle until close to CLTV expiry, then fails them. During the wait, the channels' HTLC slots + liquidity are tied up. Cost to attacker: nothing — failed HTLCs cost zero (no fee paid for failed payments). Damage: legitimate payments rejected for "no liquidity" / "no slot available" while attacker's HTLCs sit. Fast-jam (channel exhaustion) Attacker rapidly…