Wallet

Auth Setup

# API key (persistent — recommended)
nansen login
# Or non-interactive:
NANSEN_API_KEY=<key> nansen login

# Verify
nansen research profiler labels --address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 --chain ethereum

Password Policy (Agents)

CRITICAL: Never hold a wallet password only in memory.

Wallets are encrypted with AES-256-GCM. A lost password means permanently locked funds — there is no recovery mechanism. Passwords must be persisted to ~/.nansen/.env so they survive session restarts.