Multi-chain transaction signing CLI tool for 12 chains: Ethereum, Bitcoin, Solana, Cosmos, Tron, Sui, TON, Filecoin, Spark, XRP Ledger, Aptos, and Nostr. Use when the user asks to sign messages, sign hashes, sign transactions, sign Nostr events, or look up addresses / public keys / NIP-19 npub / nsec from private keys. Supports JSON output via --json flag for programmatic/agent consumption.
2026-04-24