I have two YubiHSM 2 modules in my Kubernetes cluster for certificate signing. They support secp256k1, so I built a terminal wallet on top. BIP-39 from hardware entropy, BIP-32 HD derivation, and HSM-signed transactions. Supports Tor routing and local Bitcoin Core for privacy.
Write-up with security model and signing pipeline: https://charles.dev/blog/yubihsm-bitcoin-wallet
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