Even more robust security technology is being developed in combination with hardware wallets.
MPC (multi-party computation) is the next generation of private key security. MPC is a cryptographic technique that allows multiple parties to solve problems that require input of all secrets in a distributed manner, without sharing the secrets with each other. Fireblocks developed the MPC-CMP protocol, which applies this concept to blockchain-based ECDSA and EdDSA signatures (used by all blockchains). MPCCMP eliminates the notion of a single private key. Such a key is never collected in its entirety, neither during the initial creation of the wallet nor during the actual signing. MPC-CMP takes a series of steps to ensure that the private key is never compromised.