M-Key Safe Vault is a new generation of cryptocurrency/virtual asset vault. As an advanced safety measure against quantum attack, M-Key Safe Vault prevents private key from being stolen by high-risk hacking activities. M-Key Safe Vault can set multi-level threshold management according to the actual scene of the company, set each approver at each level, and adopt the mode of M taking N to agree to sign and approve. Once the transaction application is put forward, the time and level of both applicants and approvers are recorded in detail, and the signing and approving progress can be tracked in real time, which realizes a high-security treasury management mechanism.