Cryptoasset Custodial System With Dynamic Air-Gap Staking
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Solution Overview
Problem
Existing custodial systems for cryptocurrencies lack secure and efficient mechanisms to manage private keys, enabling secure storage and active participation in staking and governance protocols while ensuring access control and preventing breaches.
Innovation Solution
A computer-implemented cryptoasset custodial system (CCS) utilizing Hardware Security Modules (HSMs) with air-gap switching, customizable staking logic, biometric authentication, and multi-user validation to securely manage private keys, enabling participation in staking and governance protocols while maintaining security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If private keys are stored securely in a custodial system with air-gap switching, then security against breaches is improved, but availability for active staking and governance protocols deteriorates
Solution Approach 1:
The air gap is made dynamic rather than static. The system switches the air gap connection state between connected and disconnected based on operational requirements. When staking or governance operations need to occur, the air gap is temporarily bridged to allow HSM access to the blockchain network, then restored for security. This dynamic switching resolves the contradiction by providing both high security (air gap maintained most of the time) and availability (temporary connection when needed).
Solution Approach 2:
The system implements periodic air gap switching at intervals (e.g., every minute or less) to maintain both security and protocol participation. This periodic reconnection allows the HSM to sign transactions and participate in staking/governance protocols at the required frequency while maintaining security posture. The periodic nature ensures the system meets blockchain protocol requirements without permanently compromising security.
2Reliability
If hardware wallets are used for cold storage, then security is improved, but accessibility for multiple users deteriorates
Solution Approach 1:
The system segments the cryptographic functions by separating key storage (in the air-gapped HSM) from user interaction (through multiple authorized user interfaces). Each user can access the system through their own device and authentication method, but all operations ultimately require the HSM's cryptographic signing. This segmentation allows multiple users to access the custodial system independently while the HSM maintains centralized secure control, resolving the contradiction between security and multi-user accessibility.
3Reliability
If air-gap switching is implemented for security, then protection against unauthorized access is improved, but system complexity increases
Solution Approach 1:
The relay server acts as an intermediary between the offline HSM and the online blockchain network. It manages the air gap switching, handles message routing, and coordinates communication timing. This intermediary absorbs much of the system complexity, allowing the HSM itself to remain relatively simple while still achieving secure air-gapped operation. The relay server handles the complex logic of when to connect, what messages to transmit, and how to maintain security protocols.
Data Source
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AI summary
Methods and systems for secure storage and retrieval of information, such as private keys, useable to control access to a blockchain, include: receiving, in a cryptoasset custodial system, a request to authorize a staking operation associated with a blockchain, wherein the staking operation is associated with a private key of an asymmetric cryptographic key pair, the private key is usable to control ownership of a cryptoasset recorded in the blockchain, and the private key is securely held in the custodial system; performing, in response to the request, a portion of the proof-of-stake protocol in a hardware security module using logic designed for the protocol, wherein the logic in the hardware security module is configured to authorize the staking operation by digitally signing an associated staking transaction; and sending the digitally signed staking transaction to another computer to effect the staking operation on behalf of the user.