Cryptocurrency Key-Share Management for Secure Offline Transactions
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Solution Overview
Problem
Cryptocurrencies face challenges such as vulnerability to loss due to hardware failure or malicious access, complexity in self-custody management, and reliance on internet connectivity for transactions, which hinder adoption and security.
Innovation Solution
A cryptocurrency management system that distributes cryptographic key shares across multiple devices, requiring a quorum for transaction authorization, allowing offline transactions and enhancing security through direct device communication and authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If third-party custody is used, then ease of operation is improved, but security and access reliability deteriorate
Solution Approach 1:
The private key is segmented into multiple key shares distributed across different devices (mobile device, cryptocurrency management device, server). No single entity controls the entire key, eliminating the need for third-party custody while maintaining security through distributed control.
Solution Approach 2:
A cryptocurrency management device acts as an intermediary between the user's mobile device and the blockchain network. This intermediary manages the complex cryptographic operations and key share coordination, simplifying user operation while maintaining security through multiple authentication points.
2Reliability
If self-custody is used, then security is improved, but device complexity increases
Solution Approach 1:
The complex private key management is segmented into multiple key shares stored on different devices. This distributes the complexity across multiple devices rather than concentrating it in one location, making the system more secure while reducing the complexity burden on any single device.
Solution Approach 2:
The cryptocurrency management device serves as an intermediary that handles the complex cryptographic operations, including generating key shares, managing authentication protocols, and coordinating transactions. This shields the user from technical complexities while maintaining strong security through self-custody.
3Adaptability or versatility
If internet connection is required for transactions, then adaptability is improved, but reliability deteriorates
Solution Approach 1:
Cryptographic key shares and authentication credentials are prepared and stored in advance on multiple devices before transactions are needed. This preliminary preparation enables transactions to proceed offline without requiring real-time internet connectivity, improving reliability while maintaining adaptability through local transaction capability.
Solution Approach 2:
Multiple copies of key shares are distributed across different devices (mobile device, cryptocurrency management device, server). These copies enable the system to function independently of a single internet connection, as transactions can be authenticated and executed using the distributed key shares stored locally on each device.
4Reliability
If multiple key shares are distributed, then security is improved, but loss risk increases
Solution Approach 1:
The private key is segmented into multiple key shares distributed across different devices and potentially different locations. This segmentation ensures that loss of any single device or key share does not result in complete loss of access, as the threshold number of shares can be recovered from remaining devices.
Solution Approach 2:
Multiple redundant key shares are stored in advance across different devices before any loss event occurs. This beforehand cushioning ensures that if one or more devices are lost or damaged, the remaining key shares provide sufficient recovery capability to maintain access to cryptocurrency funds.
Data Source
AI summary
A system for locally authenticating a transaction of digital financial assets, such as cryptocurrency. A first device may locally store financial assets in non- volatile memory of the first device. The first device may use the locally-stored financial assets to conduct a local transaction with a second device. The first device may generate a transaction settlement data token and exchange the token with the second device, wherein the transaction settlement data token includes information specific to the local transaction, a value associated with the local transaction, and encrypted personal information associated with the first device. After receiving a confirmation of transmission from the second device, the value associated with the local transaction may be debited from the locally-stored financial assets.