Distributed Crypto Key Sharing for Offline Quorum Transactions
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Solution Overview
Problem
Cryptocurrencies face challenges such as vulnerability to loss or theft of cryptographic keys, complexity in 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 transactions, allowing for secure management and offline transactions without internet connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If third-party custody is used, then ease of operation is improved, but reliability deteriorates due to security concerns and loss of access during bankruptcy or unanticipated events
Solution Approach 1:
The private key is divided into multiple key shares that are distributed across different devices (e.g., mobile device, computer, hardware wallet). No single entity controls the entire key, eliminating reliance on a single third-party custodian while maintaining ease of use through distributed access.
Solution Approach 2:
A multi-signature scheme acts as an intermediary mechanism that requires coordination between multiple devices and users to access funds. This mediator approach provides both ease of operation through automated verification and reliability through distributed control, preventing single-point failures.
2Reliability
If self-custody is used, then reliability is improved, but ease of operation deteriorates due to technical complexities in managing cryptographic keys
Solution Approach 1:
The complex private key management is segmented into multiple manageable key shares stored on different devices. Each device holds only a portion of the key, simplifying individual device security while maintaining overall control through the distributed key share structure.
Solution Approach 2:
The system changes the parameter of key storage from a single complex key to multiple simplified key shares. This parameter transformation reduces the technical complexity on each individual device while maintaining the security and control benefits of self-custody.
3Ease of operation
If internet connectivity is required for transactions, then ease of operation is improved through third-party processing, but reliability deteriorates when internet service is unreliable or unavailable
Solution Approach 1:
The system enables self-service transactions between devices without requiring internet connectivity or third-party processing. Users can directly transfer cryptocurrency between their devices using the distributed key shares, making the system autonomous and independent of external networks.
Solution Approach 2:
The dependency on internet connectivity and third-party processors is extracted from the transaction system. The multi-signature protocol allows direct peer-to-peer transactions that function offline, removing the harmful external dependency while maintaining ease of operation.
4Ease of operation
If a single private key is used, then ease of operation is improved, but reliability deteriorates due to vulnerability to loss or theft
Solution Approach 1:
The single private key is segmented into multiple key shares distributed across different devices and potentially different locations. This segmentation maintains ease of operation through simplified access requirements while dramatically improving reliability by eliminating single-point failures from loss or theft.
Solution Approach 2:
The system provides beforehand cushioning by distributing key shares in advance across multiple devices before any transaction occurs. This pre-distributed redundancy ensures that if one device is lost or compromised, the remaining key shares continue to provide secure access to the cryptocurrency.
Data Source
AI summary
A system for managing and using digital financial assets, such as cryptocurrency uses multiple independent devices that mutually cooperate to control cryptocurrency assets in a secure manner. Each of these devices may store a unique private key associated with the cryptocurrency assets, which may be configured such that a certain minimum number of these private keys are required to transfer the cryptocurrency assets. The use of multiple private keys spread across multiple distinct devices may reduce the likelihood of loss stemming from a hardware failure or reduce the likelihood of an attacker successfully gaining access to the cryptocurrency assets. In addition, selection of the devices to be used for storing these private keys, as well as how many private keys are required to authorize a transaction, may be tailored to balance a user's preferences for reliability of access versus security and for third-party custody versus self-custody.