Cryptographically Signed Messages for Offline Multi-Hop Currency Transfers
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Solution Overview
Problem
Existing blockchain systems require online connectivity for cryptocurrency transactions, making offline transfers impossible, which compromises security, immutability, and privacy.
Innovation Solution
A method and system for offline cryptocurrency transfers using cryptographically signed transfer messages, secure connections, and secure data storage to enable transfers while maintaining participant privacy, involving a chain of custody for transfer messages and secure data storage on computing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional blockchain transaction processing is used, then transaction security and immutability are maintained, but offline transfers are impossible requiring active connection to blockchain node
Solution Approach 1:
The system performs preliminary actions by generating and signing transfer messages offline before actual transaction execution. The transfer message is cryptographically signed in advance using the sender's private key, allowing the transaction to be prepared and validated offline, then submitted to the blockchain when connectivity is available.
Solution Approach 2:
The transaction process is segmented into distinct phases: offline message generation and signing, online submission and verification. This separation allows the cryptographic operations to occur offline while only the final submission requires network connectivity, resolving the contradiction between offline capability and security verification.
2Ease of operation
If transfer messages are made accessible for offline transfers, then offline transaction capability is enabled, but participant privacy may be compromised
Solution Approach 1:
The system extracts only the essential transaction data needed for offline transfer (cryptographically signed transfer message) while leaving sensitive participant information on the blockchain. The offline transfer message contains sufficient information for validation but does not expose private keys or sensitive personal data.
Solution Approach 2:
The transfer message acts as an intermediary that carries transaction information offline without exposing sensitive data. It serves as a secure carrier that can be transmitted offline while maintaining the integrity and privacy of the underlying blockchain transaction.
3Adaptability or versatility
If multiple parties perform offline transfers, then transfer flexibility is improved, but tracking and verification of the transfer chain becomes complex
Solution Approach 1:
The system implements feedback through cryptographic verification where each recipient validates the transfer message using the sender's public key before accepting or forwarding it. This verification feedback ensures the integrity of each hop in the transfer chain without requiring complex tracking infrastructure.
Solution Approach 2:
The transfer message is copied and forwarded through multiple parties offline, with each party creating a verified copy rather than modifying the original. This copying mechanism allows multi-hop transfers while maintaining a simple verification process based on cryptographic signatures rather than complex chain tracking.
Data Source
AI summary
A method for processing offline cryptocurrency transfers includes: receiving, by a receiver of a computing device, a first transfer message, wherein the first transfer message is cryptographically signed using a first private key of a first key pair; validating, by a processor of the computing device, the cryptographic signature of the first transfer message using a first public key of the first key pair; storing, in a memory of the computing device, the validated first transfer message; receiving, by an input device of the computing device, a transfer instruction, the transfer instruction including at least a communication address; and electronically transmitting, by a transmitter of the computing device, the validated first transfer message to an external device based on at least the communication address.