Offline Value Transfer Reconciliation for Double-Spend Prevention

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Solution Overview

Problem

Existing electronic value transfer systems, such as physical cards and digital wallets, require online connectivity to function, limiting their usability and exposing users to risks like double spending and loss of value if offline.

Innovation Solution

A system and method for transferring value between user devices that allows transactions even when one or both devices are offline, with local storage and reconciliation upon reconnection, using biometric identification and secure encryption to prevent double spending and ensure value is stored locally.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If value is stored on a server rather than locally on user devices, then centralized control and security are improved, but offline functionality is lost and users risk losing value if devices are lost

Engineering Contradiction:

Improvevalue securityVSAvoidoffline functionality

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The system segments value storage between multiple locations: locally on user devices (enabling offline functionality) and on servers (providing centralized control). This segmentation allows the system to simultaneously achieve offline capability and centralized security management through distributed storage architecture

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system introduces an intermediary reconciliation mechanism that mediates between local offline transactions and centralized server records. When devices go offline, transactions are processed locally with cryptographic proof, and upon reconnection, the server reconciles these transactions without requiring continuous connectivity, thus bridging the gap between offline functionality and centralized control

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If continuous online connectivity is required for value transfers, then centralized verification prevents fraud, but usability is reduced and transactions cannot occur offline

Engineering Contradiction:

Improvefraud preventionVSAvoidusability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system performs preliminary actions by pre-generating cryptographic proofs and authorizations offline before connectivity is needed. Users can prepare transactions, generate digital signatures, and validate transactions locally without network connection, then sync results with the server when online, eliminating the need for continuous connectivity while maintaining security

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements a feedback mechanism where offline transactions are processed locally and then verified against server records upon reconnection. The server provides feedback by reconciling transaction states, confirming valid transactions, and detecting duplicates, thus maintaining fraud prevention through centralized verification while allowing offline operation

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If value is stored locally on user devices, then offline functionality is enabled, but risk of double spending increases without centralized verification

Engineering Contradiction:

Improveoffline functionalityVSAvoiddouble spending prevention

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system creates cryptographic copies of value representations that can be verified offline. Each transaction includes cryptographic proofs (such as digital signatures and hash proofs) that serve as verifiable copies of authorization, allowing offline validation without centralized verification while preventing duplication through cryptographic uniqueness

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The system converts the potential harm of offline storage (double spending risk) into a benefit by using cryptographic commitments and proofs. The very act of storing value locally creates opportunities for offline transactions, while cryptographic mechanisms transform the security risk into a verified transaction record that can be reconciled centrally, turning the offline capability into a security feature rather than a vulnerability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12548005B2Computer system, method, and device for transferring value with offline functionality

Publication Date: 2026.02.10 10353744 CANADA LTD

AI summary

A system and method for transferring value across user devices is provided. The system includes sending and receiving user devices. The sending and receiving user devices are configured to store value locally on the respective device. The receiving user device is configured to receive a transfer amount sent by the sending user device. The system also includes a transfer server. If the sending user device stores value at least equal to the transfer amount, the transfer server freezes an amount of value at least equal to the transfer amount. The sending user device transfers the transfer amount to the receiving user device as frozen funds to be unfrozen upon receiving confirmation from the user of the sending user device and acceptance from the receiving user device. The transfer occurs only if the sending and receiving user devices are in close physical proximity upon or shortly after the transfer request.