Single-Use Transaction Key Authentication for Cardless Payments

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Solution Overview

Problem

Conventional financial transactions rely on easily stolen and manipulated card numbers, involve unnecessary intermediaries, and lack active participation from entities other than the merchant and financial institution, leading to increased complexity, cost, and risk.

Innovation Solution

Implement a system that generates a single-use transaction key for financial transactions, using a non-transient computer readable storage medium to store a first portion and compare it with a second portion received from a merchant, ensuring authorization only if the portions match, thereby eliminating the need for static card numbers and involving additional entities in the authorization process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional number-based payment devices are used, then the system is simple and widely compatible, but the transaction security is poor because card numbers and verification codes are easily stolen and manipulated

Engineering Contradiction:

Improvetransaction securityVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The transaction key is divided into multiple portions (first portion stored by financial institution, second portion provided to merchant) that are distributed across different entities. This segmentation prevents any single point of failure or theft from compromising the entire transaction security, as both portions are required to complete a transaction.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system transitions from static card numbers to dynamic single-use transaction keys that are generated for each transaction. The transaction key changes with each use, making it impossible to reuse stolen credentials. This dynamic approach fundamentally improves security while maintaining system compatibility through standardized communication protocols.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple intermediaries (merchant processors, aggregators, card association systems) are involved in transaction processing, then the system achieves widespread merchant and bank compatibility, but the transaction complexity and processing time increase

Engineering Contradiction:

Improvemerchant and bank compatibilityVSAvoidtransaction processing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The transaction key system serves multiple functions: it acts as an authorization mechanism, a security credential, and a transaction identifier. This multi-functionality eliminates the need for separate verification codes, card numbers, and authentication tokens that currently require multiple intermediary systems to process, thereby simplifying the transaction flow while maintaining universal compatibility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The invention extracts the essential authorization function from the complex web of intermediaries and encapsulates it in a single transaction key verification process. By removing unnecessary intermediary validation steps and retaining only the core authorization function, the system achieves both compatibility and simplicity.

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of operation

If static card numbers are used for transactions, then the system is easy to operate and widely accepted, but the transaction risk increases because stolen card numbers can be reused

Engineering Contradiction:

Improveuser convenienceVSAvoidtransaction risk

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system replaces static card numbers with dynamic single-use transaction keys that automatically expire after one use. This dynamic credential system maintains ease of operation through automated key generation and transmission while fundamentally eliminating the risk of credential reuse, as each transaction key is valid only for its intended transaction.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The transaction key functions as a disposable security credential that is generated, used, and discarded in a single transaction cycle. This disposable nature ensures that even if a transaction key is intercepted, it cannot be reused for future transactions, eliminating the long-term security risks associated with static card numbers while maintaining operational simplicity.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS20260080405A1Systems and methods for performing financial transactions using active authentication

Publication Date: 2026.03.19 CAPITAL ONE SERVICES LLC

AI summary

A financial transaction method includes receiving a request to perform a financial transaction at a financial institution, generating a single-use transaction key for the financial transaction, and storing at least a first portion of the transaction key in a storage medium. The transaction key is transmitted to a user that requested the financial transaction, and an authorization request including at least a second portion of the transaction key is received from a merchant. The second portion of the transaction key received from the merchant is compared to the first portion of the transaction key to determine if the transaction should be authorized. An authorization message is transmitted to the merchant if the second portion of the transaction key received from the merchant matches the first portion of the transaction key. The financial transaction is funded from an account of the user if the financial transaction is authorized.