Authenticating a transaction

An authentication system for authenticating a transaction, wherein the transaction is performed at a transaction system, wherein the authentication system comprises:

• a communication interface configured for communication with a transaction verification device;
• a processor subsystem configured to:
• obtain, from the transaction verification device, one or more camera images of a visual presentation of the transaction, wherein the visual presentation comprises uncoded data and machine-extractable coded data;
• based on the coded data, obtain verification data from the transaction system for verifying one or more authenticity features of at least part of the uncoded data;
• verify the one or more authenticity features based on the verification data;
• provide a verification result based on the verifying.

A transaction system for performing a transaction, wherein the transaction system comprises:

• a data interface for accessing data representing the transaction;
• a processor subsystem configured to:
• provide a visual presentation of the transaction, wherein the visual presentation comprises uncoded data and machine-extractable coded data;
• provide verification data for verifying one or more authenticity features of at least part of the uncoded data.

A transaction verification system for authenticating a transaction, wherein the transaction is performed at a transaction system,

• wherein the transaction system is configured to provide a visual presentation of the transaction, wherein the visual presentation comprises uncoded data and machine-extractable coded data;
• and to provide verification data for verifying one or more authenticity features of at least part of the uncoded data;
• wherein the transaction system comprises a transaction verification device configured to obtain, using an image interface, one or more camera images of the visual presentation of the transaction;
• and
• wherein the transaction verification device, the transaction system, or an authentication system to which the transaction verification device is configured to provide the one or more camera images, is configured to:
• based on the coded data, obtain the verification data from the transaction system;
• verify the one or more authenticity features based on the verification data;
• and
• provide a verification result based on the verifying.

A computer-implemented method of authenticating a transaction, wherein the transaction is performed at a transaction system, wherein the method comprises:

• obtaining, from a transaction verification device, one or more camera images of a visual presentation of the transaction, wherein the visual presentation comprises uncoded data and machine-extractable coded data;
• based on the coded data, obtaining verification data from the transaction system for verifying one or more authenticity features of at least part of the uncoded data;
• verifying the one or more authenticity features based on the verification data;
• providing a verification result based on the verifying.