The ECB is inviting potential candidates for participation in the debate to address four technical issues:Large-scale application of privacy-preserving technologies in retail payments in combination with the traceability of financial transactions. How do such technologies interact with those for user authentication for payment solutions?Security of offline payment solutions that are not linked to any external system for conducting consecutive payments.
How can we make the top-up process and the use of the secure element more convenient?Top-up, funding and defunding of digital wallets or accounts for bearer and account-based payment solutions. How can we make it easier for customers to fund and defund a payment wallet or account, either
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