commit b6e6d3fa724c22764c17ed4f14600f1cd7d9efd5
parent 0ddde64f1d10c4b2e7fc02a14f8bc31db97219eb
Author: Henrique Chan Carvalho Machado <henriqueccmachado@tecnico.ulisboa.pt>
Date: Sat, 24 Jan 2026 20:01:17 +0100
Merge branch 'master' of git+ssh://git.taler.net/kych
Diffstat:
1 file changed, 69 insertions(+), 0 deletions(-)
diff --git a/documentation/HaRBInger.md b/documentation/HaRBInger.md
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+* Brief description of the product or solution
+
+We leverage the Swiss electronic ID (eID) to enable tokenized
+Know-Your-Customer (KYC) for our rCBDC digital cash payment solution
+for privacy-preserving and compliant peer-to-peer payments.
+
+* Innovation or novelty involved
+
+By combining self-sovereign identity systems supporting selective
+disclosure with digital cash, we enable highly efficient decentralized
+payment systems with strong Verification of Payees (VoP) to minimize
+fraud. The system exhibits the same fundamental properties and risk
+characteristics as physical cash, and its FLOSS-based architecture
+enables interoperable global deployments without raising sovereignty
+concerns.
+
+* How is it different from existing product/ solutions available in the market
+
+The proposed solution introduces peer-to-peer transactions with strong
+VoP, a capability not currently available in the financial industry.
+In most aspects, the system mirrors the functional properties of
+physical cash and physical ID, with the added conveniences of using
+digital technology. The wallets truly provide ownership and control
+over data and money; they are not based on accounts. There is no
+custodian, the citizens are directly in control over their identity
+data and money.
+
+* Technology or platform being used
+
+Our solution is based on two free and open source projects, GNU Taler
+and the SSI-inspired Swiss eID solution. It primarily uses OID4VP,
+OID4VCI, SD-JWT, OAUTH2 and blind signatures. For onboarding, Swiyu
+relies on biometric facial identification. Wallets are available for
+Android, iOS and other platforms. Where supported, hardware security
+modules can be used to add an additional layer of protection for
+sensitive data. For the (central) bank, a GNU/Linux system with a
+Postgresql database is required.
+
+* Brief process flow (if possible)
+
+1.) Citizens obtain a Swiss electronic ID online (biometric identification).
+2.) For a payment, the payer generates a virtual check containing:
+ - An expiry date
+ - Required payee attributes for verification
+3.) The virtual check is transferred to the payee via NFC, QR code, or messaging channels; this may even happen offline.
+4.) The payee redeems the check after successful identity verification through selective disclosure of the requested attributes.
+
+* Proposed benefits and potential use cases
+
+The following unique features have tremendous potential:
+
+- Scalable onboarding based on national ID at low cost with high security
+- Standards-compatible (EU, CH) with next-generation SSI-based e-ID
+- Fraud-reduction via selective disclosure of payee identity to payer
+- Micro-transactions: Taler enables transactions as small as
+ fractions of a cent.
+- Bearer instruments for identity and digital cash: the
+ e-ID and payment wallets actually hold the identity data and
+ the actual money, akin to ID documents and physical cash,
+ reducing reliance on custodians improving reliability,
+ usability, privacy and security.
+- Asymmetric anonymity was shown to improve welfare over
+ systems with two-sided anonymity or no privacy (Tinn 2024)
+- Tokenization of diverse assets: Taler goes beyond currencies
+ and enables tokenization of other fungible assets.
+
+* Any other details you may wish to highlight
+
+- No dependency on blockchain, scalable low-energy solution.
