Dusk Network launches Citadel:

Zero-Knowledge KYC solution

Research submitted and first use cases in development

AMSTERDAM, 25 JANUARY 2023 - Fintech scale-up Dusk Network presents Citadel, a zero-knowledge proof KYC solution where users and institutions are in control of sharing permissions and personal information. The framework can be used for all claim-based KYC requests and puts users in total control of what information they are sharing and with whom while being completely compliant and private at the same time. 

After months of research and submitting the official paper to arXiv, Citadel finally launches. It is one of the first decentralized Know Your Customer (KYC) solutions focusing on the financial ecosystem, that invites institutions to use the technology for cost-reducing compliance. As the user is in charge of his own data, it isn’t necessary to do KYC with service providers that have already been used prior. Or for example, multiple KYC processes for the trade of one asset. 

How does Citadel work

Dusk Network is the first to integrate zero-knowledge technology KYC in a Layer-1 (L1) blockchain. It is a key feature of Dusk Network itself to implement it in its privacy-preserving protocol. Using the Citadel framework, an entity that is able to handle private information - for example, the company Dusk who is compliant with all necessary regulations and is allowed to handle private information, or a company that is verified to do KYC on behalf of institutions - can provide a list of requirements for their KYC verification. The user who needs to provide the KYC verification is able to provide the necessary information, share how long their information can be stored and can withdraw access to their data. The company will authenticate the data, which will be privately stored in the Dusk blockchain. To simplify: it is using non-fungible token (NFT) technology, where instead of an art piece, a license is created.  

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Use case

If you open a bank account, you need to go through a KYC verification procedure and share personal information with your bank. If you then decide to do stock trading, you'll need to open an account with a brokerage service, where you will also have to do KYC/Anti-Money Laundering (AML). You will either have to share the same information with them, or your bank will provide it to them. If you buy a house and get a mortgage, you will also have to offer a lot of KYC/AML/personal information. All these players will keep your information and store it, which both has a big impact on your privacy and puts you at risk of data leakage.

Instead, if you use Citadel, you would store your data with one party who is only able to store and verify data, and other services can opt to accept the licenses and use that as KYC/AML proof. This significantly reduces risk and privacy exposure. In a fully on-chain world, you can buy regulated assets simply by providing a license that you're in compliance with the requirements of the trading platform. You can borrow money from a lending service by providing a license that meets their KYC and AML requirements. You can loan out money and get yield, simply by providing the license. No need to share personal information with the three parties. For safety measures, a quarterly confirmation of the correctness of all the provided data in the license, could help data stay up to date.

Cost-reducing compliance

Banks and financial institutions are often complaining that new regulations like the Travel Rule* and other Anti-Money Laundering measures are costly operations, costs that are also charged to the customer. The processes to meet the requirements are tedious, time-consuming and involve many unnecessary parties, making the process even more challenging. Citadel as a SSI protocol can provide the basis for a KYC service that could eliminate the need for financial institutions to do KYC/AML themselves and/or with third parties. It can significantly reduce the cost for gathering, protecting and renewing client information. A KYC provider built on Citadel will speed up processes and information is always up to date, real-time accessible and privacy-preserving. With Citadel, the client will be fully in charge of their own details, without unnecessary information duplication and a reduced risk of information leakage. 

Next to digital identity verification like in the use case above, Citadel can be used for privacy-preserving transactions and global compliance and much more.


Note for editors, not for publication


*Definition Travel Rule

Dusk Github repositories

Research ArXiv 

Link to forerunner FORT 

Download media kit with infographic and demo

About Citadel

Citadel is a self-sovereign identity (SSI) protocol that runs integrated into Dusk Network. It can be seen as a framework for SSI solutions, as anyone can use it for their own use case. We call SSI to those systems allowing users to manage their identities, their personal information, in a fully transparent manner: knowing at each time which information about them they are sharing, being able to consent or deny each request for personal information.

A detailed explanation and more use cases can be found in the media kit

About Dusk Network 

Dusk Network is the global financial network for institutions and individuals that combines the privacy of FinTech, the instant clearance and settlement of DLTs, and the composability of DeFi. Dusk unlocks economic opportunities for all by making institutional-level financial assets directly available to users and investors.

Dusk Network is currently in test net mode, onboarding node runners to trial and error the Dusk blockchain. The incentivized testnet is one of the most decentralized ones in the industry, with over 650 node runners participating in the first phase of the incentivized test network. Dusk Network was founded in 2018 and is headquartered in Amsterdam.

About Dusk Research

Dusk Network has an entire team of 6 persons dedicated to research and development. The team researches cryptographic novelties, implementation improvements, and new use cases. Dusk is known as one of the lead implementers of PlonK, a worldwide used zero-knowledge proof system, and also as the creators of PlonKup. The latter integrates lookup tables into PlonK circuits in an efficient way, making cryptographic obfuscation of data on layer-1 blockchains affordable. 

About Dusk Network

Dusk Network is an open source blockchain for financial applications. Data protection and privacy-preservation play a major role in Dusk Network, as well as its design for regulatory compliance. The blockchain is eco-friendly, thanks to its instant settlement finality, and smart contract functionality, it is finally possible to service regulatory-compliant financial applications on blockchain technology.

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