Self-Custodial Cloud

Safer, Simpler, Sovereign

To collaborate, to manage their identities and to access their own data, users pay increasingly high rent to someone else. All the while keeping getting hacked, ransomed or spied upon...

What if there was a solution, right in our own hands ?

4NK builds a user‑owned cloud bringing sovereignty and simplicity together. Digital sovereignty has been third party promise for way too long. 4NK's self-custodial cloud makes it a technical reality

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Rebuild the Web, Upright

The 4NK Self-Custodial Cloud OS runs as app on your often-idle equipement.

We are restoring user agency on the internet by leveraging private keys as the core building block to anchor ownership and trusted workflows. No blockchain, and no token : simply a client-side infrastructure that extends Bitcoin’s properties for everyday use and collaborative workflows.

Our approach is pragmatic, privacy‑first, and Bitcoin‑aligned.

Identity

Users own and manage their keys. The infrastructure is built around you. Control what you share, with whom and how.

Infrastructure-less

Leverage existing or underused gear (laptop, servers..) to run the Self-Custodial OS app. New CAPEX is optional. Invite others to use your infrastructure on your own terms, they don't need a node but only a browser.

Security

Your data, your rules. Encrypted by default, shared on your terms. Fully encrypted storage. Local or distributed. All communications are encryped and do no leak meta-data by leveraging Bitcoin's silent-payment functionality.

Network

Collaborate and Network as you wish. Network layer is made up of nodes which can be local or distributed. Many networks can be built from nodes in the open or as dedicated islands.

Your Keys,
Your workflows

The Self-Custodial Cloud value proposition is for you to build any cloud collaborative workflow you want.
Here are some examples of the services you can deploy.

Personal Digital Safe

Secure storage for yours documents. Secure sharing. Choose whether it is store locally or on the cloud. It's always fully encrypted by your private key.

Personal Sovereignty

Run an LLM only on content you own and want to keep private. 100% local .
Without any data leak

Collaborative documents

Build secure document workflows. With encrypted data storage and sharing. Super simple identities management : create, share, invite any users (they do not need to run a node, just a browser).

Workflows orchestration

Your Rules: fully manage rules, roles, access policies, and data access for any workflow. Always with verifiable identities. Audit trail with timestamped proofs at each and every interaction..

Updates

Recent highlights and projects from the 4NK network.

Sep 2025: Alpha release for a B2C Self-custodial cloud freemium service.
Aug 2025: Alpha release for a self hosted local LLM running only on the user's content.
Jul 2025: Pre-production stage for the secure document workflow for notarial services.
March 2025: First POC for a fully secure document workflow for notarial services.
2024 - 2025: Bitcoin meetups "Tour de France" showcasing the properties of Silent Payments

Team

Our team and advisory board consists of experienced professionnal and talented Bitcoiners, including core developer. Our mission is to expand Bitcoin's properties, such as self-custody, privacy and empowerement, to the everyday digital life.