The Censorship-Resistant Cashu Protocol Powering Cuba’s Secret Financial Revolution

• Cuba’s economic collapse and 20-hour blackouts make Bitcoin a essential tool for daily financial survival.

• A community-built “sovereign bank” uses Cashu and Lightning for offline, censorship-resistant transactions without third parties.

A segment of the population has begun using Bitcoin as a mechanism for financial preservation and for conducting transactions.

The Cuba Bitcoin community, started in 2022, formed as a direct response to these difficulties. Its development began in a practical manner, with the operation of their own Lightning Network node. This initial step allowed them to receive donations without the risk of being blocked by third parties.

Subsequently, they integrated educational programs like “Mi Primer Bitcoin” to train their members, evolving into their own course, Bitcoin Fácil, aiming to democratize knowledge about this technology.

Developing Autonomous Financial Infrastructure

Under the direction of one of its founders, the community built a system they call a “sovereign bank.” This ecosystem, named “Cashu for Community” is composed of several technical tools designed to operate under conditions of limited connectivity and under the threat of censorship. It includes a Lightning Network node that uses Neutrino, a light client that does not require downloading the entire Bitcoin transaction history, optimizing its operation on mobile devices.

A central piece of this system is the Cashu “mint” a protocol that enables offline transactions through the use of blind signatures, a method intended to preserve users’ financial privacy. Another key tool is “La Chispa” an intuitive interface that simplifies payments via the Lightning Network, making the user experience comparable to a simple, everyday action.

Many developers outside Cuba refused to collaborate for fear of potential legal repercussions, given that Bitcoin use on the island operates within a complex legal framework. This led the group to integrate and adapt solutions like the LNBits wallet and BTCPay Server for online stores, building an infrastructure resistant to frequent blackouts.

Regional Projection and Custody Model

The model developed in Cuba now seeks replication in other regions with similar challenges, specifically in Latin America and Africa. The proposal focuses on creating circular Bitcoin economies where communities have direct control over the tools and custody of their funds. This approach differs from the corporate model, where a centralized entity manages user assets without necessarily offering full transparency over their handling.

The Federation of Bitcoin Communities of Latin America has recognized this initiative. Cuba Bitcoin is one of the 39 communities that joined this organization in 2024.