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Marius Off-Chain

Journalist and founder of Off-Chain Media

Marius Off-Chain

Journalist and founder of Off-Chain Media

Journalist and educator passionate about Bitcoin, I strive to make this often complex subject accessible to all.

I produced a documentary filmed in El Salvador that pragmatically explores Bitcoin’s impact on the country. Each week, I host “Pair à Pair,” a show that delivers clear and precise analysis of Bitcoin news and protocol developments.

I founded Off-Chain Media to contribute to the democratization of Bitcoin and its tools.

Signed · 26 articles
Sovereignty8 min read

bitchat tutorial: how to keep communicating when the internet or social media is censored

bitchat passes messages from phone to phone over Bluetooth, with no internet, no account and no phone number. Installing it, the public chat, encrypted private messages, verifying contacts, the emergency wipe and the app's limits: the full tutorial, on video and step by step.

Bitcoin6 min read

Bull Bitcoin drags DAC8 before the Conseil d’État to have it canceled and draws a line in the sand

Bull Bitcoin announces that it has brought the French decree transposing DAC8 before the Conseil d’État, even though the company has just obtained its MiCA authorization. Behind this apparent paradox, Théo Mogenet, Managing Director of Bull Bitcoin Europe, defends a simple line. A Bitcoin platform can accept entering the European framework, without accepting that compliance becomes the systematic collection of sensitive data.

Bitcoin8 min read

El Salvador, Bitcoin and Bukele: Audit of a Political Laboratory

In 2021, El Salvador became the first country to adopt Bitcoin as legal tender. Five years on, the balance sheet is contradictory: real security gains, an IMF deal that walked back the experiment, and a sovereignty narrative far simpler than the reality.

Layer 220 min read

What is Spark? The Bitcoin Layer 2 behind the new wave of self-custodial wallets

Spark is a Bitcoin Layer 2 based on statechains and shared signing. It gives wallets a way to offer a Lightning-like payment experience without taking direct custody, but its self-custody guarantees are weaker than holding bitcoin directly on L1.

Layer 215 min read

What is the Ark protocol? The missing piece to make Bitcoin a scalable everyday currency

Bitcoin is often described as a store of value, a form of “digital gold” meant to be held rather than spent. Yet, to function as a true monetary system, it must also enable payments that are fast, simple, and accessible. While solutions like the Lightning Network have significantly improved this aspect, they still introduce a level of complexity that limits adoption. It is in this context that the Ark protocol emerges.

Lightning20 min read

What Is the Lightning Network? Bitcoin's Payment Layer Explained

The Lightning Network is Bitcoin's payment layer, enabling instant, low-cost transactions without compromising decentralization. Discover why it exists, how it solves Bitcoin's scaling limits, and whether it is a viable long-term solution or just an intermediate step in Bitcoin's evolving monetary infrastructure.

Bitcoin21 min read

What Is Bitcoin? The Digital Currency Challenging Gold and Central Banks

Bitcoin is often treated as a speculative asset, but its purpose is more structural: to offer a scarce, verifiable digital currency without a central issuer. Here's how it works, what problem it solves, and why it matters beyond ETFs and exchanges.

Layer 25 min read

What is Citrea? The Bitcoin rollup powered by BitVM?

While Bitcoin still concentrates most of the liquidity in the crypto market, its use remains largely limited to value transfer and long-term holding. This contrasts with other ecosystems where on-chain financial applications have expanded significantly. It is within this context that Citrea emerges, aiming to make Bitcoin programmable without modifying its base protocol.

Lightning5 min read

What Is E-Cash? David Chaum’s Confidential Transaction Protocol on Bitcoin

E-Cash is making a comeback in the Bitcoin ecosystem through protocols like Cashu and Fedimint. At its core lies an older idea: enabling digital payments that are as private as physical cash, without exposing every transaction to a public ledger or a centralized intermediary.