Bitcoin and privacy.

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

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.
What is Citrea? The Bitcoin rollup powered by BitVM?

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.
What is Rootstock? The Bitcoin sidechain for smart contracts

What is Rootstock? The Bitcoin sidechain for smart contracts

Bitcoin was designed as a monetary system, not as a programmable platform. Yet over the past few years, several solutions have attempted to extend its capabilities without modifying its core protocol. Rootstock fits into this trend: a sidechain aiming to bring smart contracts to the Bitcoin ecosystem.
What is the Liquid Network? Bitcoin’s private and scalable sidechain?

What is the Liquid Network? Bitcoin’s private and scalable sidechain?

Bitcoin was designed as a robust monetary system, but with intentionally limited capacity. To address these constraints, several solutions have emerged to improve its usability. Among them, the Liquid Network takes a different approach: a sidechain focused on speed, privacy, and asset issuance.
What are Ordinals, Runes, and other inscriptions on Bitcoin?

What are Ordinals, Runes, and other inscriptions on Bitcoin?

Since 2023, a new practice has emerged on Bitcoin: inscriptions. Images, text, tokens, and various files can now be recorded directly on the blockchain. Behind this shift, several protocols, Ordinals, BRC-20, and later Runes, have emerged in succession. Their appearance has expanded Bitcoin’s possible use cases while reigniting a long-standing debate about the network’s purpose.
What is BitVM? The protocol that enables Layer 2 rollups on Bitcoin

What is BitVM? The protocol that enables Layer 2 rollups on Bitcoin

Since its inception, Bitcoin has been designed as a simple, robust monetary system with intentionally limited programmability. Unlike blockchains such as Ethereum, it does not natively support complex smart contracts. Yet, the demand for more advanced applications on Bitcoin continues to grow, pushing developers to explore new approaches. This is where BitVM comes in.
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