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Bitcoin Advocates Campaign for Signal to Adopt BTC via Cashu Protocol

Executive Summary A prominent campaign, backed by figures such as Jack Dorsey and Peter Todd, is advocating for the integration of Bitcoin payments into the privacy-focused messaging application Signal through the Cashu protocol. This initiative seeks to provide a decentralized and private alternative to Signal's current MobileCoin (MOB) payment solution, which has faced criticism for its centralized nature and limited validator set. The campaign highlights Cashu's Chaumian Ecash solution as a method to enable private Bitcoin transactions, addressing concerns about Bitcoin's public ledger within a privacy-centric environment. The outcome of this push could significantly influence how peer-to-peer payments are integrated into mainstream applications, potentially affecting Signal's estimated 70 million monthly active users and setting a precedent for the broader Web3 ecosystem. The Event in Detail Jack Dorsey, a prominent cryptocurrency entrepreneur, and Peter Todd, a respected Bitcoin developer, are leading public calls for Signal to adopt Bitcoin for peer-to-peer payments. This campaign centers on the proposed integration of the Cashu protocol, which utilizes a Chaumian Ecash solution, into Signal. Dorsey has publicly supported the initiative, including by retweeting posts from Cashu, a pseudonymous developer leading the campaign. Todd has been a vocal critic of Signal's existing payment system, MobileCoin, citing its perceived centralized nature and limited accessibility. Other notable supporters include pseudonymous Bitcoin developer Calle and Satoshi Labs co-founder Pavol Rusnak. Signal introduced MobileCoin for in-app payments in April 2021 and continues to support it as its sole cryptocurrency option. However, advocates for Bitcoin integration argue that MobileCoin's small validator set introduces centralization risks that are antithetical to Signal's privacy mission. The "Bitcoin for Signal" campaign aims to demonstrate how Bitcoin, enhanced with Cashu's privacy features, can align with Signal's core principles, offering a robust alternative for private financial transactions within the messaging platform. Financial Mechanics and Protocol Analysis At the core of the "Bitcoin for Signal" campaign is the distinction between Bitcoin's native privacy characteristics and the enhanced privacy offered by Chaumian Ecash via the Cashu protocol. Bitcoin transactions are pseudonymous; they are recorded on a global, time-stamped public ledger, making them traceable. Each transaction reveals the source of funds, output addresses, exact amounts, fees, and timing, allowing chain surveillance firms to deanonymize users through statistical heuristics and address clustering. In contrast, Cashu's Chaumian Ecash operates entirely off-chain, leaving no public trace. It eliminates concepts like UTXOs and historical footprints. This system relies on cryptographic trust in a "mint" that issues and redeems tokens using blind signatures. This cryptographic primitive allows the mint to sign a message (token) without knowing its content, ensuring that tokens are unlinkable across time and providing strong transaction privacy. Cashu itself is a lightweight, stateless, and denomination-based protocol that integrates with the Lightning Network, offering fast, modular, and privacy-preserving user experiences. Unlike public-ledger systems, Cashu mints do not maintain databases of users, balances, or transaction logs; all state is maintained client-side using cryptographic tokens, significantly reducing attack surfaces and simplifying deployment. Signal's current payment solution, MobileCoin, is a privacy-focused ERC-20 token. However, its design, particularly its small validator set, has led to criticisms from Bitcoin proponents regarding centralization, contrasting sharply with Bitcoin's decentralized architecture and Cashu's approach to off-chain privacy. Business Strategy and Market Positioning Signal, with its approximately 70 million monthly active users, currently maintains MobileCoin as its exclusive in-app payment method despite past scrutiny. The "Bitcoin for Signal" campaign represents a strategic push to re-evaluate this positioning, urging the platform to embrace Bitcoin as a more aligned option for secure and private peer-to-peer transactions. The advocates believe that by integrating Bitcoin via Cashu, Signal could enhance its value proposition as a trusted communication and transaction platform. Should Signal adopt Bitcoin through Cashu, it would not only validate Bitcoin's utility beyond a mere store of value but also transform the application into a significant platform for micro-payments. This move would position Signal distinctly in the market, leveraging the widespread recognition of Bitcoin while addressing privacy concerns inherent in its public ledger. This strategy differs from corporate treasury allocations to Bitcoin, like MicroStrategy, focusing instead on user-level transactional utility and integrating digital currency into everyday communication, potentially setting a new standard for how messaging apps approach financial services. Broader Market Implications Successful integration of Bitcoin and Cashu into Signal could have multi-faceted implications across the Web3 ecosystem and broader digital economy. For the Web3 space, it would serve as a powerful real-world case study for the adoption of privacy-enhancing layers on top of established cryptocurrencies, potentially inspiring similar integrations in other mainstream applications. This could accelerate the development and adoption of privacy-focused payment protocols and bolster confidence in the utility of decentralized finance for everyday transactions. From a corporate adoption standpoint, Signal's move could encourage other technology companies, particularly those focused on communication and privacy, to explore Bitcoin integration, shifting corporate sentiment towards using Bitcoin as a transactional currency rather than solely an asset. This could drive innovation in payment solutions that balance privacy with accessibility. Investor sentiment towards Bitcoin's utility could also see a positive shift. Proving Bitcoin's viability for private, peer-to-peer micro-payments within a widely used application would reinforce its fundamental value proposition and potential for mainstream adoption. Furthermore, this initiative is particularly relevant in the context of increasing regulatory scrutiny on digital communications. The ongoing discussions around the EU's "Chat Control" law, which proposes client-side scanning of messages, highlights the critical need for privacy-preserving technologies. A robust, private payment solution within Signal, such as Cashu-enabled Bitcoin, could become a crucial tool for users safeguarding their financial privacy against potential surveillance. Signal has previously indicated a willingness to exit the EU market rather than compromise on encryption, underscoring the high stakes involved in maintaining user privacy across its services, including financial transactions. Expert Commentary Jack Dorsey has explicitly stated his view that "Signal should use Bitcoin for P2P payments," advocating for Bitcoin as a functional payment system beyond its role as digital gold. Peter Todd has been critical of Signal's existing MobileCoin solution, calling it "centralized" and advocating for Bitcoin as a more viable alternative due to its decentralized nature. Conversely, some experts raise concerns regarding Bitcoin's inherent transparency. José Pedro Sousa, an engineer at Aztec Network, has questioned the use of a public blockchain for a privacy-centric application like Signal. Similarly, Techlore, a digital rights advocacy group, has warned that Bitcoin integration, without proper privacy layers, could jeopardize user privacy within Signal. The campaign addresses these concerns by emphasizing that Cashu's Chaumian Ecash specifically provides the necessary privacy features to make Bitcoin suitable for Signal's user base, effectively bridging the gap between Bitcoin's robust security and Signal's commitment to user privacy.