The friction that killed Bitcoin as a daily payment tool - switching between a wallet and a chat app - is gone. Seth For Privacy launched Radar, a fork of the Signal client with a Lightning wallet baked in. Seth has used it as his primary Signal client for months.
“Most payments happen between people who are already talking.”
- Seth For Privacy, Ungovernable Misfits
The technical backbone is Spark via the Breeze SDK, letting users send sats without managing channels. Unlike previous attempts that required custodial models, Radar stays noncustodial. The design is intentionally limited: not a power-user wallet, but a way to make sending money feel as native as sending a text.
Signal’s phone number requirement and existing user base solve the ‘cold start’ problem. A Radar user can message anyone on the standard Signal app immediately; payments only work if both parties use the fork. Seth argues the number requirement, controversial among privacy purists, is a necessary evil to keep the network spam-free and approachable. He suggests using a service like Cloaked Wireless for a private verification number.
Sovereignty versus usability gets a trade-off. Instead of the ‘scary’ 12-word seed phrase, Radar offers encrypted cloud backups of private keys within the Signal account. Seth acknowledges that if a Signal account is compromised, funds are at risk, but for a mobile hot wallet, the convenience of instant recovery outweighs that risk for entry-level users.
On TFTC, Vik Sharma cited the convenience of WeChat payments and a tweet from Jack Dorsey as key drivers for building Radar. Future features include group chat payments like bill splitting and stablecoin integration that allows automatic conversion on Spark.
“If the user doesn't have to think about the plumbing, they'll use the better money by default.”
- Vik Sharma, TFTC
A week later, Ungovernable Misfits contextualized the launch against a backdrop of regulatory pushback. Francis Pouliot of Bull Bitcoin is suing the French Finance Ministry over DAC8, a directive mandating automated, suspicionless reporting of all crypto activity. Pouliot argues it violates privacy protections and oversteps. Meanwhile, when Binance restricted EU users to comply with new MiCA licensing, 70% moved their funds to selfcustody instead of joining a licensed competitor.
Regulators built a fence; the herd jumped over. Tools like Radar are the next logical step - embedding payments inside the private communication channels regulators can’t easily surveil.
