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Tor puts a censorship proxy on Google Play and makes bridge running a consumer install

Snowflake Volunteer ships on Google Play and F-Droid, built with Bloco and Guardian Project. The pool it feeds sat near 1,700 daily proxies, still short of a 2,100 peak.

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Photograph accompanying Tor puts a censorship proxy on Google Play and makes bridge running a consumer install
Photo: torproject.org

What happened

  • Snowflake Volunteer, a new Android app from the people behind the Tor Project, has landed on the Google Play Store as a way for the general public to help fight global censorship.
  • Snowflake Volunteer was developed in partnership among Android app studio Bloco, the Tor Network, and Guardian Project.
  • Snowflake Volunteer is a standalone Android app that allows users to lend their internet connections to others to create Snowflake proxies for accessing the Tor network; the user's mobile device becomes one of these proxies.
  • Snowflake Volunteer is described as a "single-purpose app that gives volunteers control over when and how they contribute."
  • Snowflake Volunteer is based on the Tor Project's Snowflake, which debuted in 2019.

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Why it matters

The Tor Project and its partners have shipped Snowflake as a standalone Android app, Snowflake Volunteer, on the Google Play Store, where anyone can install it and lend their connection as a proxy into the Tor network [1][3]. That moves proxy running from a task for people with spare bandwidth and the patience to configure a node into something closer to a one-tap install, and it makes the size of Tor's bridge pool partly a function of consumer app distribution [9][14][10].

The mechanics have not changed. Snowflake, which debuted in 2019, dresses a client's traffic up as a WebRTC video call and routes it through short-lived proxy connections that keep moving, which is harder for a censor to enumerate than a static server address [5][7]. When one proxy is blocked, the client jumps to another [8]. The pool is the product, so headcount is the metric. Neither Snowflake nor the new app is meant for people inside censored countries; both are for volunteers in places where Tor is still reachable [6].

The numbers are the interesting part, and they are modest. ZDNET reports that Tor counted roughly 1,300 unique proxy IP addresses active per day by May, after an April launch, rising to about 1,700 a month later, which the piece describes as a 29% month-over-month increase [11][12]. On the rounded figures given, the jump is 400 proxies, or about 31% [15]. The same report puts the historical peak above 2,100 daily active proxies, so the pool at 1,700 is running roughly 19% below its own high-water mark [13][16]. A distribution channel that reaches ordinary Android users is the plausible way to close that gap, and the app is deliberately narrow to make that easy: the developers call it a single-purpose app that gives volunteers control over when and how they contribute [4], and ZDNET's hands-on notes it surfaces a volunteer's contribution in real time [17][19].

The trade is a new dependency. A Play Store listing is one object in one company's catalogue, and a proxy network whose recruitment funnel runs through it inherits whatever happens to that listing. The hedge is already in place: Snowflake Volunteer is also on F-Droid, the code is open source, and developers can inspect it on GitHub or fork it [10]. Nothing in the source material says any government has moved against the listing, and we are not claiming one has. The structural point stands regardless, because the reason Snowflake is hard to block is that it has no fixed address to attack [7], while its main recruitment surface now does.

Worth watching: whether daily active proxies clear the 2,100 peak now that installation does not require technical knowledge [13][9], and whether growth from Play Store installs holds or decays as consumer apps usually do after a launch spike. Also worth watching is the split between Play and F-Droid installs, since that ratio is the practical measure of how much of the pool would survive a single store removal [10].

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