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Are you sure you're not thinking of Telegram? They had a thing called Telegram Open Platform or something (TOP rings a bell for some reason)

• _-david-_ 5y ago
  Signal has some coin https://support.signal.org/hc/en-us/articles/360057625692-In-app-Payments https://support.signal.org/hc/en-us/articles/360057625692-In...
  • millzlane 5y ago
    I think it's https://mobilecoin.com/ https://mobilecoin.com/