https://www.inverse.com/input/guides/how-to-protect-signal-account-hack-registration-lock-twilio
How to protect your Signal account with Registration Lock
Aug 16, 2022 - A recent Twilio breach exposed thousands of Signal users' phone numbers. It's time to lock down your Signal account — here's how.
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https://signal.org/blog/improving-registration-lock/
Signal Blog Improving Registration Lock with Secure Value Recovery
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