The Signal App, which is open source, periodically sends truncated cryptographically hashed phone numbers to the Signal server, which is also open source. The server does not store the truncated hashes that the app sends to the server. So, they only temporarily have partial hashes which they do not store or share with anyone.
Is that right? I haven't seen things other than spirits use proof as a measurement rather than ABV. I don't know about Turkish kolnya but colognes are typically 70-90% ABV.
The Uniform Commercial Code [1] in the United States says that:
> A signature may be made (i) manually or by means of a device or machine, and (ii) by the use of any name, including a trade or assumed name, or by a word, mark, or symbol executed or adopted by a person with present intention to authenticate a writing.
IANAL but I would think that this program would fall under "by means of a device" and thus be considered valid.
