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And so does every other social media platform. Signal does so with hashes (https://support.signal.org/hc/en-us/articles/360007061452-Does-Signal-send-my-number-

And so does every other social media platform. Signal does so with hashes (https://support.signal.org/hc/en-us/articles/360007061452-Does-Signal-send-my-number-to-my-contacts- https://support.signal.org/hc/en-us/articles/360007061452-Do...), but there's so few phone numbers that it would be trivial to brute force or rainbow table all the possible values.

rio517 6y ago
I'm assuming signal is following best practice. How else could one match contacts without uploading some contact data?
- sleepyhead 6y ago
  There is no need to upload or match contacts in this case. It is a required step for inviting a new user. The invite SMS is even sent from the device, not by Clubhouse.
  - ljlolel 6y ago
    One of the recent versions sends it from Clubhouse servers not the device.
  - rio517 6y ago
    Oh! I see. I was thinking of matching users in your list with those already on the platform. In this case, that means N number of user already sent their contact list to clubhouse and club house is keeping and using that data.
- saagarjha 6y ago
  Signal's "best practice" for a while was to use special hardware that relied trusting Intel in the best case but in practice was also perpetually being broken into…
AlexandrB 6y ago
I wish Signal didn't use phone numbers as identifiers. That's the original sin of all these apps and the convenient excuse for uploading contacts
- kevincox 6y ago
  You don't need to use phone numbers as identifiers to upload contacts. For example Hangouts (RIP) and Matrix both support letting people find you by number without using it as a primary identifier. I assume that using numbers as identifiers has two main benefits 1. easy (insecure) auth 2. it forces everyone to provide you their number so that lookup by number works better. Of course I don't find these worth it. I have had 5 numbers so far and there is a decent chance I will switch numbers again. I don't like having an identifier that is tied to my physical location.
beaudin 6y ago
Public, the stock trading app does this as well. Same interface (your contact has x friends) but it seems this is a growing, and worrisome trend.

rio517 6y ago

I'm assuming signal is following best practice. How else could one match contacts without uploading some contact data?

sleepyhead 6y ago
There is no need to upload or match contacts in this case. It is a required step for inviting a new user. The invite SMS is even sent from the device, not by Clubhouse.
- ljlolel 6y ago
  One of the recent versions sends it from Clubhouse servers not the device.
- rio517 6y ago
  Oh! I see. I was thinking of matching users in your list with those already on the platform. In this case, that means N number of user already sent their contact list to clubhouse and club house is keeping and using that data.
saagarjha 6y ago
Signal's "best practice" for a while was to use special hardware that relied trusting Intel in the best case but in practice was also perpetually being broken into…

AlexandrB 6y ago

I wish Signal didn't use phone numbers as identifiers. That's the original sin of all these apps and the convenient excuse for uploading contacts

kevincox 6y ago
You don't need to use phone numbers as identifiers to upload contacts. For example Hangouts (RIP) and Matrix both support letting people find you by number without using it as a primary identifier. I assume that using numbers as identifiers has two main benefits 1. easy (insecure) auth 2. it forces everyone to provide you their number so that lookup by number works better. Of course I don't find these worth it. I have had 5 numbers so far and there is a decent chance I will switch numbers again. I don't like having an identifier that is tied to my physical location.

beaudin 6y ago

Public, the stock trading app does this as well. Same interface (your contact has x friends) but it seems this is a growing, and worrisome trend.