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A comment on I want a decentralized messenger which can delete msgs and sync between devices.

Re:I want a decentralized messenger which can delete msgs an... by ussrlongbow on Saturday January 30, 2021 @07:34PM (#25974515)
As it was already mentioned, such system is not able to provide guarantee, that your peer would not find a way to preserve a message.

Also such system already exists - email.

Check delta chat and/or chat over imap projects.

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Re:I want a decentralized messenger which can delete msgs an... by approxim8ion on Sunday January 31, 2021 @03:44PM (#25982398)
Delta chat fails at least 4 of the 7 parameters OP mentioned though.
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