Is it possible for regular user of mastodon instance to retrieve his private key, which is used to sign posts which server sends to other instances?
Do any other activitypub implementations allows to retrieve it?

It could be used to make tips to content creators in . Like fetching a public key from user profile (which is already available), the use it to encrypt access to some token/ , and finally content creator could use his private key to collect .
At least, admins of self-hosted instances could do that)

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Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.