I want to be able to achive this:
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a private key or its substitute (P) of a user wallet is stored on a server
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there're 100s of user wallets there, so there're 100s of (P) too
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let's say, it's ETH, SOL or any other major network
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server isn't a safe environment, as it's known
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there's also a main, admin wallet (M), in cold, local storage
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(P) must only be used to send outbound TXs to (M). Not anywhere else
This can't be achived with a normal private key, right? But how, if at all, it can be archived? Multisignature wallets?
The goal is automate withdrawals from the user wallets on a server, to make the process safer.
I don't consider any third-party solutions.
I'm a developer