Solana Security

Security question: If deploying a contract can take 100-1000x transactions, then how does upgrading a contract work for that same number of transactions?

Will the contract still function? As its old version? Or do you upload to a buffer and switch to it in 1 tx instead?

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Currently: WhatsABI

That would be the sensible option, right? Still trying to find docs on it

Might have to dig into the source code

I believe it's the latter, you upload it into storage buffers then swap the pointer in the final transaction.