From the dev docs:

"Once stellar-core receives a transaction, either given to it by a user or another stellar-core, it does preliminary checks to see if the transaction is valid. Among other checks, it makes sure that the transaction is correctly formed and the source account has enough to cover the transaction fee.

Stellar-core doesn’t check things that require inspecting the state of the ledger beyond looking up the source account—e.g., that the destination account to which the transaction is trying to send exists, that the account has enough of this asset to sell, that it’s a valid path."

So who checks that these aspects are legitimate? How does Stellar protocol prevent overspend attempts?

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