How does your wallet verify that a tx sent to your wallet is valid? How does it know the inputs in the tx are in the UTXO set if it hasn’t verified the whole blockchain?
Discussion
Can't it ask for the blocks this transaction's coins are coming from? If all 10 connected nodes send the same old blocks, it's which trustworthy. There is always a risk, but nothing that simply warning msg can't solve. It's similar to the 0-conf stuff.