Why does a thin node need to know if a transaction is present in specific block's merkle tree?
I understand what a merkle root is and how merkle proofs work.
It's all about thin nodes checking whether a specific transaction ID is in a specific block. So, thin node says: I have a transaction ID - 12345 and I want to know if this transaction is present in 259,291th block.
Why would a thin node want to know information like this ?