Checking the link provided in the previous answer or here, you can get to know that your transaction was put into a block numbered
Drilling deeper, this block was created by a miner node who gave her address as
0x5a0b54d5dc17e0aadc383d2db43b0a0d3e029c4c first. She then broadcasts it to her peers. Technically all the nodes who have received this block from the miner or eventually from any other peer node will run all the transactions in that block and validate it.
So you can say any node that received this particular block has validated your transaction.