user14876: Do full nodes verify the entire transaction chain up to coinbase when verifiying a single transaction to be included on the block which they are working on ?

user85: They achieve the same result as if they did this, though not by actually doing it. (There are a number of obvious optimizations, for example, maintaining an indexed database of unspent outputs.)

14876: <p>Do full nodes verify the entire transaction chain up to coinbase when verifiying a single transaction to be included on the block which they are working on ?</p>
 85: <p>They achieve the same result as if they did this, though not by actually doing it. (There are a number of obvious optimizations, for example, maintaining an indexed database of unspent outputs.)</p>
