Revert "Utilize Client Serials instead of passing raw indexes."

This reverts commit ab1e03061b34c5fb2516d20e77994fb388cb15bc.
Utilize Client Serials for security, prevent leakage/bugs.

This should fix a few native errors, and ultimately act as a more stable method of protecting client data/sanity. Targets (issuers) can change during the query delay, along with many other things. It's definitely not something that's good, which is what this commit is attempting to change.