As part of the block scanner proof of concept we want to scan the first 10 blocks of the blockchain for the zecpages viewing key. While we do not anticipate finding any related transactions, this process is important for converting a string into a sapling key that is compatible with the ECC crate's scanning function.

The code available at #7812 may be useful for this task.

This is all test code by now, convertion code could be moved to zebra-chain in a later ticket if decided.

This task is a smaller component of a larger issue .

Completition of this and the merge of #7758 will close #7727