Change key value of NewBlockOperationFrozenLinkedKey

We need to change the key of NewBlockOperationFrozenLinkedKey.
Currently it consists of linked address + height.
To prevent error in key value for same linked key in same height,
it is necessary to add some unique value within a blockheight to the end of linked key.

Locate NewBlockOperationFrozenLinkedKey and inspect where its key is constructed and consumed. Determine how a unique value within a block height should be represented, then verify that multiple linked keys at the same height no longer collide and that existing key users remain consistent.

Written by the indexing model from the issue text.