This helps to free space:

#!/bin/bash
SRC="~/.hived/blockchain"
DST="/mnt/slowWfastR/hive"
for file in "$SRC"/block_log*; do
    if [[ -f "$file" ]]; then
        base=$(basename "$file")
        mv "$file" "$DST/$base"
        ln -s "$DST/$base" "$SRC/$base"
    fi
done