hashdeep lets you compare hashes of whole directories!

pretty neat yeah, it even works on windows so you can choco install hashdeep

Get the hashes

• apt-get install hashdeep
• cd /home/user/folder
• hashdeep -l -e -r . > output.txt

compare the hashes

• hashdeep -r -a -k output.txt .

more info
https://linhost.info/2010/05/using-hashdeep-to-ensure-data-integrity/