Calculates the hash of a bitcoin block. Adapted from https://github.com/jaymine/Bitcoin-Hash-verifier.
$ python bitcoinHash.py -u https://blockchain.info/rawblock/000000000000000000046308409bb6a9fe11d98529efd3c50ba0445e06bc8746
$ python bitcoinHash.py -f 000000000000000000046308409bb6a9fe11d98529efd3c50ba0445e06bc8746.json
options:
-h, --help show this help message and exit
-v, --verbose display intermediate hash
-f FILE, --file FILE read the block from a json file
-u URL, --url URL read the block from a URL