NIST Randomness Beacon Example

nist-randomness-beacon-eg.sh

#!/usr/bin/env bash
# nist-randomness-beacon-eg.sh
# --------------------------------------------------------------------------------
#
# Output:
#   Datetime: 2022-10-06T11:58:07
#   Previous: 29B7969259B18... 
#    Current: 97B0CAC685FD4...
#
# Resources:
#   - https://beacon.nist.gov/home
#   - https://csrc.nist.gov/projects/interoperable-randomness-beacons

# Print datetime
printf "%s\n" "Datetime: $(date +'%FT%H:%M:%S')"

# Get some randomness
#   Prints only the current and previous values
#   Execute a few times around 58-04s to witness the pulse iterate the values
curl -s https://beacon.nist.gov/beacon/2.0/pulse/last | jq -r '"Previous: \(.pulse.listValues[] | select(.type=="previous") | .value) \n Current: \(.pulse.outputValue)"'