crt.sh

#!/bin/sh
# crt.sh api is very unreliable, don't rely on this in any scripts

if [ -z "$1" ]; then
  echo "Usage: $0 <domain>"
  exit 1
fi

data=$(curl -s "https://crt.sh/?q=$1&output=json" | jq -r '
  .[] |
  .entry_timestamp as $ts |
  .name_value | split("\n")[] as $name |
  "\($name)\t\($ts)"
' 2> /dev/null )
if [ -z "$data" ]; then
  echo "crt.sh broke."
  exit 1
fi

epoch_lines=""
while IFS=$'\t' read -r name ts; do
  ts_norm=${ts%T*}
  if ! epoch=$(date -d "$ts_norm" +%s 2>/dev/null); then
    echo "Could not parse date '$ts_norm' for '$name'" >&2
    continue
  fi
  epoch_lines+="$epoch"$'\t'"$ts_norm"$'\t'"$name"$'\n'
done <<< "$data"

sorted=$(echo "$epoch_lines" | sort -n | awk -F'\t' '!seen[$3]++ { print $2 "\t" $3 }')
echo "$sorted" | tac