Find block containing the biggest OP_RETURN

biggest_op_return_block.sh

#!/bin/bash
# First OP_RETURN is expected in March 2014 (~290,000)
# https://arxiv.org/pdf/1702.01024
n=`bitcoin-cli getblockcount`
record=0
for height in $(seq 0 $n)
do
    if (( $height % 1000 == 0 )); then
        echo "Checking block $height..."
    fi
    hash=`bitcoin-cli getblockhash $height`
    biggest=`bitcoin-cli getblock $hash 2 | jq '[.tx[].vout[] | select(.scriptPubKey.type == "nulldata") | .scriptPubKey.hex | length / 2] | max'`
    if (( biggest > record )); then
        record=$biggest
        echo "Block $height: ~$record"
    fi
done