last-block-of-year.sh

#!/bin/bash -eu

## Year with the final blocks we want to check.
## Replace with "2024" for market
YEAR=2022
## Block to start scanning backwards from. Replace with "" (empty) to
## scan all blocks.  Use "" (empty) for market
START_BLOCK="770000"

year_epoch=$( date -d "$YEAR-12-31" +%s )

## Get block to start scanning backwards from
if [ "$START_BLOCK" ] ; then
  hash=$( bitcoin-cli getblockhash $START_BLOCK )
else
  hash=$( bitcoin-cli getbestblockhash )
fi

past_blocks_checked=0
until [ $( bitcoin-cli getblock $hash | jq .time ) -lt $year_epoch ]; do
  echo -n .
  hash=$( bitcoin-cli getblock $hash | jq -r .previousblockhash )
  past_blocks_checked=$(( past_blocks_checked + 1 ))
done
echo

echo "Blocks checked (must be >30 to settle market): $past_blocks_checked"
echo "Hash of last block in $YEAR: $hash"