Check Taproot Signalling

check_taproot_signalling.sh

#!/bin/bash

#
# This shell script allows you to check the Taproot signalling on your own
# Bitcoin fullnode (i.e. it does what https://taproot.watch/ does, but
# verified by your own node).
#
# Be a self-sovereign Bitcoiner!
#
# DON'T TRUST, VERIFY! :-)
#


# First check if we have the 'bitcoin-cli' and the 'jq' command available:
if ! command -v bitcoin-cli &> /dev/null
then
    echo "command 'bitcoin-cli' could not be found. Are you running this script on a Bitcoin node?"
    exit 1
fi
if ! command -v jq &> /dev/null
then
    echo "command 'jq' could not be found. It's needed to parse JSON output. Please install it."
    exit 1
fi

# Commandline argument "-v" enables verbose mode
if [[ "$1" = "-v" ]] ; then VERBOSE=1 ; else VERBOSE=0; fi


#
# Actual script starts HERE:
#

# Get current blockheight
CURRENT_BLOCKHEIGHT=$(bitcoin-cli getblockchaininfo | jq .headers)

# Difficulty periods always last 2016 blocks, so calculate 'blockheight modulo 2016'
# to find out how many blocks we already have in the current difficulty period
BLOCK_COUNT_IN_CURRENT_PERIOD=$((CURRENT_BLOCKHEIGHT % 2016))

# what is the first block in the current difficulty period
START_BLOCK_OF_CURRENT_PERIOD=$((CURRENT_BLOCKHEIGHT - BLOCK_COUNT_IN_CURRENT_PERIOD))


# initialize our counters
BLOCKS_SIGNALLING_FOR_TAPROOT=0
BLOCKS_NOT_SIGNALLING_FOR_TAPROOT=0


echo ""
echo "**************************************"
echo " Checking Taproot signalling status:"
echo "**************************************"
echo ""
echo "In the current difficulty period $BLOCK_COUNT_IN_CURRENT_PERIOD out of total 2016 blocks"
echo "have already been mined. We will check these $BLOCK_COUNT_IN_CURRENT_PERIOD blocks now,"
echo "if they signal for Taproot or not."
echo ""


# Now loop through all the blocks in the current period:
for (( height=$START_BLOCK_OF_CURRENT_PERIOD; height<=$CURRENT_BLOCKHEIGHT; height++ ))
do
    # get blockhash
    BLOCK_HASH=$(bitcoin-cli getblockhash $height)

    # get block-header and read out the 'version' field (this will be a decimal number)
    BLOCK_VERSION=$(bitcoin-cli getblockheader $BLOCK_HASH | jq .version)

    # we are interested in the single bits, so let's convert it to binary representation
    VERSION_IN_BINARY=$(echo "obase=2;$BLOCK_VERSION" | bc)

    # as leading zero's might be omitted, let's check how long the version string in binary is
    VERSION_LENGTH=${#VERSION_IN_BINARY}

    # Let's find the position of the Taproot bit:
    # The taproot bit is bit at index number 2.
    # the most-right bit is bit #0, then bit #1, then comes bit #2.
    # So the 3rd character from the right is the Taproot signal bit:
    INDEX_OF_TAPROOT_BIT=$(($VERSION_LENGTH-3))

    # cut out the single taproot bit
    TAPROOT_BIT=${VERSION_IN_BINARY:$INDEX_OF_TAPROOT_BIT:1}


    #
    # Print status per block! :)
    #

    # In default mode (non-verbose) insert a newline after every 56 blocks (just chosen because 2016 is divisible by 56):
    if [[ $VERBOSE -eq 0 && $((height % 56)) -eq 0 ]] ; then echo "" ; fi

    # In verbose mode ('-v') print some progress information:
    if [[ $VERBOSE -eq 1 ]] ; then echo -n "[$(($CURRENT_BLOCKHEIGHT-height)) blocks left to check]: " ; fi


    if [[ $TAPROOT_BIT = "1" ]]
    then
        # YES, signals taproot :-)

        # increase counter
        BLOCKS_SIGNALLING_FOR_TAPROOT=$(($BLOCKS_SIGNALLING_FOR_TAPROOT+1))

        if [[ $VERBOSE -eq 1 ]] ; then echo "Block number $height: ✅";
        else echo -n "✅"; fi

    else
        # No.. does not signal for Taproot.. :-(

        # increase counter
        BLOCKS_NOT_SIGNALLING_FOR_TAPROOT=$((BLOCKS_NOT_SIGNALLING_FOR_TAPROOT+1))

        if [[ $VERBOSE -eq 1 ]] ; then echo "Block number $height: 🛑 Oh Noooo... the block does NOT signal Taproot support. 😢";
        else echo -n "🛑"; fi

    fi

done



#
# Display some nice summary:
#
echo ""
echo ""
echo "*********************************************************************"
echo "  SUMMARY:"
echo ""
echo "  In the current difficulty period $BLOCK_COUNT_IN_CURRENT_PERIOD out of 2016 total blocks have been mined."
echo "  From these $BLOCK_COUNT_IN_CURRENT_PERIOD blocks $BLOCKS_SIGNALLING_FOR_TAPROOT are signalling Taproot support."
echo ""

# Less than 1815 signalling blocks:
if [[ $BLOCKS_SIGNALLING_FOR_TAPROOT -lt 1815 ]]
then
    echo "  Taproot is not locked in yet. 😢 1815 blocks need to signal, "
    echo "  so $((1815-$BLOCKS_SIGNALLING_FOR_TAPROOT)) signalling blocks are still missing. 😢"

else
    # 1815 or more signalling blocks!
    echo ""
    echo " 🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉"
    echo ""
    echo "     🤩  🤩  🤩  🤩    Y A Y ! ! !   🤩  🤩  🤩  🤩"
    echo "        😍 😍 😍  Taproot has LOCKED IN! 😍 😍 😍"
    echo ""
    echo "  ❤️ ️Taproot will be finally enabled in block number 709632!!  ❤️"
    echo ""
    echo " 🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉"
    echo ""
fi
echo ""
echo "*********************************************************************"
echo ""

The sha256sum of this file is expected to be b936271a924d4374a25f43638ae236f7cc87fd4d24497ce953d7edc639b743f9.

If you trust this file, you can directly execute it on your Raspiblitz, Umbrel, or any other Bitcoin fullnode with this single command:

[[ $(curl -s https://gist.githubusercontent.com/johnzweng/8bffc3d2d18ea140cd1c2a1c5763e154/raw/ | sha256sum) = "b936271a924d4374a25f43638ae236f7cc87fd4d24497ce953d7edc639b743f9  -" ]] && curl -s https://gist.githubusercontent.com/johnzweng/8bffc3d2d18ea140cd1c2a1c5763e154/raw/ | bash