[Bitcoin Full Node Setup via Bash] Bitcoin Full Node setup install #bash #bitcoin #setup

Bitcoin Full Node Setup via Bash.txt

https://gist.github.com/System-Glitch/cb4e87bf1ae3fec9925725bb3ebe223a

How to Bitcoin regtest
Setup
Download bitcoin core
Unpack it wherever you want.
Create a directory named data inside the unpacked folder.
Create a directory named .bitcoin inside your home folder: mkdir ~/.bitcoin
Copy bitcoin.conf into ~/.bitcoin
Copy rpcauth into <unpacked_folder>/share/rpcauth
Run <unpacked_folder>/share/rpcauth/rpcauth.py <YOUR_USERNAME>. Keep the output somewhere, you'll need it later.
Edit your bitcoin.conf.
Uncomment regtest=0 and enable it: regtest=1
Uncomment rpcuser=alice and replace the value with your username.
Uncomment rpcpassword=... and replace the value with the password you got from rpcauth.
Uncomment rpcauth=bob:... and replace the value with the line you got from rpcauth.
(Optional) Append datadir=<unpacked_folder>/data to the end of the file, where <unpacked_folder> is the absolute path to your unpacked folder.
Run <unpacked_folder>/bin/bitcoind
Open another terminal, and run <unpacked_folder>/bin/bitcoin-cli getbalance. It should return 0.
Your first node is set. Now let's setup another one to connect to. We need to use another port and another data dir.

Run: bitcoind -port=18445 -rpcport=8333 -datadir=<unpacked_folder>/data2

Generate a new address
We'll start by generating a new wallet address. We will use it for all our future operations, so keep it somewhere.

bitcoin-cli getnewaddress
Generate some blocks
bitcoin-cli generatetoaddress 50 <youraddress>

# Check the blocks are mined
bitcoin-cli getblockcount # Should return 50
Connect to other nodes
Let's connect to our second node: bitcoin-cli addnode "127.0.0.1:18445" add.
To keep the connection after a restart, add the following to your bitcoin.conf: addnode=127.0.0.1:18445

Check if your nodes are connected: bitcoin-cli getaddednodeinfo.

Now check if the second node is synchronized: bitcoin-cli -rpcport=8333 getblockcount.

Let's mine some blocks and check if everything is synchronized:

bitcoin-cli generatetoaddress 25 "<your_address>"
bitcoin-cli getblockcount # Should return 75
bitcoin-cli -rpcport=8333 getblockcount # Should return 75 
Transfer funds
We got some funds from mining the first blocks. We will transfer them to our wallet on the second node.

address=`bitcoin-cli -rpcport=8333 getnewaddress`
bitcoin-cli sendtoaddress "$1" 10

# Check the funds have been received
bitcoin-cli -rpcport=8333 getwalletinfo
Double spend
As we only have two nodes in the network, it's easy to make a 51% attack. We're going to double spend some bitcoin.

# Get a unspent output with a non-zero output
bitcoin-cli listunspent

# Create a raw transaction and sign it
# Don't forget to set the amount of your vout a little bit lower than the amount of your utxo so your tx has fees
transaction=`bitcoin-cli createrawtransaction '[{"txid":"<TX_ID>","vout":0}]' '{"$address":12.49}'`
bitcoin-cli signrawtransactionwithwallet "$transaction"
Keep the generated hex of the signed transaction. We need to disconnect both nodes and broadcast the transaction from the other node.

# Disconnect nodes
bitcoin-cli disconnectnode "127.0.0.1:18445"
bitcoin-cli -rpcport=8333 disconnectnode "127.0.0.1:18444"

# Broadcast from other node
bitcoin-cli -rpcport=8333 sendrawtransaction "<HEX>"
To make a double spend, we need to create another transaction with the same utxo and broadcast it on the chain where the first one wasn't broadcasted.

# Generate a second address to make it easier to differenciate both transactions
address=`bitcoin-cli -rpcport=8333 getnewaddress`

transaction=`bitcoin-cli createrawtransaction '[{"txid":"<TX_ID>","vout":0}]' '{"$address":12.49}'`
bitcoin-cli signrawtransactionwithwallet "$transaction"
bitcoin-cli sendrawtransaction "<HEX>"
We need to mine some blocks so when we join the two nodes, the longest chain is kept. (In our case, the one with the second transaction).

bitcoin-cli generate 50

# Join
bitcoin-cli addnode "127.0.0.1:18445" add
Check that the first transaction doesn't exist anymore:

bitcoin-cli -rpcport=8333 listtransactions
The last one should have the address we used for the second transaction. The double-spend worked!

bitcoin-install-full-node.sh

# https://bitnodes.io/install-full-node.sh

# Start a Bitcoin full node on your Linux, Mac, BSD or Windows system to help validate and relay transactions across the Bitcoin network by running this command:
# curl https://bitnodes.io/install-full-node.sh | sh

#!/bin/sh

###############################################################################
#
#                             install-full-node.sh
#
# This is the install script for Bitcoin full node based on Bitcoin Core.
#
# This script attempts to make your node automatically reachable by other nodes
# in the network. This is done by using uPnP to open port 8333 on your router
# to accept incoming connections to port 8333 and route the connections to your
# node running inside your local network.
#
# For security reason, wallet functionality is not enabled by default.
#
# Supported OS: Linux, Mac OS X, BSD, Windows (Windows Subsystem for Linux)
# Supported platforms: x86, x86_64, ARM
#
# Usage:
#   Open your terminal and type:
#
#     curl https://bitnodes.io/install-full-node.sh | sh
#
# Bitcoin Core will be installed using binaries provided by bitcoin.org.
#
# If the binaries for your system are not available, the installer will attempt
# to build and install Bitcoin Core from source.
#
# All files will be installed into $HOME/bitcoin-core directory. Layout of this
# directory after the installation is shown below:
#
# Source files:
#   $HOME/bitcoin-core/bitcoin/
#
# Binaries:
#   $HOME/bitcoin-core/bin/
#
# Configuration file:
#   $HOME/bitcoin-core/.bitcoin/bitcoin.conf
#
# Blockchain data files:
#   $HOME/bitcoin-core/.bitcoin/blocks
#   $HOME/bitcoin-core/.bitcoin/chainstate
#
# Need help? Contact ayeowch+bitnodes.io@gmail.com
#
###############################################################################

REPO_URL="https://github.com/bitcoin/bitcoin.git"

# See https://github.com/bitcoin/bitcoin/tags for latest version.
VERSION=22.0

TARGET_DIR=$HOME/bitcoin-core
PORT=8333

BUILD=0
UNINSTALL=0

BLUE='\033[94m'
GREEN='\033[32;1m'
YELLOW='\033[33;1m'
RED='\033[91;1m'
RESET='\033[0m'

ARCH=$(uname -m)
SYSTEM=$(uname -s)
MAKE="make"
if [ "$SYSTEM" = "FreeBSD" ]; then
    MAKE="gmake"
fi
SUDO=""

usage() {
    cat <<EOF

This is the install script for Bitcoin full node based on Bitcoin Core.

Usage: $0 [-h] [-v <version>] [-t <target_directory>] [-p <port>] [-b] [-u]

-h
    Print usage.

-v <version>
    Version of Bitcoin Core to install.
    Default: $VERSION

-t <target_directory>
    Target directory for source files and binaries.
    Default: $HOME/bitcoin-core

-p <port>
    Bitcoin Core listening port.
    Default: $PORT

-b
    Build and install Bitcoin Core from source.
    Default: $BUILD

-u
    Uninstall Bitcoin Core.

EOF
}

print_info() {
    printf "$BLUE$1$RESET\n"
}

print_success() {
    printf "$GREEN$1$RESET\n"
    sleep 1
}

print_warning() {
    printf "$YELLOW$1$RESET\n"
}

print_error() {
    printf "$RED$1$RESET\n"
    sleep 1
}

print_start() {
    print_info "Start date: $(date)"
}

print_end() {
    print_info "\nEnd date: $(date)"
}

print_readme() {
    cat <<EOF

# README

To stop Bitcoin Core:

    cd $TARGET_DIR/bin && ./stop.sh

To start Bitcoin Core again:

    cd $TARGET_DIR/bin && ./start.sh

To use bitcoin-cli program:

    cd $TARGET_DIR/bin && ./bitcoin-cli -conf=$TARGET_DIR/.bitcoin/bitcoin.conf getnetworkinfo

To view Bitcoin Core log file:

    tail -f $TARGET_DIR/.bitcoin/debug.log

To uninstall Bitcoin Core:

    ./install-full-node.sh -u

EOF
}

program_exists() {
    type "$1" > /dev/null 2>&1
    return $?
}

create_target_dir() {
    if [ ! -d "$TARGET_DIR" ]; then
        print_info "\nCreating target directory: $TARGET_DIR"
        mkdir -p $TARGET_DIR
    fi
}

init_system_install() {
    if [ $(id -u) -ne 0 ]; then
        if program_exists "sudo"; then
            SUDO="sudo"
            print_info "\nInstalling required system packages.."
        else
            print_error "\nsudo program is required to install system packages. Please install sudo as root and rerun this script as normal user."
            exit 1
        fi
    fi
}

install_miniupnpc() {
    print_info "Installing miniupnpc from source.."
    rm -rf miniupnpc-2.0 miniupnpc-2.0.tar.gz &&
        wget -q http://miniupnp.free.fr/files/download.php?file=miniupnpc-2.0.tar.gz -O miniupnpc-2.0.tar.gz && \
        tar xzf miniupnpc-2.0.tar.gz && \
        cd miniupnpc-2.0 && \
        $SUDO $MAKE install > build.out 2>&1 && \
        cd .. && \
        rm -rf miniupnpc-2.0 miniupnpc-2.0.tar.gz
}

install_debian_build_dependencies() {
    $SUDO apt-get update
    $SUDO apt-get install -y \
        automake \
        autotools-dev \
        build-essential \
        curl \
        git \
        libboost-all-dev \
        libevent-dev \
        libminiupnpc-dev \
        libssl-dev \
        libtool \
        pkg-config
}

install_fedora_build_dependencies() {
    $SUDO dnf install -y \
        automake \
        boost-devel \
        curl \
        gcc-c++ \
        git \
        libevent-devel \
        libtool \
        miniupnpc-devel \
        openssl-devel
}

install_centos_build_dependencies() {
    $SUDO yum install -y \
        automake \
        boost-devel \
        curl \
        gcc-c++ \
        git \
        libevent-devel \
        libtool \
        openssl-devel
    install_miniupnpc
    echo '/usr/lib' | $SUDO tee /etc/ld.so.conf.d/miniupnpc-x86.conf > /dev/null && $SUDO ldconfig
}

install_archlinux_build_dependencies() {
    $SUDO pacman -S --noconfirm \
        automake \
        boost \
        curl \
        git \
        libevent \
        libtool \
        miniupnpc \
        openssl
}

install_alpine_build_dependencies() {
    $SUDO apk update
    $SUDO apk add \
        autoconf \
        automake \
        boost-dev \
        build-base \
        curl \
        git \
        libevent-dev \
        libtool \
        openssl-dev
    install_miniupnpc
}

install_mac_build_dependencies() {
    if ! program_exists "gcc"; then
        print_info "When the popup appears, click 'Install' to install the XCode Command Line Tools."
        xcode-select --install
    fi

    if ! program_exists "brew"; then
        /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
    fi

    brew install \
        --c++11 \
        automake \
        boost \
        libevent \
        libtool \
        miniupnpc \
        openssl \
        pkg-config
}

install_freebsd_build_dependencies() {
    $SUDO pkg install -y \
        autoconf \
        automake \
        boost-libs \
        curl \
        git \
        gmake \
        libevent2 \
        libtool \
        openssl \
        pkgconf \
        wget
    install_miniupnpc
}

install_build_dependencies() {
    init_system_install
    case "$SYSTEM" in
        Linux)
            if program_exists "apt-get"; then
                install_debian_build_dependencies
            elif program_exists "dnf"; then
                install_fedora_build_dependencies
            elif program_exists "yum"; then
                install_centos_build_dependencies
            elif program_exists "pacman"; then
                install_archlinux_build_dependencies
            elif program_exists "apk"; then
                install_alpine_build_dependencies
            else
                print_error "\nSorry, your system is not supported by this installer."
                exit 1
            fi
            ;;
        Darwin)
            install_mac_build_dependencies
            ;;
        FreeBSD)
            install_freebsd_build_dependencies
            ;;
        *)
            print_error "\nSorry, your system is not supported by this installer."
            exit 1
            ;;
    esac
}

build_bitcoin_core() {
    cd $TARGET_DIR

    if [ ! -d "$TARGET_DIR/bitcoin" ]; then
        print_info "\nDownloading Bitcoin Core source files.."
        git clone --quiet $REPO_URL
    fi

    # Tune gcc to use less memory on single board computers.
    cxxflags=""
    if [ "$SYSTEM" = "Linux" ]; then
        ram_kb=$(grep MemTotal /proc/meminfo | awk '{print $2}')
        if [ $ram_kb -lt 1500000 ]; then
            cxxflags="--param ggc-min-expand=1 --param ggc-min-heapsize=32768"
        fi
    fi

    print_info "\nBuilding Bitcoin Core v$VERSION"
    print_info "Build output: $TARGET_DIR/bitcoin/build.out"
    print_info "This can take up to an hour or more.."
    rm -f build.out
    cd bitcoin &&
        git fetch > build.out 2>&1 &&
        git checkout "v$VERSION" 1>> build.out 2>&1 &&
        git clean -f -d -x 1>> build.out 2>&1 &&
        ./autogen.sh 1>> build.out 2>&1 &&
        ./configure \
            CXXFLAGS="$cxxflags" \
            --without-gui \
            --with-miniupnpc \
            --disable-wallet \
            --disable-tests \
            --enable-upnp-default \
            1>> build.out 2>&1 &&
        $MAKE 1>> build.out 2>&1

    if [ ! -f "$TARGET_DIR/bitcoin/src/bitcoind" ]; then
        print_error "Build failed. See $TARGET_DIR/bitcoin/build.out"
        exit 1
    fi

    sleep 1

    $TARGET_DIR/bitcoin/src/bitcoind -? > /dev/null
    retcode=$?
    if [ $retcode -ne 1 ]; then
        print_error "Failed to execute $TARGET_DIR/bitcoin/src/bitcoind. See $TARGET_DIR/bitcoin/build.out"
        exit 1
    fi
}

get_bin_url() {
    url="https://bitcoincore.org/bin/bitcoin-core-$VERSION"
    case "$SYSTEM" in
        Linux)
            if program_exists "apk"; then
                echo ""
            elif [ "$ARCH" = "armv7l" ]; then
                url="$url/bitcoin-$VERSION-arm-linux-gnueabihf.tar.gz"
                echo "$url"
            else
                url="$url/bitcoin-$VERSION-$ARCH-linux-gnu.tar.gz"
                echo "$url"
            fi
            ;;
        Darwin)
            url="$url/bitcoin-$VERSION-osx64.tar.gz"
            echo "$url"
            ;;
        FreeBSD)
            echo ""
            ;;
        *)
            echo ""
            ;;
    esac
}

download_bin() {
    checksum_url="https://bitcoincore.org/bin/bitcoin-core-$VERSION/SHA256SUMS"

    cd $TARGET_DIR

    rm -f bitcoin-$VERSION.tar.gz checksum.asc

    print_info "\nDownloading Bitcoin Core binaries.."
    if program_exists "wget"; then
        wget -q "$1" -O bitcoin-$VERSION.tar.gz &&
            wget -q "$checksum_url" -O checksum.asc &&
            mkdir -p bitcoin-$VERSION &&
            tar xzf bitcoin-$VERSION.tar.gz -C bitcoin-$VERSION --strip-components=1
    elif program_exists "curl"; then
        curl -s "$1" -o bitcoin-$VERSION.tar.gz &&
            curl -s "$checksum_url" -o checksum.asc &&
            mkdir -p bitcoin-$VERSION &&
            tar xzf bitcoin-$VERSION.tar.gz -C bitcoin-$VERSION --strip-components=1
    else
        print_error "\nwget or curl program is required to continue. Please install wget or curl as root and rerun this script as normal user."
        exit 1
    fi

    if program_exists "shasum"; then
        checksum=$(shasum -a 256 bitcoin-$VERSION.tar.gz | awk '{ print $1 }')
        if grep -q "$checksum" checksum.asc; then
            print_success "Checksum passed: bitcoin-$VERSION.tar.gz ($checksum)"
        else
            print_error "Checksum failed: bitcoin-$VERSION.tar.gz ($checksum). Please rerun this script to download and validate the binaries again."
            exit 1
        fi
    fi

    rm -f bitcoin-$VERSION.tar.gz checksum.asc
}

install_bitcoin_core() {
    cd $TARGET_DIR

    print_info "\nInstalling Bitcoin Core v$VERSION"

    if [ ! -d "$TARGET_DIR/bin" ]; then
        mkdir -p $TARGET_DIR/bin
    fi

    if [ ! -d "$TARGET_DIR/.bitcoin" ]; then
        mkdir -p $TARGET_DIR/.bitcoin
    fi

    if [ "$SYSTEM" = "Darwin" ]; then
        if [ ! -e "$HOME/Library/Application Support/Bitcoin" ]; then
            ln -s $TARGET_DIR/.bitcoin "$HOME/Library/Application Support/Bitcoin"
        fi
    else
        if [ ! -e "$HOME/.bitcoin" ]; then
            ln -s $TARGET_DIR/.bitcoin $HOME/.bitcoin
        fi
    fi

    if [ -f "$TARGET_DIR/bitcoin/src/bitcoind" ]; then
        # Install compiled binaries.
        cp "$TARGET_DIR/bitcoin/src/bitcoind" "$TARGET_DIR/bin/" &&
            cp "$TARGET_DIR/bitcoin/src/bitcoin-cli" "$TARGET_DIR/bin/" &&
            print_success "Bitcoin Core v$VERSION (compiled) installed successfully!"
    elif [ -f "$TARGET_DIR/bitcoin-$VERSION/bin/bitcoind" ]; then
        # Install downloaded binaries.
        cp "$TARGET_DIR/bitcoin-$VERSION/bin/bitcoind" "$TARGET_DIR/bin/" &&
            cp "$TARGET_DIR/bitcoin-$VERSION/bin/bitcoin-cli" "$TARGET_DIR/bin/" &&
                rm -rf "$TARGET_DIR/bitcoin-$VERSION"
            print_success "Bitcoin Core v$VERSION (binaries) installed successfully!"
    else
        print_error "Cannot find files to install."
        exit 1
    fi

    cat > $TARGET_DIR/.bitcoin/bitcoin.conf <<EOF
### IPv4/IPv6 mode ###
# This mode requires uPnP feature on your router to allow Bitcoin Core to accept incoming connections.
bind=0.0.0.0
upnp=1

### Tor mode ###
# This mode requires tor (https://www.torproject.org/download/) to be running at the proxy address below.
# No configuration is needed on your router to allow Bitcoin Core to accept incoming connections.
#proxy=127.0.0.1:9050
#bind=127.0.0.1
#onlynet=onion

listen=1
port=$PORT
maxconnections=64

dbcache=64
par=2
checkblocks=24
checklevel=0

disablewallet=1

rpccookiefile=$TARGET_DIR/.bitcoin/.cookie
rpcbind=127.0.0.1
rpcport=8332
rpcallowip=127.0.0.1
EOF
    chmod go-rw $TARGET_DIR/.bitcoin/bitcoin.conf

    cat > $TARGET_DIR/bin/start.sh <<EOF
#!/bin/sh
if [ -f $TARGET_DIR/bin/bitcoind ]; then
    $TARGET_DIR/bin/bitcoind -conf=$TARGET_DIR/.bitcoin/bitcoin.conf -datadir=$TARGET_DIR/.bitcoin -daemon
fi
EOF
    chmod ugo+x $TARGET_DIR/bin/start.sh

    cat > $TARGET_DIR/bin/stop.sh <<EOF
#!/bin/sh
if [ -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
    kill \$(cat $TARGET_DIR/.bitcoin/bitcoind.pid)
fi
EOF
    chmod ugo+x $TARGET_DIR/bin/stop.sh
}

start_bitcoin_core() {
    if [ ! -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
        print_info "\nStarting Bitcoin Core.."
        cd $TARGET_DIR/bin && ./start.sh

        timer=0
        until [ -f $TARGET_DIR/.bitcoin/bitcoind.pid ] || [ $timer -eq 5 ]; do
            timer=$((timer + 1))
            sleep $timer
        done

        if [ -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
            print_success "Bitcoin Core is running!"
        else
            print_error "Failed to start Bitcoin Core."
            exit 1
        fi
    fi
}

stop_bitcoin_core() {
    if [ -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
        print_info "\nStopping Bitcoin Core.."
        cd $TARGET_DIR/bin && ./stop.sh

        timer=0
        until [ ! -f $TARGET_DIR/.bitcoin/bitcoind.pid ] || [ $timer -eq 120 ]; do
            timer=$((timer + 1))
            sleep $timer
        done

        if [ ! -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
            print_success "Bitcoin Core stopped."
        else
            print_error "Failed to stop Bitcoin Core."
            exit 1
        fi
    fi
}

check_bitcoin_core() {
    if [ -f $TARGET_DIR/.bitcoin/bitcoind.pid ]; then
        if [ -f $TARGET_DIR/bin/bitcoin-cli ]; then
            print_info "\nChecking Bitcoin Core.."
            sleep 5
            $TARGET_DIR/bin/bitcoin-cli -conf=$TARGET_DIR/.bitcoin/bitcoin.conf -datadir=$TARGET_DIR/.bitcoin getnetworkinfo
        fi

        reachable=$(curl -I https://bitnodes.io/api/v1/nodes/me-$PORT/ 2> /dev/null | head -n 1 | cut -d ' ' -f2)
        if [ $reachable -eq 200 ]; then
            print_success "Bitcoin Core is accepting incoming connections at port $PORT!"
        else
            print_warning "Bitcoin Core is not accepting incoming connections at port $PORT. You may need to configure port forwarding (https://bitcoin.org/en/full-node#port-forwarding) on your router."
        fi
    fi
}

uninstall_bitcoin_core() {
    stop_bitcoin_core

    if [ -d "$TARGET_DIR" ]; then
        print_info "\nUninstalling Bitcoin Core.."
        rm -rf $TARGET_DIR

        # Remove stale symlink.
        if [ "$SYSTEM" = "Darwin" ]; then
            if [ -L "$HOME/Library/Application Support/Bitcoin" ] && [ ! -d "$HOME/Library/Application Support/Bitcoin" ]; then
                rm "$HOME/Library/Application Support/Bitcoin"
            fi
        else
            if [ -L $HOME/.bitcoin ] && [ ! -d $HOME/.bitcoin ]; then
                rm $HOME/.bitcoin
            fi
        fi

        if [ ! -d "$TARGET_DIR" ]; then
            print_success "Bitcoin Core uninstalled successfully!"
        else
            print_error "Uninstallation failed. Is Bitcoin Core still running?"
            exit 1
        fi
    else
        print_error "Bitcoin Core not installed."
    fi
}

while getopts ":v:t:p:bu" opt
do
    case "$opt" in
        v)
            VERSION=${OPTARG}
            ;;
        t)
            TARGET_DIR=${OPTARG}
            ;;
        p)
            PORT=${OPTARG}
            ;;
        b)
            BUILD=1
            ;;
        u)
            UNINSTALL=1
            ;;
        h)
            usage
            exit 0
            ;;
        ?)
            usage >& 2
            exit 1
            ;;
    esac
done

WELCOME_TEXT=$(cat <<EOF

Welcome!

You are about to install a Bitcoin full node based on Bitcoin Core v$VERSION.

All files will be installed under $TARGET_DIR directory.

Your node will be configured to accept incoming connections from other nodes in
the Bitcoin network by using uPnP feature on your router.

For security reason, wallet functionality is not enabled by default.

After the installation, it may take several hours for your node to download a
full copy of the blockchain.

If you wish to uninstall Bitcoin Core later, you can download this script and
run "sh install-full-node.sh -u".

EOF
)

print_start

if [ $UNINSTALL -eq 1 ]; then
    echo
    read -p "WARNING: This will stop Bitcoin Core and uninstall it from your system. Uninstall? (y/n) " answer
    if [ "$answer" = "y" ]; then
        uninstall_bitcoin_core
    fi
else
    echo "$WELCOME_TEXT"
    if [ -t 0 ]; then
        # Prompt for confirmation when invoked in tty.
        echo
        read -p "Install? (y/n) " answer
    else
        # Continue installation when invoked via pipe, e.g. curl .. | sh
        answer="y"
        echo
        echo "Starting installation in 10 seconds.."
        sleep 10
    fi
    if [ "$answer" = "y" ]; then
        if [ "$BUILD" -eq 0 ]; then
            bin_url=$(get_bin_url)
        else
            bin_url=""
        fi
        stop_bitcoin_core
        create_target_dir
        if [ "$bin_url" != "" ]; then
            download_bin "$bin_url"
        else
            install_build_dependencies && build_bitcoin_core
        fi
        install_bitcoin_core && start_bitcoin_core && check_bitcoin_core
        print_readme > $TARGET_DIR/README.md
        cat $TARGET_DIR/README.md
        print_success "If this your first install, Bitcoin Core may take several hours to download a full copy of the blockchain."
        print_success "\nInstallation completed!"
    fi
fi

print_end