anchorage_layer_simple/export-backup.sh

#!/bin/bash

# Script to export mining private key and wallet descriptors with private keys for backup
# Author: 4NK Team
# Date: 2026-01-23

set -e

CONTAINER_NAME="bitcoin-signet-instance"
# Use BITCOIN_DIR from container so we talk to the same datadir as bitcoind
DATADIR=""
WALLET_NAME="custom_signet"
BACKUP_DIR="./backups"
TIMESTAMP=$(date +%Y%m%d_%H%M%S)
BACKUP_FILE="${BACKUP_DIR}/backup_${TIMESTAMP}.txt"

# Create backup directory if it doesn't exist
mkdir -p "${BACKUP_DIR}"

echo "=== Exporting Bitcoin Signet Backup ==="
echo "Container: ${CONTAINER_NAME}"
echo "Backup file: ${BACKUP_FILE}"
echo ""

# Check if container is running
if ! sudo docker ps --format "{{.Names}}" | grep -q "^${CONTAINER_NAME}$"; then
    echo "Error: Container ${CONTAINER_NAME} is not running"
    exit 1
fi

DATADIR=$(sudo docker exec "$CONTAINER_NAME" printenv BITCOIN_DIR 2>/dev/null || echo "/root/.bitcoin")

# Start backup file with header
cat > "${BACKUP_FILE}" << EOF
# Bitcoin Signet Backup
# Generated: $(date -Iseconds)
# Container: ${CONTAINER_NAME}
#
# WARNING: This file contains private keys. Keep it secure and encrypted.
# ======================================================================

EOF

# Export PRIVKEY (mining private key)
echo "1. Exporting mining private key (PRIVKEY)..."
PRIVKEY=$(sudo docker exec ${CONTAINER_NAME} cat ${DATADIR}/PRIVKEY.txt 2>/dev/null || echo "")
if [[ -n "${PRIVKEY}" ]]; then
    cat >> "${BACKUP_FILE}" << EOF
## Mining Private Key (PRIVKEY)
PRIVKEY=${PRIVKEY}

EOF
    echo "   ✓ PRIVKEY exported"
else
    echo "   ⚠ PRIVKEY not found in container"
    cat >> "${BACKUP_FILE}" << EOF
## Mining Private Key (PRIVKEY)
# PRIVKEY not found in container

EOF
fi

# Export SIGNETCHALLENGE
echo "2. Exporting SIGNETCHALLENGE..."
SIGNETCHALLENGE=$(sudo docker exec ${CONTAINER_NAME} cat ${DATADIR}/SIGNETCHALLENGE.txt 2>/dev/null || echo "")
if [[ -n "${SIGNETCHALLENGE}" ]]; then
    cat >> "${BACKUP_FILE}" << EOF
## Signet Challenge
SIGNETCHALLENGE=${SIGNETCHALLENGE}

EOF
    echo "   ✓ SIGNETCHALLENGE exported"
else
    echo "   ⚠ SIGNETCHALLENGE not found in container"
    cat >> "${BACKUP_FILE}" << EOF
## Signet Challenge
# SIGNETCHALLENGE not found in container

EOF
fi

# Export wallet descriptors with private keys
echo "3. Exporting wallet descriptors with private keys..."
cat >> "${BACKUP_FILE}" << EOF
## Wallet Descriptors (with private keys)
# Wallet name: ${WALLET_NAME}
# Command: bitcoin-cli -datadir=${DATADIR} listdescriptors true

EOF

# Get descriptors with private keys (true parameter includes private keys)
DESCRIPTORS=$(sudo docker exec ${CONTAINER_NAME} bitcoin-cli -datadir=${DATADIR} listdescriptors true 2>/dev/null || echo "")
if [[ -n "${DESCRIPTORS}" ]]; then
    echo "${DESCRIPTORS}" | jq '.' >> "${BACKUP_FILE}" 2>/dev/null || echo "${DESCRIPTORS}" >> "${BACKUP_FILE}"
    echo "   ✓ Wallet descriptors exported"
else
    echo "   ⚠ Failed to export wallet descriptors"
    cat >> "${BACKUP_FILE}" << EOF
# Failed to export wallet descriptors
# Make sure the wallet is loaded and accessible

EOF
fi

# Export wallet info
echo "4. Exporting wallet information..."
cat >> "${BACKUP_FILE}" << EOF

## Wallet Information
EOF

WALLET_INFO=$(sudo docker exec ${CONTAINER_NAME} bitcoin-cli -datadir=${DATADIR} getwalletinfo 2>/dev/null || echo "")
if [[ -n "${WALLET_INFO}" ]]; then
    echo "${WALLET_INFO}" | jq '.' >> "${BACKUP_FILE}" 2>/dev/null || echo "${WALLET_INFO}" >> "${BACKUP_FILE}"
    echo "   ✓ Wallet info exported"
else
    echo "   ⚠ Failed to export wallet info"
    cat >> "${BACKUP_FILE}" << EOF
# Failed to export wallet info

EOF
fi

# Export network info
echo "5. Exporting network information..."
cat >> "${BACKUP_FILE}" << EOF

## Network Information
EOF

NETWORK_INFO=$(sudo docker exec ${CONTAINER_NAME} bitcoin-cli -datadir=${DATADIR} getnetworkinfo 2>/dev/null || echo "")
if [[ -n "${NETWORK_INFO}" ]]; then
    echo "${NETWORK_INFO}" | jq '.' >> "${BACKUP_FILE}" 2>/dev/null || echo "${NETWORK_INFO}" >> "${BACKUP_FILE}"
    echo "   ✓ Network info exported"
else
    echo "   ⚠ Failed to export network info"
fi

# Export blockchain info
echo "6. Exporting blockchain information..."
cat >> "${BACKUP_FILE}" << EOF

## Blockchain Information
EOF

BLOCKCHAIN_INFO=$(sudo docker exec ${CONTAINER_NAME} bitcoin-cli -datadir=${DATADIR} getblockchaininfo 2>/dev/null || echo "")
if [[ -n "${BLOCKCHAIN_INFO}" ]]; then
    echo "${BLOCKCHAIN_INFO}" | jq '.' >> "${BACKUP_FILE}" 2>/dev/null || echo "${BLOCKCHAIN_INFO}" >> "${BACKUP_FILE}"
    echo "   ✓ Blockchain info exported"
else
    echo "   ⚠ Failed to export blockchain info"
fi

# Add footer
cat >> "${BACKUP_FILE}" << EOF

# ======================================================================
# End of Backup
# ======================================================================
EOF

echo ""
echo "=== Backup completed ==="
echo "Backup file: ${BACKUP_FILE}"
echo "File size: $(du -h "${BACKUP_FILE}" | cut -f1)"
echo ""
echo "⚠ WARNING: This file contains private keys. Keep it secure!"
echo "   Recommended: Encrypt this file before storing or transferring."
echo ""
echo "To encrypt the backup:"
echo "  gpg -c ${BACKUP_FILE}"
echo ""