Bitcoin recover keys

Bitcoin Wallet (Android)

Good old "Bitcoin Wallet" is not syncing with servers anymore. So you will not be able to broadcast TX from that app.

Link to Google Play app

Luckily the app is open source and they have provided hints to uncover the keys from backup file.

Just adding my experience on top of it..

Decrypt backup

# will prompt for backup password
openssl enc -d -aes-256-cbc -md md5 -a -in bitcoin-wallet-backup-testnet-2014-11-01 > bitcoin-wallet-decrypted-backup

cat bitcoin-wallet-decrypted-backup | tr -cd "[:print:]" | awk '{print $1}'

If it prints "org.bitcoin.production", you got the right password and the backup file uses the bitcoinj protobuf format

Open the wallet with bitcoinj and extract key

After cloning git clone -b release-0.15 https://github.com/bitcoinj/bitcoinj.git

I also installed Java 11, cause the build would not work

sudo apt install openjdk-11-jdk

export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64

Then the wallet builds

cd bitcoinj/tools
./wallet-tool

Reset and sync

./wallet-tool reset --wallet=/home/atle/bitcoin/decrypted-backup

Dump priv keys

./wallet-tool dump --wallet=/home/atle/bitcoin/decrypted-backup --password={pincode}