| Package | Description | 
|---|---|
| org.bitcoinj.core | The core package contains classes for network messages like  BlockandTransaction, peer connectivity viaPeerGroup,
 block chain management and theWalletclass. | 
| org.bitcoinj.wallet | Classes that support the  Wallet, which knows how to find and save transactions relevant to
 a set of keys or scripts, calculate balances, and spend money: the wallet has many features and can be extended
 in various ways, please refer to the website for documentation on how to use it. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | Wallet. upgradeToDeterministic(org.spongycastle.crypto.params.KeyParameter aesKey)Upgrades the wallet to be deterministic (BIP32). | 
| Modifier and Type | Method and Description | 
|---|---|
| DeterministicKeyChain | KeyChainGroup. upgradeToDeterministic(long keyRotationTimeSecs,
                      org.spongycastle.crypto.params.KeyParameter aesKey)If the key chain contains only random keys and no deterministic key chains, this method will create a chain
 based on the oldest non-rotating private key (i.e. | 
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