| 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.crypto | The crypto package contains classes that work with key derivation algorithms like scrypt (passwords to AES keys),
 BIP 32 hierarchies (chains of keys from a root seed), X.509 utilities for the payment protocol and other general
 cryptography tasks. | 
| org.bitcoinj.protocols.channels | Micropayment channels allow for rapid tiny payments to be made to a third party once a channel has been set up, using
 some of the advanced features of the Bitcoin protocol. | 
| org.bitcoinj.protocols.payments | The BIP70 payment protocol wraps Bitcoin transactions and adds various useful features like memos, refund addresses
 and authentication. | 
| org.bitcoinj.script | Classes for working with and executing Bitcoin script programs, as embedded in inputs and outputs. | 
| org.bitcoinj.signers | Transaction signers know how to calculate signatures over transactions in different contexts, for example, using
 local private keys or fetching them from remote servers. | 
| org.bitcoinj.testing | Various utilities for writing unit tests: also useful for testing your own code and apps that build on top of
 bitcoinj. | 
| 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. | 
| Class and Description | 
|---|
| ChildNumber This is just a wrapper for the i (child number) as per BIP 32 with a boolean getter for the most significant bit
 and a getter for the actual 0-based child number. | 
| DeterministicKey A deterministic key is a node in a  DeterministicHierarchy. | 
| EncryptableItem Provides a uniform way to access something that can be optionally encrypted with a
  KeyCrypter, yielding anEncryptedData, and
 which can have a creation time associated with it. | 
| EncryptedData An instance of EncryptedData is a holder for an initialization vector and encrypted bytes. | 
| KeyCrypter A KeyCrypter can be used to encrypt and decrypt a message. | 
| KeyCrypterException Exception to provide the following: | 
| LazyECPoint A wrapper around ECPoint that delays decoding of the point for as long as possible. | 
| TransactionSignature A TransactionSignature wraps an  ECKey.ECDSASignatureand adds methods for handling
 the additional SIGHASH mode byte that is used. | 
| Class and Description | 
|---|
| BIP38PrivateKey.BadPassphraseException | 
| ChildNumber This is just a wrapper for the i (child number) as per BIP 32 with a boolean getter for the most significant bit
 and a getter for the actual 0-based child number. | 
| DeterministicKey A deterministic key is a node in a  DeterministicHierarchy. | 
| EncryptableItem Provides a uniform way to access something that can be optionally encrypted with a
  KeyCrypter, yielding anEncryptedData, and
 which can have a creation time associated with it. | 
| EncryptedData An instance of EncryptedData is a holder for an initialization vector and encrypted bytes. | 
| HDDerivationException | 
| HDKeyDerivation.PublicDeriveMode | 
| HDKeyDerivation.RawKeyBytes | 
| KeyCrypter A KeyCrypter can be used to encrypt and decrypt a message. | 
| KeyCrypterException Exception to provide the following: | 
| LazyECPoint A wrapper around ECPoint that delays decoding of the point for as long as possible. | 
| MnemonicCode A MnemonicCode object may be used to convert between binary seed values and
 lists of words per the BIP 39
 specification | 
| MnemonicException Exceptions thrown by the MnemonicCode module. | 
| MnemonicException.MnemonicChecksumException Thrown when a list of MnemonicCode words fails the checksum check. | 
| MnemonicException.MnemonicLengthException Thrown when an argument to MnemonicCode is the wrong length. | 
| MnemonicException.MnemonicWordException Thrown when a word is encountered which is not in the MnemonicCode's word list. | 
| TransactionSignature A TransactionSignature wraps an  ECKey.ECDSASignatureand adds methods for handling
 the additional SIGHASH mode byte that is used. | 
| TrustStoreLoader An implementation of TrustStoreLoader handles fetching a KeyStore from the operating system, a file, etc. | 
| Class and Description | 
|---|
| TransactionSignature A TransactionSignature wraps an  ECKey.ECDSASignatureand adds methods for handling
 the additional SIGHASH mode byte that is used. | 
| Class and Description | 
|---|
| TrustStoreLoader An implementation of TrustStoreLoader handles fetching a KeyStore from the operating system, a file, etc. | 
| Class and Description | 
|---|
| TransactionSignature A TransactionSignature wraps an  ECKey.ECDSASignatureand adds methods for handling
 the additional SIGHASH mode byte that is used. | 
| Class and Description | 
|---|
| ChildNumber This is just a wrapper for the i (child number) as per BIP 32 with a boolean getter for the most significant bit
 and a getter for the actual 0-based child number. | 
| Class and Description | 
|---|
| ChildNumber This is just a wrapper for the i (child number) as per BIP 32 with a boolean getter for the most significant bit
 and a getter for the actual 0-based child number. | 
| Class and Description | 
|---|
| ChildNumber This is just a wrapper for the i (child number) as per BIP 32 with a boolean getter for the most significant bit
 and a getter for the actual 0-based child number. | 
| DeterministicKey A deterministic key is a node in a  DeterministicHierarchy. | 
| EncryptableItem Provides a uniform way to access something that can be optionally encrypted with a
  KeyCrypter, yielding anEncryptedData, and
 which can have a creation time associated with it. | 
| EncryptedData An instance of EncryptedData is a holder for an initialization vector and encrypted bytes. | 
| KeyCrypter A KeyCrypter can be used to encrypt and decrypt a message. | 
| MnemonicException Exceptions thrown by the MnemonicCode module. | 
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