| Package | Description | 
|---|---|
| org.bitcoinj.core | The core package contains classes for network messages like  BlockandTransaction, peer connectivity viaPeerGroup,
 and block chain management. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | GetAddrMessageRepresents the "getaddr" P2P protocol message, which requests network  AddressMessages from a peer. | 
| class  | UnknownMessageInstances of this class are not safe for use by multiple threads. | 
| class  | VersionAckThe verack message, sent by a client accepting the version message they
 received from their peer. | 
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