| Package | Description | 
|---|---|
| org.bitcoinj.params | Network parameters encapsulate some of the differences between different Bitcoin networks such as the main
 network, the testnet, regtest mode, unit testing params and so on. | 
| Class and Description | 
|---|
| AbstractBitcoinNetParams Parameters for Bitcoin-like networks. | 
| MainNetParams Parameters for the main production network on which people trade goods and services. | 
| RegTestParams Network parameters for the regression test mode of bitcoind in which all blocks are trivially solvable. | 
| TestNet2Params Parameters for the old version 2 testnet. | 
| TestNet3Params Parameters for the testnet, a separate public instance of Bitcoin that has relaxed rules suitable for development
 and testing of applications and new Bitcoin versions. | 
| UnitTestParams Network parameters used by the bitcoinj unit tests (and potentially your own). | 
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