Hycon Java SDK This sdk can create its own address with the private key, and generate a hex string with the signature transaction. How can I use this project ? 1. getPrivateKey You can get a new private key. It's safety and private. You need use private key for get address 2. getAddress You need provide your private key, and this will return address, like "Hxxxx....". 3. signTransaction Parameters include two address, transfer amount, fee and your private key. There are three method for it. You can choose which you want. Result is an array of strings of length 2 ,first is hex String for signed transaction, second is recovery, maybe is 0 or 1. You can use those parameters and result, to send HYC client "/api/v1/tx/" to broadcast transaction. By the way, networkId is 'hycon'.(If you know hycon used to be hard forked) Others If you have any question, you can submit in "issue". Thanks to the help provided by the HYC project and people. If this help you, please give me a star ^.^