implements valid sign()

.gitignore

README.md

...main/java/io/ucoin/client/core/model/BlockchainBlock.java

...in/java/io/ucoin/client/core/service/AbstractService.java

.../java/io/ucoin/client/core/service/BlockchainService.java

.../main/java/io/ucoin/client/core/service/ProtocolUrls.java

...rc/main/java/io/ucoin/client/core/service/WotService.java

.../client/core/technical/crypto/AddressFormatException.java

...in/java/io/ucoin/client/core/technical/crypto/Base58.java

...va/io/ucoin/client/core/technical/crypto/CryptoUtils.java

...java/io/ucoin/client/core/technical/crypto/SecretBox.java

...java/io/ucoin/client/core/technical/crypto/nacl/NaCl.java

...o/ucoin/client/core/technical/crypto/nacl/curve25519.java

...ore/technical/crypto/nacl/curve25519xsalsa20poly1305.java

.../io/ucoin/client/core/technical/crypto/nacl/hsalsa20.java

.../io/ucoin/client/core/technical/crypto/nacl/poly1305.java

...a/io/ucoin/client/core/technical/crypto/nacl/salsa20.java

...io/ucoin/client/core/technical/crypto/nacl/verify_16.java

.../io/ucoin/client/core/technical/crypto/nacl/xsalsa20.java

...n/client/core/technical/crypto/nacl/xsalsa20poly1305.java