#cmd--ethkey可用命令
// ./target/debug/bloom-cmd ethkey info 17d08f5fe8c77af811caa0c9a187e668ce3b74a99acc3f6d976f075fa8e0be55
// ./target/debug/bloom-cmd ethkey info --brain "this is sparta"
// ./target/debug/bloom-cmd ethkey sign 17d08f5fe8c77af811caa0c9a187e668ce3b74a99acc3f6d976f075fa8e0be55 bd50b7370c3f96733b31744c6c45079e7ae6c8d299613246d28ebcef507ec987
// ./target/debug/bloom-cmd ethkey verify --public 689268c0ff57a20cd299fa60d3fb374862aff565b20b5f1767906a99e6e09f3ff04ca2b2a5cd22f62941db103c0356df1a8ed20ce322cab2483db67685afd124 --signature c1878cf60417151c766a712653d26ef350c8c75393458b7a9be715f053215af63dfd3b02c2ae65a8677917a8efa3172acb71cb90196e42106953ea0363c5aaf200 --message bd50b7370c3f96733b31744c6c45079e7ae6c8d299613246d28ebcef507ec987
// ./target/debug/bloom-cmd ethkey verify --public 689268c0ff57a20cd299fa60d3fb374862aff565b20b5f1767906a99e6e09f3ff04ca2b2a5cd22f62941db103c0356df1a8ed20ce322cab2483db67685afd124 --signature c1878cf60417151c766a712653d26ef350c8c75393458b7a9be715f053215af63dfd3b02c2ae65a8677917a8efa3172acb71cb90196e42106953ea0363c5aaf200 --message bd50b7370c3f96733b31744c6c45079e7ae6c8d299613246d28ebcef507ec986
// ./target/debug/bloom-cmd ethkey verify --address 26d1ec50b4e62c1d1a40d16e7cacc6a6580757d5 --signature c1878cf60417151c766a712653d26ef350c8c75393458b7a9be715f053215af63dfd3b02c2ae65a8677917a8efa3172acb71cb90196e42106953ea0363c5aaf200 --message bd50b7370c3f96733b31744c6c45079e7ae6c8d299613246d28ebcef507ec987