eth_getWork，返回当前块的hash，seedHash和要找到的边界条件（“目标”）。
参数：
- none
返回：
Array - 具有以下属性的数组：
- DATA, 32 Bytes - 当前块标题pow-hash
- DATA, 32 Bytes - 用于DAG的seed散列。
- DATA, 32 Bytes - 边界条件（“目标”）, 2^256 / difficulty.
例子
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getWork","params":[],"id":73}'
// Result
{
"id":1,
"jsonrpc":"2.0",
"result": [
"0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
"0x5EED00000000000000000000000000005EED0000000000000000000000000000",
"0xd1ff1c01710000000000000000000000d1ff1c01710000000000000000000000"
]
}
