Easy as 1, 2, 3
Blobbers must provide three things when issued a challenge by miners:
1) the data being stored
2) the relevant system metadata
3) the client-signed marker to prove that the correct data is being stored
简单到1，2，3
当矿工发出挑战时，Blobbers必须提供三件事：
1） 正在存储的数据
2） 相关系统元数据
3） 客户端签署标记以证明存储了正确的数据