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CID将其他CID信息加密后写在链上，构成自己的通讯簿。
https://shimo.im/docs/rIfaFGHTAosSLZLB/ 《FEIP12V1_链上通讯簿》
@昌用 示例中，加密上链的CID和标签写成明文了。改一下吧。
@水雷_zzHe 好，忽略了这个问题。这样的话，就不能同时定义多个cid的好友了，只能用一个cid的公钥加密。并且，cid和标签要放在一起加密，否则220字节不够了。