{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "121717",
    "entityType": "User",
    "nonce": "0x400f21bbafdc61a716aa63e878459e0ec56f948adee3441d53e77f2795d8d67d",
    "signature": "0xf9658f74b086e88b3b3ca23ff035eaa99f65a92081c4004b25bdbef486d4715b20033536b878b164830b9ea41974b3e05eb7d81b609b664d5b3e61650cd1fad61c",
    "signer": "0x15F044DF87A440bA5eEeC6D18C219f99Fe2A80b3",
    "userId": "909119422"
  }
}