{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "421",
    "entityType": "User",
    "nonce": "0x4357e1107d656cb2b044737dbb1ed958699c9b31e086f4da8c824263b4be8657",
    "signature": "0x53948c69ff34d3cbcf7b2c9853f93715f508455773c98cefc22988e30286461d173de997ac2a256ca8f1e04af8bc0b0ae77102adfe35d96a33b801455656d5881b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}