{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "307",
    "entityType": "User",
    "nonce": "0xdeea5742e1678da5e3431d119534808640a5c50334fdc640c2d7ea23fc6e6164",
    "signature": "0xddedcba33bb16d4153be854ab4008e5e84769f383fc2b4a509006a0e25eb9bd07006ecc89c5d686b2a3232ff85f820d6d7b82696fcbad5fe22a37061cf2c1ba11c",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}