{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "600239",
    "entityType": "User",
    "nonce": "0xda705985471613f498fc956413e17ff3fd7e0109be97586675cde1a637b6ac11",
    "signature": "0xa9a602272b5eb72cfa54e87e6faaf10f2d5970b5181f23f488d0e9dc34a0b75444a73d9a4465a9cee80ebcdf9adbeff16278743bbee2e9c2f07a73f66ac919de1b",
    "signer": "0xFA54BdDbc2fd0fA514bA36393EF2F5a80Ee9C49b",
    "userId": "428192787"
  }
}