{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "538529159",
    "entityType": "User",
    "nonce": "0x221973b8d23baf5832dbac0ecb86b7076b1bde3b70016873b2d8db3c7fe2a896",
    "signature": "0xde38bb37c4d9704fa1a4d170254f70a718405c20c3d3b08af2ab0f291a269eb066a16f3635651844b0d572c66a2c961d7f6a01732da941a1127a4aafbc5a11431c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}