{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "542041690",
    "entityType": "User",
    "nonce": "0x50643c98f2c46c8428b9cf18316e3dd31580314d1f0d085ee7faf51ff4695f15",
    "signature": "0x1b6140d47a7812ba1354861029ef8428b7ba5b3000c7f225625f36cb7f3de1760de1d74e8f41a3733455343495dc58c14852c3122cd465652d88e7edfa40c2d81c",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}