{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "190321",
    "entityType": "User",
    "nonce": "0x9893fafbf58aac99489d03b7a796d8c9b08c2a267bb76969ac44a88dace7c82d",
    "signature": "0x74cda20f7f51fa292af22a169cd7cbe8986d09863287ca89893c8bc782cbdd3e31d6d2684c0b14b20f15a64072e30722710809017e1f9d254faf370214e191501b",
    "signer": "0xa603e9487Ed7C3C62E8acb85f8f32acFf5d6349b",
    "userId": "278135553"
  }
}