{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "190321",
    "entityType": "User",
    "nonce": "0x0408ca87e476082b4c2bb9cac197005ae99560342d66e03e412e99231ed90b05",
    "signature": "0x0f9e7f9dcbdf6f54e6751cb184cf35a74336f8f0abd189958219dd963052bef65f89e3634f3e5ed75d656cb10c7a3694a82f85e6fb123c525c73c8134a6e18f81c",
    "signer": "0xa603e9487Ed7C3C62E8acb85f8f32acFf5d6349b",
    "userId": "278135553"
  }
}