{
  "manageEntity": {
    "action": "Save",
    "entityId": "1600023224",
    "entityType": "Track",
    "nonce": "0x702f326241a4b36b7c35f4c01d9e5b36e19224f51afedbd261930f02709c3853",
    "signature": "0x0effe513d6563728eacad705283759621e13b2ac5d56d93ca19a5d3b64e6efeb5bcad3a7ec8a8747395c32f059c513be5ed42fb044db1f729e9d7c10adce117a1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}