{
  "manageEntity": {
    "action": "Save",
    "entityId": "289433",
    "entityType": "Track",
    "nonce": "0x1020207c8e128e6327d5d2466cda087013a8f188a801d64be7204b78ca68d448",
    "signature": "0x5bb05f13113f337a746f59171008aba0d6d23d61f5071cf21f0eaec060ae459679c608979c8a7c152700fd0971c3539d79b3d64620c6641e3871b5f36fef7f041c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}