{
  "manageEntity": {
    "action": "Save",
    "entityId": "545399",
    "entityType": "Track",
    "nonce": "0x207c488ff1d1592733b1f2c06f8678abe530bcc51915e80d6b416bb2a7891be8",
    "signature": "0xe9ce51e448d16d4cec7ec5549a243e88cb2e3fbfe1e16480dda43d3340cf57db1ef333ab139a06ca87fc599173b37d43346a3f864b12f45c469a963185c93cdb1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}