{
  "manageEntity": {
    "action": "Save",
    "entityId": "432526049",
    "entityType": "Track",
    "nonce": "0x54141ef1d0607b4628d5da20cf50f2cb2a79d06320167e6a09556abcbbe2fa93",
    "signature": "0xb3d6aea3987f6b13f41476052f745b750a1b402f3f27bb77033cffc86236ca8d466db4edf0184d38c1157b772c869224be12256dd19a1a19b1a22e5714938b381c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}