{
  "manageEntity": {
    "action": "Save",
    "entityId": "290894",
    "entityType": "Track",
    "nonce": "0x639f201ac7661fe8dca8e530580c2f2050eef4a44f2f1315c34c22cd496b30ec",
    "signature": "0xb9e6bcfd7892675325eab261f393b353270dfac5fd52990d6036247d5051d977725dedff8b123740ab8f5bbbd2be265b98baa566baee4c7d88976825fffa60d61b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}