{
  "manageEntity": {
    "action": "Save",
    "entityId": "768356989",
    "entityType": "Track",
    "nonce": "0x8b6514de408d0716d5ce5ea5d57906098e9562d524ab5f1471896842ada2b410",
    "signature": "0x3a963e36c4305484c408926508f6cecd54d9629adc5e325683edfc03308e3925167610eaab3e551aafb12f074e28e53e9f645406e3140dfd98a845ca2e2ca1531c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}