{
  "manageEntity": {
    "action": "Save",
    "entityId": "900545259",
    "entityType": "Track",
    "nonce": "0x2480acf13de8ddc244f42f74bdb4ddc904c74dbc048deefaff4dd140dcdc947a",
    "signature": "0x329e39676a8d219ae088fdba67b9cac36c87118681302b5df83b359316a906f2727ecdde941f25fcd968f57c2be13fa498e4be4b7672f05c8cd7387f4ca173341b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}