{
  "manageEntity": {
    "action": "Save",
    "entityId": "664724",
    "entityType": "Track",
    "nonce": "0x1145608939934f975fc28e12469b705235b192628f002acc2b80fe2c72b9f7b4",
    "signature": "0xf9489c383ef5dd22751e13987a9870ad4e7c2801b1c3645626659398fdb579a87ed62542805b5e3b1982939fe539a6aebc0b3dfb4707a51eb9e0be90d2913e7f1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}