{
  "manageEntity": {
    "action": "Save",
    "entityId": "457575682",
    "entityType": "Track",
    "nonce": "0x8410e76fa94d2f7aed09f49d2995cead645f9c667e9841620abf00992613fbcd",
    "signature": "0x8af5a3d08b62a7dbde044243d4bc5634ab1a6692aae84560e614b264452ee31a06238dbb3e2624f1a4e5d0c6274bc782f7c9604cf67f8f96e80fa91d996a59031b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}