{
  "manageEntity": {
    "action": "Save",
    "entityId": "758689129",
    "entityType": "Track",
    "nonce": "0x35e792aa3bcad60bfb3a81eee7c38899a44cb6328000a832901143304e7faed3",
    "signature": "0xde36faaa8aebf4eb46f4a3415a32ef2817df11323c3c718ccf8643011531932f01deb6065f8100938fcf28f5520eb1a1adc1286329f848a2414dbfc97988be3e1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}