{
  "manageEntity": {
    "action": "Save",
    "entityId": "786438745",
    "entityType": "Track",
    "nonce": "0x3918f2859f9dc982f5df4b5f5640e218c9f1158da75a5b02d07efde06c2f016e",
    "signature": "0x03e6082685fbec5b17521d590377eec3978df5efaf7d8d931ca01dfebdd2ae376894e5236c3baedea4f9defecdab5d52c9cca96e4582a72d9cb955065fc04b271b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}