{
  "manageEntity": {
    "action": "Save",
    "entityId": "354980660",
    "entityType": "Track",
    "nonce": "0x7147e25fcccc4e0aff4b86723964f1ef4656c8f73efd4d4a80bda584a1acfeb4",
    "signature": "0xfe64cfa37a4fbbfb61c4fe6ef397d2ab27879ce5603729cc72ce8098f2b89e48695459b935d1f160f22ef2da6fa4418850cb937c2800f1c785acb2201542f6031b",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}