{
  "manageEntity": {
    "action": "Save",
    "entityId": "156690",
    "entityType": "Track",
    "nonce": "0x42fa1e1f06d0a139f8f1d32f658fdb121998f836b9585dc67e32932c4ffe51a6",
    "signature": "0xe8a9411db4c803a80cea62b220ea3810d3461a8e5512775b523f14fd56fea74773a1ee10977458ccfba2f6c62f321d5aec7d3a05afdb80f75dc5bb2e70d0c6591c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}