{
  "manageEntity": {
    "action": "Save",
    "entityId": "243055337",
    "entityType": "Track",
    "nonce": "0x4e67c40107c1e45aa5702ca3412e5a58acec64e35ff1d26f118f100e32108396",
    "signature": "0xebf16355edd9caf47c694e6a17e092729ba49677af90d1aa1653dfc39aacfc0701aacac1b26c3526587ef683ef521757f5ddc2f5951d6b2fe75698c3dd66973b1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}