{
  "manageEntity": {
    "action": "Save",
    "entityId": "384894",
    "entityType": "Track",
    "nonce": "0x562d7ca71f4ae9988332b6a44ac8ffa5899f8c91768d11bff4517c8b85776354",
    "signature": "0x181e0b5a371ecf3a13dca00cfe32a341f6bd45536568fa1919f0c67526605e242324546ce855ba12f47d279e61c1556de8a1d4f68ff4847e69efeb69af79e4ff1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}