{
  "manageEntity": {
    "action": "Save",
    "entityId": "307430",
    "entityType": "Track",
    "nonce": "0xb2a959c1355550b2003d36f1d49a0dfe820a0b1bba2cdac99ee7a7f0ca7d7eef",
    "signature": "0xc5e1b5644b5c48afb7cfc9fbd49fa6bbcf768422052fa1f993869f557b9b802530f2a073da8c058c35a57546bd89236ccb41f0ca051f830c13cac0c9cc7afdb21b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}