{
  "manageEntity": {
    "action": "Save",
    "entityId": "972938904",
    "entityType": "Track",
    "nonce": "0x1186e67671edf7994a5453f326b13e743c4aa3f8c69f73c9dc937b2c3bf69f79",
    "signature": "0xb1712133c1563c84585c16bc92a69c0b5c03858d633f96e69b75702308480d334d630e5af4202209223ba3661236433a348a902d08b567b4d32220583206fce81b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}