{
  "manageEntity": {
    "action": "Save",
    "entityId": "750405916",
    "entityType": "Track",
    "nonce": "0x40ec59c6b92728b8413e9b2c02d5032ad1c328618abf559050efe2f0a47db1fc",
    "signature": "0x0094fcbc1d3f6df436eae25055b292833113f9d84c94a342a0f2f995150427be38439fcff3bf109c00345ee528081b8ed2870cad83825d30644129f2671a74511b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}