{
  "manageEntity": {
    "action": "Save",
    "entityId": "902269646",
    "entityType": "Track",
    "nonce": "0x483b33e35d5bbf178f963e75a965c606960fe194d3e6064c73e1ee4039c6c74e",
    "signature": "0xaff8ecbdfa5a75dcd682f13b0c019e5dc2073bc398ed794e27a579bd143588d0652ece2ec7d6f62494c024624c31832c2e3a0dcc21c9e50de8a9e3d5ee5629d61b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}