{
  "manageEntity": {
    "action": "Save",
    "entityId": "1307069565",
    "entityType": "Track",
    "nonce": "0xff405e31fe7d396ae3d9270d2ee8c8ee765e290150830374d812529abb5985ca",
    "signature": "0xad6e30dc29047a241147533d2f6d2a230cafefc716cb0302e8e680a84e0ae0311c0ae364cefe21c1f9dd8b7e209ad74fcdc2f85bcd3deab46cacb3a93d4b95711c",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}