{
  "manageEntity": {
    "action": "Save",
    "entityId": "783916562",
    "entityType": "Track",
    "nonce": "0x1f0acd361f521fd4f019d7e0ae2c312b8dd896094dbf063d52502a66b7cbe9cb",
    "signature": "0xa2c5570e197812098fee6853733372e3d8247fe20e26837554cb4487a42aa3277c83588ce8d42233f0a78a729f9571727852e52fa22d280be150ca72cfaaf10e1c",
    "signer": "0x75387BeED3d3B040a54C3e303fF0B07Da67a9186",
    "userId": "223536026"
  }
}