{
"manageEntity": {
"action": "Save",
"entityId": "201521400",
"entityType": "Track",
"nonce": "0x7ba1383815d190278c64693d6b9f8d4e799431d6c974e9e4a949b2d3d28a6804",
"signature": "0xafb353cbe781860caf8101f1ff05bba92ead481cace9d010ff76a635ea5736e9460add06ba2bd576603c63c8fb78cb0a58b48ca19336995a6e3c4d8046a0a7581c",
"signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
"userId": "714646433"
}
}