{
  "manageEntity": {
    "action": "Save",
    "entityId": "523408941",
    "entityType": "Track",
    "nonce": "0x7b6aac1f183b33c6f0d5822315320bfe72db8278242f14432c40c0922531fb97",
    "signature": "0xefe9a47a640f94c0e56025b3533c72cdecc4c52022193b7ecb60cfc3b62880770e836e0efbc7b1f807f18a83dfd0dd1dd5124ac5c4889bb65b5b82b0a0e4fde31c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}