{
  "manageEntity": {
    "action": "Save",
    "entityId": "554499046",
    "entityType": "Track",
    "nonce": "0x401cdfcbf064e97908a6b5616b60f98da526c2b45de5a861d71b21e510e8c7e7",
    "signature": "0x53ae45ca4d1c1c53a3c65fa0543af730f646987d33f41f372dbf30b3ab95d57935aa4100fc06bb8bdc8c7f91c8235a9b9c432e44f00ce9368fb147c2cc1476971c",
    "signer": "0xbbB98413eB671bb0000F0b18A2A7Cae9631043E1",
    "userId": "98311147"
  }
}