{
  "manageEntity": {
    "action": "Save",
    "entityId": "133523412",
    "entityType": "Track",
    "nonce": "0x651513f52964b9fb19bf11a5acfb6879fc87be2ee48bb9130c1384b515956dd7",
    "signature": "0xde1216b5322253de1f47d4c5f2e3d179efbbc521c800f9fee209382444afe5466ebfdc3b179681b49cd001d1c718a2a4b2786d39d8a8adc23431ca794557aa221b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}