{
  "manageEntity": {
    "action": "Save",
    "entityId": "393489239",
    "entityType": "Track",
    "nonce": "0x431af8d6ef548904a06ac427353a80aa07de8b2204d4a6747de839b863664a09",
    "signature": "0xa8ee018268e4f2e349b64de6af149a0957d36625dc8b8d38195acc071db4780a068f2b1c960f5df9fbd8ecf93afa2bc4a73232d7bf8b1cb1903d1ae2617533d41b",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}