{
  "manageEntity": {
    "action": "Save",
    "entityId": "1245307924",
    "entityType": "Track",
    "nonce": "0x715c17e4360193dbf4c47cf360980813e850666b7e3e1abbb352a838a7cef1ec",
    "signature": "0xff435b94d5d418713f2864053de9523bd2b7807cba65ef6d53cf596ee576bb092e25bbaad01bad412c61d2ed9854681e5a16c795b2abaa745cb47ea4e447a2881c",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}