{
  "manageEntity": {
    "action": "Save",
    "entityId": "881974540",
    "entityType": "Track",
    "nonce": "0x581d619abb4366de8b9d751d80579a75ba1870a8204f790dc62839fc24c95fe9",
    "signature": "0x3e291408740e58e83e40640485610fffab8e348674e3f0adba1f681513533a0f1aadc4cb6f0044fec90762c274e54cfec7cf1fd68193e978c8e78230ed1479c01b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}