{
  "manageEntity": {
    "action": "Save",
    "entityId": "465201228",
    "entityType": "Track",
    "nonce": "0xbdc370efb468cf9f5cc42ee9eeeb867e88cdda3a113e0dcf43ba90d3850b3916",
    "signature": "0xb52a863e36519674d4082f1e2f9836e4c1ebd01e6a6586d40a23fa7ba6030b58570b45252af6b73fe89af570708d5ed34671f457f74d68eb9704cd28596f8a221b",
    "signer": "0x39BbEb25924EFA2144235AA6b9287C30dA0bEF8D",
    "userId": "320790987"
  }
}