{
  "manageEntity": {
    "action": "Save",
    "entityId": "51969810",
    "entityType": "Track",
    "nonce": "0xf78f9194006bd285d773f8d1d4fc291d5ee91561387c1258efc5426e81e9c5de",
    "signature": "0x187c4da8c40fd8f07498bae46a36fa679112e05a04d6bbc14326a5fc939fc5dd7b2b04449d54ad63427e0c17cc5c24a99748c6d2c3b80af18d651b4bdcbb77c61b",
    "signer": "0xb556B474676E208be10BDc6F1AAA07ff74f317cA",
    "userId": "678950548"
  }
}