{
  "manageEntity": {
    "action": "Save",
    "entityId": "337782369",
    "entityType": "Track",
    "nonce": "0x6b869a6c3fc6f88f5e53b3bbe3f031aaeaf6160577147fefab0ce933b766cc72",
    "signature": "0x330f48ef577e0f3122ae6ab90c650573db31b1e68ff54c46f805ac02a3f1a4255312538508238a42d63f004a1311a9278171dad99e93c6224fa83a931622beb01b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}