{
  "manageEntity": {
    "action": "Save",
    "entityId": "129977",
    "entityType": "Track",
    "nonce": "0xbcacab8fb8d616f351d46c7b9ae04efd9f591bce0ea03b28dbd4215aab070b0e",
    "signature": "0xb98010e8739e0f371f9f2b94b357df0eb8f64977c7086474ddfbd514d7d809231c112115717da7538a5716ad1de4ba06b75543b819c8a270946f0bd4279706b81c",
    "signer": "0xF7C299AB5282FD59254Ec0098FC5F1B997682c83",
    "userId": "61898"
  }
}