{
  "manageEntity": {
    "action": "Save",
    "entityId": "699091460",
    "entityType": "Track",
    "nonce": "0xc0c34978e1b708493c679c5ea3fd26a3c70f9dc189eee22e9e542a32d849ceba",
    "signature": "0xa2a112ec689fb458fdb8abade2e5be9349e7df3126c24e01401b9972dc9d69405d4e739506dfaa388f9eaa016e757e5bedbe77fb64ef2a9a77fde304367afa281c",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}