{
  "manageEntity": {
    "action": "Save",
    "entityId": "1487068224",
    "entityType": "Track",
    "nonce": "0xb21e2fe9b63deec99e545c00147095d83539cdc3b2390d5ef6e40cd0573e4718",
    "signature": "0x00884a063aa66be8b8e37f7697373294fd681fc8763799763a143e89fc3e001f7d8bac1f56df0569e15b23a460af44ba6939e92a87f4f7adb84f4c3b5344b8831c",
    "signer": "0x4b8C8Bf7753B25e756D56124590F13eE023632B2",
    "userId": "138349429"
  }
}