{
  "manageEntity": {
    "action": "Save",
    "entityId": "144013374",
    "entityType": "Track",
    "nonce": "0x6406e8ef9d81c1434334c00bc84ca75ade1377e9fe66e5ff4f892d89139f33c6",
    "signature": "0x63ff84a00c59726c6f42d4933417fdf5d5a29ac2cb0c79258be74795ec88779a4b3fd64a76beb48ad07a5ba0c40b24b0099738859ef1ccfec11d2c564a771c341b",
    "signer": "0xAAB9cff3D43A1b095421916d4C7D864d657286c7",
    "userId": "435031315"
  }
}