{
  "manageEntity": {
    "action": "Save",
    "entityId": "238764",
    "entityType": "Track",
    "nonce": "0x3934a72a2f6a5e27d4007e7695c2d6add1f65db0574b936984bbb876f2b61e6e",
    "signature": "0x48a53bbf99dc416f800b43eefea3674dc564a372c9c5c9a0dc4004140963987868a8c76b18827a2b359dfea602b81b233b4708a083a0d1634c306d3b404be0161b",
    "signer": "0x3D4d8a781454E2338c482dE697d6DE1ACc7D9031",
    "userId": "599751364"
  }
}