{
  "manageEntity": {
    "action": "Save",
    "entityId": "538037690",
    "entityType": "Track",
    "nonce": "0xc8d8e3a52d8ae6b9ae3b6e095666beac8760cab35652d8d1d14a56e58d02b94a",
    "signature": "0x445984bccc986a7e5fc38e8eae1ea3093e7dd5ef21b798869b20559ede3980372d70ab6c62b7d14ae57c922df438243cb0f652fb9a403b3214565027f634e6801c",
    "signer": "0xE6a2533061175ED4c7f073A7BE3dc4189A4DE47E",
    "userId": "427249190"
  }
}