{
  "manageEntity": {
    "action": "Save",
    "entityId": "1991851531",
    "entityType": "Track",
    "nonce": "0xb8fc655c7600ce479ce8b72a73d9b57cb535395d52b2454f4fcd897a08c181dd",
    "signature": "0x18d3487a6ff80a43022da758592c65caae7cd1629b37f604fa984f03b7b87a35288767115ccd3d619f62645e04240b81040de3dbcb740742ba322dbf6c4eb3c51c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}