{
  "manageEntity": {
    "action": "Save",
    "entityId": "769725469",
    "entityType": "Track",
    "nonce": "0xe0a33b15fa9eab32bdba294f5c67671152481a8e4764e161fe23cca3c3405a59",
    "signature": "0xe8b8f143bc910f560c9c851302bd58d4854089d685b1f73aaf7d63e294a969d77c561019bb4c980b08b66f796d59297ffa9dbb0a2e5b067f93d253942dfae87c1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}