{
  "manageEntity": {
    "action": "Save",
    "entityId": "288624248",
    "entityType": "Track",
    "nonce": "0x99cded22765c6f53ed86e19ae72eea626acf8291eb2aab0faa74b0ffaf4647ae",
    "signature": "0x37b809f7b5a92d192e7cfe9249d82397b747b7f2f6169fa4542819b5539ce00d563792474ae0166666f28099b5f6ae418666fb0ac22070995b5719068713f3dc1c",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}