{
  "manageEntity": {
    "action": "Save",
    "entityId": "1690591635",
    "entityType": "Track",
    "nonce": "1785859850487805742",
    "signature": "0xe4e836c65ea64c71ae821ed7e007fc75eda66f8f21c8a3079f84bffaa51ab7a31a29b8b30ab65c634254a34a37f5f88a9b9872a9b993e1b910f1cda3efeb36ff1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}