{
  "manageEntity": {
    "action": "Save",
    "entityId": "389420329",
    "entityType": "Track",
    "nonce": "1785396119287773464",
    "signature": "0x8939d327110395395369db31a83c3df23a36b0bf3283456291a075cdc042d70758200821b406d27e692e463a4e0a7468c505005c67abec6afa305bc4fad1c0bd1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}