{
  "manageEntity": {
    "action": "Save",
    "entityId": "1489912050",
    "entityType": "Track",
    "nonce": "1792376362568274130",
    "signature": "0xb52ec7898a1c785a48b47d37112f5a41023d7a56737fb8b09a99e3fae97dea5414e4342b4a63a76604a9cab146970560f487f32d12b72756aa57b62cf1f39d741b",
    "signer": "0xE9e5656ce6F7Fe41FDbCA982901407eB55765cD3",
    "userId": "670307808"
  }
}