{
  "manageEntity": {
    "action": "Save",
    "entityId": "2142954594",
    "entityType": "Track",
    "nonce": "1790020860846051639",
    "signature": "0x94a116d51f358977e8762e74f77b604ee1c8246003aef79c141348e26e9472961727216bdad2556a101b2ae674204be3b08d5685a98ae4a8e0669e74d9346b321b",
    "signer": "0xE9e5656ce6F7Fe41FDbCA982901407eB55765cD3",
    "userId": "670307808"
  }
}