{
  "manageEntity": {
    "action": "Save",
    "entityId": "816320992",
    "entityType": "Track",
    "nonce": "1790045726041457890",
    "signature": "0xcfe68ade01af110ae2862d0675371ef376f0a492767240c72543ff985a8ecb55124afea5c142fd22708efb752ca4689e6e6604ce4488e12260b4095bb989b0161c",
    "signer": "0xE9e5656ce6F7Fe41FDbCA982901407eB55765cD3",
    "userId": "670307808"
  }
}