{
  "manageEntity": {
    "action": "Save",
    "entityId": "490107281",
    "entityType": "Track",
    "nonce": "0xc564492db8f2878c1349674a64f85ae834e34a7c87e80a6218f1654e375895ad",
    "signature": "0x5bbf7cabfdab4fa401c93a6a99557a6b4a8e93defeb727d98918f4d896bef92a6d1335947c3f664c105f229e95bf808f70f735a617f845ac7408c2f9367bd4221c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}