{
  "manageEntity": {
    "action": "Save",
    "entityId": "353499470",
    "entityType": "Track",
    "nonce": "0x2c37cad82b9054cc77294afa5c2f6f6ec923624a206bde78b302e042a05e01c9",
    "signature": "0x9a65f1524c2d02859c618c3e450a80b3d79b66d97d2291a2fec1bd8a8c3ba8ce21056c9fe74a8407b176d0c9b27a6bb10ef2b5c54b39121c60e7c14fbd0ae8891b",
    "signer": "0x4086Dda2D91F77cd46De0859a4de37F888508faA",
    "userId": "568518925"
  }
}