{
  "manageEntity": {
    "action": "Save",
    "entityId": "523569",
    "entityType": "Track",
    "nonce": "0x952285c87fbff31b72e25d41679b3d973b5b0c52fa2757c707f0e64e1e9ebf8d",
    "signature": "0x95793680000547f3a6b056564b07c4c5874715adee229d7c3ba63eea4147e41d5ab2365917bf91996e711ae2c6f4c59e193ed460803bc98579fbd47ee3f4c0db1c",
    "signer": "0x1Ffe2D421cF901dE6a191F85092964B85B3Ce4d0",
    "userId": "452108975"
  }
}