{
  "manageEntity": {
    "action": "Save",
    "entityId": "544193",
    "entityType": "Track",
    "nonce": "0x526819c14c8bb321755e1f3c9ce46f2182dad9b737adf92edd49329a069948ca",
    "signature": "0x4b7ba3d94544f282f40fee3da5492e1f643958acb74fca5d90385ec07efaa68174ba346c70e8a6113eb8603378b51886168c76022d1e85d3c00eb9d398db23e31c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}