{
  "manageEntity": {
    "action": "Save",
    "entityId": "1516121046",
    "entityType": "Track",
    "nonce": "0x305b8939b48e8b0030a8e8f627a958e23c87b910dc570de1fcd36c78b3163fb0",
    "signature": "0x8c7f0eef5432b4cbcae875796ef1598130ed4627ebade58f80dc3522232656af0cc5b9574082935704f0444e4d3806d317ad91901a335e36302ef3f4522016a41b",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}