option to autoReveal bets by external parrty

[szerintedmi]

Users should have the option to ask for auto reveal their bets.
Should be set by default. Disable should be a non-emphasized option on UI for security conscious users who don't want to trust a 3rd party

How

1. Encrypt bet + random salt on client side with Oraclize public key (using their API)
2. Schedule a reveal callback with Oraclize in LupiManager to the bettingPeriodEnds time
3. On __callback call Lupi.revealBetForAddress

Notes

• Only will work with Oraclize when there is no ticketCountLimit set
• how to handle costs? ie. callback cost is paid from contract balance

[szerintedmi]

szerintedmi @szerintedmi 12:39
we store the bid encrypted with user’s secret key. at reveal user sends unencrypted bid and their secret key. we verify it against the stored one.

Marco Giglio @marcogiglio 12:39
ok I understood, I was thinking of something else. That's a bit inefficient.. you could store all the encrypted bids in a string, using strconcat and then make only one oraclize_query and receive only one callback with everything decrypted
you can used the nested datasource for that
and have many decrypt ds query nested inside

Marco Giglio @marcogiglio 12:46
and offcourse, that oraclize_query would be at the end of the bidding process
the only drawback would be that the last bidders will pay a bit more gas because of the cost of executing the function oraclize_query

Marco Giglio @marcogiglio 12:51
oraclize_query("nested", "[URL] ['json(https://api.random.org/json-rpc/1/invoke).result.random.data.0', '\\n{\"jsonrpc\":\"2.0\",\"method\":\"generateSignedIntegers\",\"params\":{\"apiKey\":${[decrypt] BIm/tGMbfbvgqpywDDC201Jxob7/6+sSkRBtfCXN94GO0C7uD4eQ+aF+9xNJOigntWu8QHXU6XovJqRMEGHhnEnoaVqVWSqH1U1UFyE6WySavcbOb/h8hOfXv+jYBRuhkQr+tHXYrt1wx0P0dRdeCxbLp1nDuq8=},\"n\":1,\"min\":1,\"max\":10000${[identity] \"}\"},\"id\":1${[identity] \"}\"}']", ORACLIZE_GAS_LIMIT + safeGas);
https://gist.github.com/marcogiglio/72beccc1a48ef944e8c8b8f8aa9b8cd0

an example of nested and decrypt usage