[{"data":1,"prerenderedAt":544},["ShallowReactive",2],{"project-2973301":3},{"id":4,"name":5,"line":6,"line_source":7,"title":8,"url":9,"domain":10,"maker":11,"posted_at":12,"year":13,"points":14,"comments":15,"rank_in_year":16,"shown_in_year":17,"top":18,"tier":19,"category":20,"subcategory":21,"format":22,"keywords":23,"reception":28,"sentiment":29,"stance_mix":30,"scored_comments":35,"aspects":36,"strip":47,"post_text":49,"what":50,"said":112,"maker_in_thread":283,"shape":294,"grid":297,"attempts":507,"same_week":508,"maker_shows":38,"maker_hidden":536,"reader_version":537,"card":538},"2973301","Bitcoinica","Advanced Bitcoin Trading Platform","title","Show HN: Bitcoinica - Advanced Bitcoin Trading Platform","https:\u002F\u002Fwww.bitcoinica.com","bitcoinica.com","zhoutong",1315477646,2011,129,93,75,1097,7,"notable","finance_crypto","bitcoin trading platform","web_app",[24,25,26,27],"bitcoin trading","margin trading","bitcoin exchange","forex bitcoin","mixed",-0.217,{"positive":31,"neutral":32,"mixed":33,"critical":34},6,16,4,21,47,{"design":37,"idea":40,"execution":42,"docs":44,"pricing":46},{"positive":38,"critical":39},3,0,{"positive":39,"critical":41},10,{"positive":39,"critical":43},9,{"positive":45,"critical":39},1,{"positive":39,"critical":45},[38,39,39,48,38,45,38,45,38,38,45,45,38,38,38,45,45,45,45,45,39,39,38,45,38,45,39,39,45,45,45,45,48,48,48,38,48,38,39,45],5,null,{"problem":51,"audience":61,"pricing":69,"motivation":49,"time_to_build":75,"stack":81,"openness":109,"stage":110,"team_size":111},{"value":52,"source":53,"evidence":54},"Lets users trade bitcoin on margin, with positions accounted in USD","maker",[55,58],{"id":56,"by":11,"text":57},"2973384","The problem lies on margin accounts. If you use any Forex brokerage platform to trade Euro, for example, you won't get the actual Euro anyway. What you get is still US Dollars…",{"id":59,"by":11,"text":60},"2973494","Yeah, I understand your concern. Bitcoinica has several features\u002Fcharacteristics that make itself like no other: - There's no Bitcoin wallet. Most incidents happen with stolen or…",{"value":62,"source":63,"evidence":64},"Bitcoin traders, including those with no trading experience","commenter",[65],{"id":66,"by":67,"text":68},"2973787","rb2k_","That's a great site and will help people that haven't got any trading experience to 'play' a little bit without having to do all sorts of things in the 'real' money market A…",{"value":70,"source":53,"evidence":71},"Margin trading with spreads of about 0.5% to 2% per side; margin fees not explained on site",[72],{"id":73,"by":11,"text":74},"2973563","If you compare to Forex brokerages, yes. But consider the volatility of BTCUSD, you can make profits despite the high spreads. Usually BTCUSD can fluctuate 5% - 20% everyday, and…",{"value":76,"source":53,"evidence":77},"About one week of work, per the maker",[78],{"id":79,"by":11,"text":80},"2973697","I only started working a week ago. I'm currently in school holiday, so I can afford long hours. And since this is a solo project, I have no communication problems. I can just do…",[82,89,93,97,103],{"value":83,"source":53,"evidence":84},"Ruby on Rails",[85,86],{"id":59,"by":11,"text":60},{"id":87,"by":11,"text":88},"2976611","Devise has too many features that I don't really need. I followed Ryan Bates's advice - use nifty:authentication generator.",{"value":90,"source":53,"evidence":91},"Twitter Bootstrap",[92],{"id":79,"by":11,"text":80},{"value":94,"source":53,"evidence":95},"Heroku hosting",[96],{"id":59,"by":11,"text":60},{"value":98,"source":53,"evidence":99},"ActiveRecord",[100],{"id":101,"by":11,"text":102},"2973732","Currently our only non-trivial security challenges are as follows: - SQL Injection - Source being viewed - Financial attacks I believe that Rails has no problems with SQL…",{"value":104,"source":53,"evidence":105},"BCrypt password hashing",[106],{"id":107,"by":11,"text":108},"2976499","I have already been using salted BCrypt since day one. I know how important security is.","unknown","beta","solo",{"praise":113,"objections":140,"requests":192,"questions":229,"alternatives":250},[114,129,136],{"value":115,"source":63,"evidence":116},"Site looks slick and well designed",[117,121,125],{"id":118,"by":119,"text":120},"2973429","JoachimSchipper","This seems far more advanced than usual for Bitcoin. Nice! I have little insight into the security of your software, but I hope you have also considered the peculiarities of…",{"id":122,"by":123,"text":124},"2973815","steve8918","Very very cool! The idea is great and the interface looks slick! However, what do you do in terms of protecting people's accounts? You say that the money is stored in your…",{"id":126,"by":127,"text":128},"2973580","dclaysmith","Question for @zhoutong ... When did you start working on this project and have the negative events (guy losing 500K, MtGox hacking, etc) of the last few months affected your…",{"value":130,"source":63,"evidence":131},"Impressive for a teenager's project",[132],{"id":133,"by":134,"text":135},"2973410","mootothemax","I'm the creator of Bitcoinica. I'm not so established here. To be honest, I'm only 17. You're 17 and you've already created something like this? I see a very bright future ahead…",{"value":137,"source":63,"evidence":138},"Useful for trading practice without real money risk",[139],{"id":66,"by":67,"text":68},[141,156,163,178,185],{"value":142,"source":63,"evidence":143},"Maker is 17, so commenters doubt competence to handle customer money",[144,148,152],{"id":145,"by":146,"text":147},"2973856","dkersten","This is true, I expect him (or her?) to go far! Unfortunately, seeing his age put me off depositing money into the account I just created. When dealing with my money, I want a…",{"id":149,"by":150,"text":151},"2974770","jerf","To be honest, your age isn't a problem, because the average above-average developer is still not competent to write this sort of software. If you had been doing security and…",{"id":153,"by":154,"text":155},"2974944","mkramlich","A brand new financial trading platform written by a lone teenager in China? Here let me give you lots of my money! Not. :-) Somewhat tongue in cheek. I wish you luck and admire…",{"value":157,"source":63,"evidence":158},"Customer funds are held in one pooled account; no segregated funds",[159,162],{"id":160,"by":123,"text":161},"2975537","I already mentioned below that I thought your site was nicely done. But you didn't answer my questions directly which makes me a bit wary. My questions aren't site security…",{"id":122,"by":123,"text":124},{"value":164,"source":63,"evidence":165},"Security is a major concern for a money-handling site",[166,170,174],{"id":167,"by":168,"text":169},"2973803","jellicle","Without meaning to put a damper on your technical work, you should keep in mind a few things: -- systems that work with money are attacked hard and often, by intelligent skilled…",{"id":171,"by":172,"text":173},"2973465","arkitaip","Considering all the security issues with the Bitcoin ecosystem and the resulting mistrust, I think you need to be very explicit about your security.",{"id":175,"by":176,"text":177},"2974032","ByteMuse","I like the site. A few notes: - Running on Heroku is not really an asset security wise. I would put something more significant to ensure users that your site is secure. - Make…",{"value":179,"source":63,"evidence":180},"No margin call policy was visible on the site",[181],{"id":182,"by":183,"text":184},"2975018","ScottBurson","Sadly, I have to agree with this. You're very smart, zhoutong, and your eager and polite acceptance of feedback does you great credit. But I would not attempt what you're doing,…",{"value":186,"source":63,"evidence":187},"Spread seems high",[188],{"id":189,"by":190,"text":191},"2973555","Estragon","Spread seems high.",[193,200,207,214,221],{"value":194,"source":63,"evidence":195},"Allow bitcoin withdrawals",[196],{"id":197,"by":198,"text":199},"2973369","ithkuil","why don't you allow to withdraw bitcoins? Isn't bitcoin built because it's easy to make transactions? Why withdrawal can be done only through mtgox redeemable codes in US dollars?",{"value":201,"source":63,"evidence":202},"Add a tour page and screenshots",[203],{"id":204,"by":205,"text":206},"2973486","ianpurton","It looks great. It's good to see more things appear in the Bitcoin space. I would add a tour page, perhaps with screenshots so people can see how it works without signing up.",{"value":208,"source":63,"evidence":209},"Add a security section and terms or privacy policy",[210],{"id":211,"by":212,"text":213},"2973514","Joakal","Looks pretty cool. I dislike the random pink highlighting, it's noisy. Avoid smiles, as cool as it is, you must look professional in business ;) That said, maybe a security…",{"value":215,"source":63,"evidence":216},"Support PayPal deposits",[217],{"id":218,"by":219,"text":220},"2973446","samrat","Hi, does it support PayPal?",{"value":222,"source":63,"evidence":223},"Add tooltips and a visible logout button",[224,225],{"id":66,"by":67,"text":68},{"id":226,"by":227,"text":228},"2973548","ArchD","How do I logout without a logout button?",[230,238,242,246],{"value":231,"source":63,"evidence":232},"How is margin liquidation and margin call handled?",[233,234],{"id":182,"by":183,"text":184},{"id":235,"by":236,"text":237},"2974699","vessenes","Can you explain your margin fees somewhere on the site? Thanks!",{"value":239,"source":63,"evidence":240},"How can users trust the operator with their money?",[241],{"id":160,"by":123,"text":161},{"value":243,"source":63,"evidence":244},"How are the margin accounts funded?",[245],{"id":160,"by":123,"text":161},{"value":247,"source":63,"evidence":248},"What is a Mt. Gox redeemable code?",[249],{"id":175,"by":176,"text":177},[251,258,265,272,279],{"value":252,"source":63,"evidence":253},"Mt. Gox",[254,257],{"id":255,"by":198,"text":256},"2973402","I don't want to use mt.gox, I moved all my money out of them because the way they treated me and other customers, blocking my account and my money for a lot of time; that's why…",{"id":59,"by":11,"text":60},{"value":259,"source":63,"evidence":260},"Tradehill",[261],{"id":262,"by":263,"text":264},"2973434","jerguismi","I think only alternative is tradehill, and their interface\u002Ffeatures suck.",{"value":266,"source":63,"evidence":267},"Intersango",[268],{"id":269,"by":270,"text":271},"2989167","phantomcircuit","i run intersango.com we have a solid platform that is rapidly advancing sign up and give it a try",{"value":273,"source":63,"evidence":274},"Ruxum",[275],{"id":276,"by":277,"text":278},"2975025","SkyMarshal","http:\u002F\u002Fruxum.com (also http:\u002F\u002Fcampbx.com). Fwiw, I've seen one or two posts over on reddit.com\u002Fr\u002Fbitcoin offering invite codes to Ruxum in the past few weeks.",{"value":280,"source":63,"evidence":281},"CampBX",[282],{"id":276,"by":277,"text":278},{"comments":284,"answered":285,"key":286},25,12,[287,290,291],{"id":288,"text":289},"2973313","Hi HN, I'm the creator of Bitcoinica. I'm not so established here. To be honest, I'm only 17. Please try it out. (I can pay $1 for you if you're not willing\u002Fable to deposit,…",{"id":56,"text":57},{"id":292,"text":293},"2973475","Thank you for your encouragement! Wish you good luck in your careers too!",{"commenters":35,"max_depth":295,"maker_replies":284,"first_comment_mins":48,"lifespan_hours":296},8,108,[298,300,302,304,306,307,310,312,313,315,316,318,320,322,323,325,329,331,335,336,338,340,342,346,348,351,354,358,360,361,364,367,368,371,373,375,378,381,382,384,386,388,391,394,397,398,401,404,406,409,412,414,416,417,420,421,423,424,425,428,429,432,434,437,440,442,444,446,448,450,453,456,458,460,462,465,467,468,470,471,474,478,479,482,484,486,488,490,494,497,499,502,504],[288,39,39,299,11,45],"maker\u002Fneutral\u002Fnone",[197,39,38,301,198,39],"project\u002Fneutral\u002Fdesign",[56,39,39,303,11,45],"project\u002Fneutral\u002Fidea",[255,39,39,305,198,39],"commenter\u002Fneutral\u002Fnone",[262,39,39,305,263,39],[308,39,39,305,309,39],"2973596","khafra",[276,39,39,311,277,39],"other\u002Fneutral\u002Fnone",[269,39,39,311,270,39],[133,39,48,314,134,39],"maker\u002Fpositive\u002Fnone",[292,39,39,314,11,45],[145,39,38,317,146,39],"maker\u002Fmixed\u002Fnone",[319,39,39,299,11,45],"2974133",[149,39,45,321,150,39],"project\u002Fcritical\u002Fidea",[182,39,38,303,183,39],[324,39,39,303,11,45],"2975354",[326,39,39,327,328,39],"2975614","commenter\u002Fcritical\u002Fidea","rmc",[330,39,45,321,146,39],"2977802",[332,39,38,333,334,39],"2974781","project\u002Fneutral\u002Fnone","dotBen",[218,39,38,333,219,39],[337,39,39,333,11,45],"2973506",[339,39,45,321,119,39],"2973595",[341,39,39,333,11,45],"2973702",[343,39,48,344,345,39],"2973608","project\u002Fpositive\u002Fdesign","earle",[167,39,45,347,168,39],"project\u002Fcritical\u002Fexecution",[349,39,39,350,11,45],"2973937","maker\u002Fneutral\u002Fexecution",[352,39,45,347,353,39],"2976031","forensic",[355,39,38,356,357,39],"2974534","project\u002Fneutral\u002Fexecution","srdev",[359,39,38,356,277,39],"2974972",[107,39,39,350,11,45],[362,39,38,356,363,39],"2976500","MatthewPhillips",[365,39,38,356,366,39],"2976573","getsat",[87,39,39,356,11,45],[369,39,39,370,366,39],"2976776","commenter\u002Fneutral\u002Fexecution",[372,39,38,356,366,39],"2975010",[374,39,39,356,11,45],"2976502",[376,39,38,356,377,39],"2976870","teyc",[379,39,45,321,380,39],"2983515","elementsoftrust",[118,45,45,321,119,39],[383,45,39,303,11,45],"2973470",[385,45,45,321,119,39],"2973575",[387,45,39,299,11,45],"2973651",[389,45,39,311,390,39],"2975377","nitrogen",[175,392,38,393,176,39],2,"project\u002Fmixed\u002Fdesign",[395,392,45,347,396,39],"2974717","tptacek",[153,38,45,321,154,39],[399,33,38,303,400,39],"2973561","jonpaul",[402,33,39,403,328,39],"2973656","commenter\u002Fneutral\u002Fidea",[405,33,39,311,270,39],"2989182",[407,33,39,311,408,39],"2973851","apsec112",[410,33,39,311,411,39],"2974165","cjy",[413,33,39,311,408,39],"2974295",[415,33,39,311,411,39],"2976470",[122,48,38,303,123,39],[418,48,39,419,11,45],"2974449","maker\u002Fneutral\u002Fidea",[160,31,45,321,123,39],[422,31,39,419,11,45],"2976401",[171,18,38,356,172,39],[59,18,39,356,11,45],[426,18,45,347,427,39],"2973567","michael_dorfman",[101,18,39,356,11,45],[430,18,39,370,431,39],"2973796","acangiano",[433,18,39,350,11,45],"2973954",[435,18,39,305,436,39],"2973974","bhousel",[438,18,39,370,439,39],"2974031","bdonlan",[441,18,39,350,11,45],"2974155",[443,18,45,347,119,39],"2973830",[445,18,45,347,328,39],"2974078",[447,18,45,347,134,39],"2974318",[449,18,38,356,357,39],"2974556",[451,18,45,452,396,39],"2974740","maker\u002Fcritical\u002Fnone",[454,18,45,321,455,39],"2974867","patio11",[457,18,45,347,328,39],"2977425",[459,18,45,321,455,39],"2974695",[461,18,45,347,328,39],"2973663",[463,18,39,370,464,39],"2973750","rheide",[126,295,48,466,127,39],"maker\u002Fpositive\u002Fdesign",[79,295,39,299,11,45],[469,295,48,314,127,39],"2974522",[211,43,38,393,212,39],[472,43,39,473,11,45],"2973523","maker\u002Fneutral\u002Fdocs",[475,43,48,476,477,39],"2973546","maker\u002Fpositive\u002Fdocs","davedx",[66,41,38,393,67,39],[480,41,39,481,11,45],"2973945","maker\u002Fneutral\u002Fdesign",[204,483,48,344,205,39],11,[485,483,39,473,11,45],"2973516",[235,285,38,487,236,39],"project\u002Fneutral\u002Fpricing",[226,489,38,301,227,39],13,[491,489,39,492,493,39],"2973601","commenter\u002Fneutral\u002Fdesign","Kudos",[495,489,39,305,496,39],"2973658","WA",[498,489,39,481,11,45],"2973644",[189,500,45,501,190,39],14,"project\u002Fcritical\u002Fpricing",[73,500,39,503,11,45],"maker\u002Fneutral\u002Fpricing",[505,500,39,506,67,39],"2973740","commenter\u002Fneutral\u002Fpricing",[],[509,514,519,524,528,532],{"id":510,"name":511,"points":512,"category":513},"2976764","Smozzy (for Android\u002FT-Mobile)",293,"consumer_social",{"id":515,"name":516,"points":517,"category":518},"2992146","PickHealthInsurance.com",232,"web_saas",{"id":520,"name":521,"points":522,"category":523},"2991206","Final Touch",194,"dev_tools",{"id":525,"name":526,"points":527,"category":523},"2983033","PyCloud",130,{"id":529,"name":530,"points":531,"category":523},"2993371","Stack Parts",82,{"id":533,"name":534,"points":535,"category":518},"2973564","Ernie's",71,false,"v2",{"id":539,"name":5,"line":6,"ai":536,"cat":20,"year":13,"points":14,"comments":15,"rec":28,"s":540,"top":18,"kw":541,"maker":11,"domain":10,"tier":19,"attempts":39,"strip":542,"url":9,"mix":543,"praise":115,"objection":142,"sub":21},2973301,-0.22,[24,25,26,27],"3005313133113331111100313100111155535301",[31,32,33,34],1793990874910]