[{"data":1,"prerenderedAt":284},["ShallowReactive",2],{"project-5790382":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":44,"post_text":46,"what":47,"said":68,"maker_in_thread":164,"shape":173,"grid":175,"attempts":245,"same_week":246,"maker_shows":39,"maker_hidden":276,"reader_version":277,"card":278},"5790382","btproof","trusted timestamping on the Bitcoin blockchain","title","Show HN: btproof - trusted timestamping on the Bitcoin blockchain","https:\u002F\u002Fwww.btproof.com\u002F","btproof.com","nadaviv",1369877277,2013,75,29,334,1739,20,"notable","security_privacy","timestamping","web_app",[24,25,26,27],"bitcoin timestamp","proof of existence","blockchain notary","document timestamping","mixed",0.069,{"positive":31,"neutral":32,"mixed":33,"critical":34},5,8,0,4,17,{"execution":37,"idea":38,"performance":40,"privacy":42,"pricing":43},{"positive":33,"critical":33},{"positive":34,"critical":39},2,{"positive":33,"critical":41},1,{"positive":33,"critical":41},{"positive":41,"critical":33},[45,33,41,33,45,41,33,45,33,31,31,33,33,33,33,33,33,45,33,31,45,31,41,33,45,41,31,45,45],3,null,{"problem":46,"audience":46,"pricing":48,"motivation":59,"time_to_build":46,"stack":65,"openness":66,"stage":67,"team_size":66},{"value":49,"source":50,"evidence":51},"About $3 via PayPal per timestamp, with fees paid to miners","maker",[52,56],{"id":53,"by":54,"text":55},"5790541","wayu","Are you really letting people pay with PayPal to send BitCoins to an arbitrary address? If it's just 1 satoshi for $3 you might be fine (if PayPal doesn't notice), but don't even…",{"id":57,"by":11,"text":58},"5790807","You understand it exactly correctly. Also, I'm sending those transactions with 0.01 BTC (~$1.3) in fees, which is roughly half the $3 payment (after credit card processing fees).…",{"value":60,"source":50,"evidence":61},"Technical exercise, possibly useful later",[62],{"id":63,"by":11,"text":64},"5790501","More of a technical exercise, but I could see it coming handy in the future.",[],"unknown","launched",{"praise":69,"objections":92,"requests":112,"questions":129,"alternatives":144},[70,78,85],{"value":71,"source":72,"evidence":73},"Nice work; glad it exists","commenter",[74],{"id":75,"by":76,"text":77},"5790537","gojomo","Nice work; I'm glad this exists. (There have been a few others... see for example the [bitnotar] project.) Some miners don't like such 'dust' (abandoned micro amounts) living…",{"value":79,"source":72,"evidence":80},"Fee share going to miners is a nice touch",[81],{"id":82,"by":83,"text":84},"5791420","oscilloscope","It's a nice touch that such a large percentage of the Paypal price goes to the miners.",{"value":86,"source":72,"evidence":87},"Novel use of p2p and blockchain technology",[88],{"id":89,"by":90,"text":91},"5790805","tlrobinson","One of the most exciting things about bitcoin is the innovation it has sparked in trustless p2p applications. Currencies are just the beginning. A timestamping\u002Fnotary is one use.…",[93,101,105],{"value":94,"source":72,"evidence":95},"Embedding hashes in addresses creates dust outputs that burden nodes",[96,100],{"id":97,"by":98,"text":99},"5793190","labawi","Correct me if I am wrong, but I would argue that creating these addresses with tiny leftover cash amounts creates more of a burden on bitcoin nodes than normal transactions.…",{"id":75,"by":76,"text":77},{"value":102,"source":72,"evidence":103},"Could be abused to buy bitcoins with stolen PayPal funds",[104],{"id":53,"by":54,"text":55},{"value":106,"source":72,"evidence":107},"Using blockchain for non-financial data is questionable",[108],{"id":109,"by":110,"text":111},"5791795","drcross","While I applaud novel uses of technology I am a bit uneasy using the bitcoin blockchain for the purpose of something other than transferring financial value. Couldn't you create…",[113,121],{"value":114,"source":72,"evidence":115},"Use OpenTimestamps or Merkle tree batching",[116,120],{"id":117,"by":118,"text":119},"5790911","gwillen","I think you are better off working with Peter Todd, a bitcoin developer working on opentimestamps (github.com\u002Fopentimestamps), rather than inventing your own thing. He's already…",{"id":75,"by":76,"text":77},{"value":122,"source":72,"evidence":123},"Store hash in transaction comment instead of address",[124,125],{"id":53,"by":54,"text":55},{"id":126,"by":127,"text":128},"5791817","oleganza","I would suggest this to avoid losing coins. 1. Use SHA256 of your document as a private key. 2. Send some money (e.g. 0.01 BTC) to the address created from that private key. 3.…",[130,137],{"value":131,"source":72,"evidence":132},"How does it compare to SSL CA timestamp servers",[133],{"id":134,"by":135,"text":136},"5792946","j_s","What are the advantages of using this for timestamps rather than the SSL CA timestamp servers? http:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FTrusted_timestamping I am looking for a way to prove…",{"value":138,"source":72,"evidence":139},"Why not post hash in newspaper or Usenet archives",[140],{"id":141,"by":142,"text":143},"5790515","mikeash","How would this compare to posting the hash in a public and frequently backed up way such that the date would be generally established by archives? For example, you could take out…",[145,149,153,160],{"value":146,"source":72,"evidence":147},"OpenTimestamps",[148],{"id":117,"by":118,"text":119},{"value":150,"source":72,"evidence":151},"Bitnotar",[152],{"id":75,"by":76,"text":77},{"value":154,"source":72,"evidence":155},"bitcoinproof",[156],{"id":157,"by":158,"text":159},"5790753","tocomment","How does yours compare to this one http:\u002F\u002Fvog.github.io\u002Fbitcoinproof\u002F",{"value":161,"source":72,"evidence":162},"SSL CA timestamp servers",[163],{"id":134,"by":135,"text":136},{"comments":31,"answered":39,"key":165},[166,169,172],{"id":167,"text":168},"5790613","> Theirdispleasure means it's possible some future pruning-rules would discard these from the well-replicated eternally 'live' set of recorded values. The block header contains…",{"id":170,"text":171},"5790563","It is technically possible to add arbitrary data to a transaction with OP_DROP, but it isn't widely supported enough, and most tools for exploring the blockchain won't display it…",{"id":57,"text":58},{"commenters":18,"max_depth":34,"maker_replies":31,"first_comment_mins":174,"lifespan_hours":15},43,[176,178,180,182,186,190,192,193,197,199,201,203,207,211,213,215,217,220,223,224,227,229,232,233,236,237,239,241,242],[75,33,45,177,76,33],"project\u002Fneutral\u002Fexecution",[167,33,33,179,11,41],"maker\u002Fneutral\u002Fexecution",[117,33,41,181,118,33],"project\u002Fcritical\u002Fidea",[183,33,33,184,185,33],"5791801","other\u002Fneutral\u002Fnone","nitrogen",[187,33,45,188,189,33],"5791287","project\u002Fneutral\u002Fperformance","eric_bullington",[53,41,41,191,54,33],"project\u002Fcritical\u002Fprivacy",[170,41,33,179,11,41],[194,41,45,195,196,33],"5790752","project\u002Fneutral\u002Fpricing","fryguy",[57,41,33,198,11,41],"maker\u002Fneutral\u002Fpricing",[82,41,31,200,83,33],"project\u002Fpositive\u002Fpricing",[89,39,31,202,90,33],"project\u002Fpositive\u002Fidea",[204,39,33,205,206,33],"5791098","other\u002Fneutral\u002Fprivacy","meowface",[208,39,33,209,210,33],"5792169","commenter\u002Fneutral\u002Fprivacy","xyzzy123",[212,39,33,209,206,33],"5797109",[214,39,33,209,90,33],"5792469",[216,39,33,209,206,33],"5797091",[218,45,33,219,11,41],"5790474","maker\u002Fneutral\u002Fnone",[221,45,45,219,222,33],"5790492","randall",[63,45,33,219,11,41],[225,45,31,202,226,33],"5790536","chewxy",[141,45,45,228,142,33],"project\u002Fneutral\u002Fidea",[230,45,31,202,231,33],"5790582","nwh",[109,45,41,181,110,33],[234,45,33,235,127,33],"5791830","commenter\u002Fneutral\u002Fidea",[126,45,45,179,127,33],[97,45,41,238,98,33],"project\u002Fcritical\u002Fperformance",[240,34,31,202,185,33],"5791794",[134,31,45,228,135,33],[157,243,45,244,158,33],6,"project\u002Fneutral\u002Fnone",[],[247,252,256,261,266,271],{"id":248,"name":249,"points":250,"category":251},"5794083","Unsplash",357,"creative",{"id":253,"name":254,"points":255,"category":251},"5802043","Logos in Pure CSS",283,{"id":257,"name":258,"points":259,"category":260},"5826530","Yoleo",269,"productivity",{"id":262,"name":263,"points":264,"category":265},"5799272","Codementor",132,"learning_science",{"id":267,"name":268,"points":269,"category":270},"5821421","Infraprint",118,"web_saas",{"id":272,"name":273,"points":274,"category":275},"5813542","Reveal",113,"dev_tools",false,"v2",{"id":279,"name":5,"line":6,"ai":276,"cat":20,"year":13,"points":14,"comments":15,"rec":28,"s":280,"top":18,"kw":281,"maker":11,"domain":10,"tier":19,"attempts":33,"strip":282,"url":9,"mix":283,"praise":71,"objection":94,"sub":21},5790382,0.07,[24,25,26,27],"30103103055000000305351031533",[31,32,33,34],1794036507244]