@liwi 8 December 2021 more from that month

昨天提到在試著了解 raw transaction https://noise.cash/post/1nwjkn85 照著格式基本上很快就可以解構 Raw Tx 的各個組成方塊 但要手作簽署就發現，需要補充的知識還有很多。概念上公私鑰、區塊鏈、UTXO、算力挖礦確保安全性等等構成比特幣作為現金網路的元素讀中本聰的白皮書大概很快就能理解了。 實作上，後見看來，中本聰似乎用了很多不尋常非正規的東西。這不管是在理解上或是打扣上都讓人很困擾阿。難道神秘感也是一種必須嗎... 所以手作時有很大一部分心力都花在資料結構跟編碼解碼上... 想分享的是瀏覽到的關於中本聰設計的 Tx 簽署方式的一則評論： The way signatures is implemented in Bitcoin transactions has stirred much controversy which is ongoing to this day. For a little history on some of this discussion, you might want to check out the posts on Bitcointalk by legendary poster DeathAndTaxes. In a post from May 2014 he writes, “Honestly I have no idea what Satoshi was trying to accomplish with the overly complicated mess that is Bitcoin tx signatures but given a few other questionable decisions (using uncompressed pubkeys, non-canonical signatures, including pubkey in inputs when they could be reconstructed from the signature, etc) I believe as smart as Satoshi was ECDSA wasn’t his strong suit. He used it but he wasn’t an expert at it.” 評論出自一個找到的手作 Raw Tx 教學 [1]，源自 bitcointalk [2] [1] https://klmoney.wordpress.com/bitcoin-dissecting-transactions-part-2-building-a-transaction-by-hand/ [2] https://bitcointalk.org/index.php?topic=141879.msg6541444#msg6541444 那個 as smart as Satoshi 不知道有沒有玩跨語言 pun 的意味 XD 所以比特幣是有進步空間的。Bitcoin Cash Team 應該就是在這樣的路上。 關於 ECDSA（橢圓曲線數位簽章演算法），另外一篇講 Raw Tx 手作的教學文章 http://www.righto.com/2014/02/bitcoins-hard-way-using-raw-bitcoin.html 有很不錯的在比特幣框架下的介紹說明。這個網站的主人 Ken Shirriff 根本超級硬派+old school+超級威猛。 推特上的介紹是這樣的：Restored Apollo Guidance Computer, Put ₿ in Unicode https://twitter.com/kenshirriff 然後部落格有一篇有打孔卡電腦挖礦實作，如附圖。 http://www.righto.com/2015/05/bitcoin-mining-on-55-year-old-ibm-1401.html 雖然算一個 hash 要 80秒根本是搞笑，但這實在是太酷（一ㄡˇ）炫（ㄕˋ）了... - . -