ビットコイン以前のデジタル通貨の歴史

• 簡単な自分用メモ
• ざっくりとした色々な人のビットコイン以前のデジタル通貨の歴史観

斉藤賢爾さんのスライド

• 徹底サーベイ : デジタル通貨の15年

• 1983: Blind signature

• 1990s: Magic Money
• 1997: Hashcash
• 2000: MojoNation
• 2003: Karma
• 2003: Samsara
• 2003: PPay
• 2003: i-WAT
• 200?: Ripple
• 2008: SSC
• 2008: Bitcoin
• 2014: Ethereum

Wikipedia

• History of Bitcoin – Wikipedia, the free encyclopedia

• ecash: David Chaum, Stefan Brands

• hashcash: Adam Back
• b-money: Wei Dai
• bit gold: Nick Szabo
• RPOW: Hal Finney

10 Digital Currency Platforms

• 10 Digital Currency Platforms Before Bitcoin You Probably Never Heard Of

Arvind Narayanan at Prenston Univ.

Arvind NarayananさんはTwitterを使っています: “The Long Road to Bitcoin https://t.co/kmIpVHJsqa Preface to our upcoming textbook, contributed by Jeremy Clark based on his awesome lecture.”

Gwern Branwen

• Bitcoin is Worse is Better – Gwern.net

2001: SHA-256 finalized
1999-present: Byzantine fault tolerance (PBFT etc.)
1999-present: P2P networks (excluding early networks like Usenet or FidoNet; MojoNation & BitTorrent, Napster, Gnutella, eDonkey, Freenet, i2p etc.)
1998: Wei Dai, B-money5
1997: HashCash; 19986: Nick Szabo, Bit Gold; ~2000: MojoNation/BitTorrent; ~2001-2003, Karma, etc
1992-1993: Proof-of-work for spam7
1991: cryptographic timestamps
1980: public key cryptography8
1979: Hash tree

Before Bitcoin

A Quick History of Cryptocurrencies BBTC — Before Bitcoin | Bitcoin Magazine

Early Days

• 1980s: Netherlands: Albert eijin: POS(point-of-sale)

Digital Cash

• 1983: David Chaum(an American cryptographer): DigiCash

Second Wave – Web Based Money

• e-gold

The Regulatory Bust

• 2008: Bitcoin

Ryan X. Charles

• 1976: Public Key Cryptography (Diffie-Hellman)
• 1990-1998: DigiCash
• 1997: Hashcash (Adam Back)
• 1998: b-money (Wei Dai)
• 2005? 2008?: Bit Gold (Nick Szabo)
• 2008: Bitcoin Whitepaper
• 2009: Bitcoin Genesis Block

https://github.com/ryanxcharles/blockchain-university/blob/master/slides/2015-12-19-1-overview-bitcoin-blockchain.pdf