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Conference Presentation, Lecture

An Intro to Crypto: Building Blocks

a16zLinda Xie, Linda Shea
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Personal Motivations & Market Context

  • Linda Shea, co-founder of Scalar Capital, cites her parents' experience during China's Cultural Revolution (property seizure) and the inefficiency of cross-border remittances as key drivers for her interest in Bitcoin.
  • Shea's background in risk management at AIG following the 2008 financial crisis highlighted the fragility and delays of centralized banking systems.
  • Banking Inefficiency Example: In 2008, Mitsubishi UFJ transferred $9 billion to Morgan Stanley via a physical check due to bank closures in the US and Japan, illustrating the inability to move capital rapidly across borders.
  • Unbanked Population: Over 2 billion people worldwide lack access to traditional banking systems.
  • Currency Instability: Hyperinflation events in Venezuela and Zimbabwe (issuing a $100 trillion note) underscore the risks of relying solely on government-backed currencies.

Evolution of Digital Currency

  • Pre-Bitcoin Attempts:
    • DigiCash (1990–1998): Founded by cryptographer David Chaum; failed due to centralized control points and bankruptcy.
    • eGold (1996): Enabled instant gold transfers but was suspended due to legal issues.
  • The Double-Spend Problem: Early digital currencies required centralized ledgers to prevent a single unit of currency from being spent multiple times, necessitating trusted third parties.
  • Bitcoin Launch (2009): Created by the pseudonymous Satoshi Nakamoto (identity and current activity status unknown).
  • Core Mechanisms:
    • Blockchain: A distributed public ledger allowing peer-to-peer consensus on transaction history without a central authority.
    • Cryptography: Uses math and computer science to prevent forgery, ensure immutability, and uniquely identify owners.
    • Proof of Work (PoW): A consensus mechanism where miners solve complex mathematical problems to validate transactions and secure the network; the first to solve it earns the right to add a block and receives Bitcoin as a reward.
  • Mining Evolution:
    • Shifted from individual computers using CPUs to specialized Application-Specific Integrated Circuits (ASICs).
    • Current mining operations require industrial-grade hardware, significant electricity (comparable to small nations), and are inaccessible to casual individuals.

Ethereum & Smart Contracts

  • Ethereum Launch (2015): Founded by known, active developers (unlike Satoshi), raising $18 million via an Initial Coin Offering (ICO).
  • Smart Contracts: Self-executing code that replaces legal "if-then" conditions, enabling transactions without intermediaries.
  • Proof of Stake (PoS): Ethereum aims to transition from energy-intensive PoW to PoS, requiring validators to hold "skin in the game" while significantly reducing electricity consumption.
  • Token Creation: Low barriers to entry allow anyone to create tokens (representing assets, stocks, bonds, voting rights, or utilities) with supply, name, and decimals easily configurable.
  • Ecosystem Scale: CoinMarketCap lists over 1,600 crypto assets with a combined market capitalization of $400 billion.

Applications & Use Cases

  • Decentralized Applications (dApps): Applications running on decentralized networks where tokens are often required for access.
  • Decentralized Exchanges (DEXs): Allow token swapping via smart contracts without custodial third parties.
  • Initial Coin Offerings (ICOs): Public fundraising methods used by teams (often pre-product) to sell tokens; Telegram raised $1.7 billion via an ICO.
    • Risks: High prevalence of scams and regulatory uncertainty.
  • CryptoKitties: A 2017 dApp demonstrating viral growth through digital collectibles, causing a temporary spike in Ethereum network traffic.
  • Augur: A decentralized prediction market platform allowing users to bet on event outcomes.
    • Decentralized Oracle: Uses token holders to report outcomes rather than centralized data feeds (e.g., Reuters).
    • Use Cases: Beyond betting, used for insurance, hedging, and "futarki" (policy decisions based on prediction market outcomes).
  • Filecoin: A decentralized storage network competing with centralized providers like Amazon.
    • Mechanism: Users rent out spare storage space and earn Filecoin tokens.
    • Fundraising: Raised $257 million in private and public sales.

Network Governance & Security

  • Forks: Open-source code allows for copying and modifying projects to run parallel experiments or create dissenting chains (e.g., Litecoin, a Bitcoin fork with faster confirmations and different mining algorithms).
  • Privacy & Pseudonymity:
    • Bitcoin and Ethereum are pseudonymous (public addresses vs. real identities), not anonymous.
    • De-anonymization Risks: Services like Chainalysis and Elliptic use machine learning to trace identities, especially when addresses are linked to KYC-verified exchanges.
    • Privacy Coins: Monero and Zcash offer selective transparency via "view keys," allowing users to hide transaction details from the public while sharing them selectively for audits.
  • Decentralized Autonomous Organizations (DAOs): Entities governed by encoded smart contract rules, potentially replacing traditional corporate structures.
  • New Economic Systems: Blockchain technology enables rapid experimentation with new governance models and user-owned identity/reputation data, moving beyond simple currency to broader social and economic restructuring.