PITCHME.md

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Blockchain

Background, Basics, and Beyond

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So Hot Right Now

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Blockchain Background

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Types of Networks

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Centralized

1. Single node (single point of failure)
2. Controlled by a single entity

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Examples:

• Many Internet services
• Websites (some)
• Bulletin Board Systems (BBS)
• File Servers

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Decentralized

1. Multiple nodes
2. Controlled by the same entity

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Examples:

• Most Internet services
• Websites (modern)
• Content Delivery Networks (CDN)
• Load Balancers
• DNS

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Distributed

1. Many discrete nodes
2. Control of any arbitrary entity

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Examples

• The Internet
• Email
• Bittorrent
• TOR
• Correspondence Chess??

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Let's Play Chess

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Alice and Eve play Correspondence Chess

• Alice: 1 e4
• Eve replies 1 e5
• Alice replies 2 Nf3
• ...

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Distributed Ledger

• Alice: 1 e4
• Eve replies 1 e5
• Alice replies 2 Nf3
• ...

Distributed Ledger = Blockchain

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Blockchain Beginnings

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1991

Haber and Stornetta

How to Time-Stamp a Digital Document

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2008

Satoshi Nakamoti

Bitcoin paper

Solves the double-spend problem

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Crypto Review

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Hashing

$ echo 'blockchain' | sha256sum
5318d781b12ce55a4a21737bc6c7906db0717d0302e654670d54fe048c82b041
$ echo 'Blockchain' | sha256sum
fe7d0290395212c39e78ea24ba718911af16effa13b48d1f6c9d86e8355e0770

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Public Key Cryptography

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• Transactions |
• Proof of Work |

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Transactions

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Proof of Work

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Goal: Block hash below threshold

Nonce

• 0001 |
• 0002 |
• 0003 |
• etc |

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Bitcoin Evolution

Growth

• 100GB+ |
• 1092 'Altcoins' |

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• Proof of Work |
• Smart Contracts |
• Ethereum Virtual Machine (Ethereum World Computer) |

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Blockchain Future

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Permissionless or Permissioned?

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Permissionless (Public):

• Publicly readable (& verifiable)
• Publicly writable
• Bitcoin
• Ethereum

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Permissioned (Private):

• Publicly or privately readable
• Privately writable
• Sovrin

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Applications

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Chain of Custody

• Manufacturing - (RF DNA) |
• Evidence |

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Off-Ledger Integration

Case Study: Real Estate

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• 2015 Linux Foundation |
• Many different blockchains and tools |

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Hyperledger Indy

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Privledge

Private Permissioned Ledger

• Python 3.5 |
• MIT License |
• github.com/elBradford/privledge |

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Demo