@ProgramTheBlock
Joined October 2017
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Introduction to Ethereum Payment Channels Video: programtheblockchain.com/pos…

Introduction to Ethereum Payment Channels Video

We’ve created a short (32-minute) video to help explain Ethereum payment channels—what they are and how they work. This video complements two of our previous posts: Writing a Simple Payment Channel...

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Implementing Harberger Tax Deeds: programtheblockchain.com/pos…

Implementing Harberger Tax Deeds

This post will demonstrate how to implement deeds that collect a “Harberger tax”. The recently published book, Radical Markets: Uprooting Capitalism and Democracy for a Just Society, proposed...

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Writing a Dollar Auction Contract: programtheblockchain.com/pos…

Writing a Dollar Auction Contract

This post will implement a “dollar auction” contract for ERC20 tokens. It will be a modest change to the English auction contract.

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Writing a Penny Auction Contract: programtheblockchain.com/pos…

Writing a Penny Auction Contract

This post will implement a bidding fee auction (aka “penny auction”) contract for ERC20 tokens. It will be a modest change to the English auction contract.

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Contracts Calling Arbitrary Functions: programtheblockchain.com/pos…
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Anatomy of Transaction Data: programtheblockchain.com/pos…

Anatomy of Transaction Data

[This blog post explains how transaction data is used to invoke smart contracts in Ethereum, but it is not necessary for learning Solidity programming. We write it for those of you who would like a...

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State Channels with Signing Keys: programtheblockchain.com/pos…

State Channels with Signing Keys

In this post, I’ll show how a temporary signing key can be used to improve the user experience of working with state channels.

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Writing a Trivial Multisig Wallet: programtheblockchain.com/pos…

Writing a Trivial Multisig Wallet

This post will demonstrate a very simple multisig wallet. This multisig wallet requires unanimous consent for the transfer of funds, and the consent is collected off-chain via signed messages.

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Performing Multiple Actions Transactionally: programtheblockchain.com/pos…

Performing Multiple Actions Transactionally

This post will demonstrate a simple technique for combining multiple actions into a single transaction. This will enable you to be certain that you get “all or nothing” execution of the combined...

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Ensuring the Effects of a Transaction: programtheblockchain.com/pos…

Ensuring the Effects of a Transaction

This post will demonstrate a simple technique for ensuring that a transaction had the desired effects.

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Working with State Channels in JavaScript: programtheblockchain.com/pos…

Working with State Channels in JavaScript

In this post, I’ll show how to build a JavaScript front end for a two-player game based on state channels. This post is a continuation of my previous posts “Two-Player Games in Ethereum” and “State...

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Supporting an Off-Chain Market Maker: programtheblockchain.com/pos…

Supporting an Off-Chain Market Maker

This post will implement a token-trading “market maker” that will fulfill multiple signed prediction market wagers simultaneously. It will be a modest change to the clearinghouse contract presented...

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Betting Tokens in a Prediction Market: programtheblockchain.com/pos…

Betting Tokens In A Prediction Market

This post will describe how to implement a prediction market where bets are for ERC20 tokens rather than ether.

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Reversible Ether: programtheblockchain.com/pos…

Reversible Ether

In this post, I’ll develop an ERC20 token that acts as “reversible ether” as described by Ethereum’s creator, Vitalik Buterin: Someone should come along and issue an ERC20 called "Reversible Ether"...

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Supporting Off-chain Token Trading: programtheblockchain.com/pos…

Supporting Off-Chain Token Trading

This post will implement a token trading “clearinghouse” that will execute multiple signed trade offers simultaneously.

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"Storage Patterns: Set" programtheblockchain.com/pos…

Storage Patterns: Set

In this post, I’ll build a minimal enumerable set in Solidity. A set stores unordered values without repetition.

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Escrowing ERC20 Tokens: programtheblockchain.com/pos…

Escrowing ERC20 Tokens

[EDIT 2018-06-05] This post has been edited to introduce a transfer function. This post describes a simple contract to escrow ERC20 tokens for a period of time. Keeping tokens (or ether) in escrow is...

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Wrapping Ether in an ERC20 Token: programtheblockchain.com/pos…

Wrapping Ether in an ERC20 Token

In this short post, I’ll show how ether can be “wrapped” in an ERC20-compatible token. This means ether can be used anywhere that an ERC20 token is expected.

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Writing a Prediction Market Contract: programtheblockchain.com/pos…

Writing a Prediction Market Contract

This post will demonstrate how to write a smart contract that implements a prediction market. The contract will leverage much of the logic in my token-based parimutuel betting contract.

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Using Tokens for Parimutuel Wagers: programtheblockchain.com/pos…

Using Tokens for Parimutuel Wagers

This post describes an alternative implementation of parimutuel wagering to my original post. This implementation will use ERC20 tokens to represent wagers.

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