cwhinfrey

0x0101A4dca362c653f7dE9772Ab1b8C4550738000

cwhinfrey

I'd like to introduce two possible prediction market setups for implementing futarchy. First I will review 3 types of prediction markets. Then I will apply these to 2 different Futarchy models.

Introduction to Prediction Market Setups

If you already have a good understanding of categorical, scalar, and conditional prediction markets, feel free to skip this section.

Each prediction market has a question, a collateral token, and at least two outcome tokens covering the possible outcomes of the question. At any point one collateral token can be locked up in exchange for one of each outcome token and likewise, a complete set of outcome tokens can be exchanged back for a collateral token.

1. Categorical markets - Categorical markets have a set of possible outcomes. When the market is resolved to one of those outcomes, that outcome token can be redeemed for a collateral token.

cwhinfrey

contracts/Storage.sol
  12:0    warning    'Storage' has no comment.    zeppelin/missing-natspec-comments

contracts/estate/EstateRegistry.sol
  15:0      warning    'EstateRegistry' has no natspec comment.                                 zeppelin/missing-natspec-comments
  48:2      warning    'mint' has no natspec title comment.                                     zeppelin/missing-natspec-comments
  58:2      warning    'mint' has no natspec title comment.                                     zeppelin/missing-natspec-comments
  72:2      warning    'onERC721Received' has no natspec title comment.                         zeppelin/missing-natspec-comments
  93:2      warning    'transferLand' has no natspec title comment.                             zeppelin/missing-natspec-comments
  110:2     warning    'transferManyLands' has no natspec title comment.                        zeppelin/missing-natspec-comments

cwhinfrey

contract Futarchy is IForwarder, AragonApp {

    // FutarchyOracleFactory comes from Gnosis https://github.com/gnosis/pm-contracts/blob/v1.0.0/contracts/Oracles/FutarchyOracleFactory.sol
    // BoundsOracle - Calculates the upper and lower bounds for creating a new FutarchyOracle
    // PriceFeedOracle - Is used to resolve all futarchy decision markets
    function initialize(
      FutarchyOracleFactory _futarchyOracleFactory, 
      BoundsOracle _boundsOracle, 
      PriceFeedOracle _priceFeedOracle,
      uint256 _decisionTime,

cwhinfrey

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure.
 * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
  using SafeMath for uint256;
    
  function safeTransfer(

cwhinfrey

pragma solidity ^0.4.24;


library ECDSA {

  /**
   * @dev Recover signer address from a message by using their signature
   * @param hash bytes32 message, the hash is the signed message. What is recovered is the signer address.
   * @param signature bytes signature, the signature is generated using web3.eth.sign()
   */

cwhinfrey

pragma solidity ^0.4.24;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, reverts on overflow.

cwhinfrey

Proposed directory structure:

contracts/
  escrow/
    ConditionalEscrow.sol
    Escrow.sol
    RefundEscrow.sol
  payment/
    PullPayment.sol
    SplitPayment.sol

cwhinfrey

pragma solidity ^0.4.24;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
import "../../introspection/ERC165.sol";


/**

cwhinfrey

contract MemoryAndStorageViewer {
    
    uint256 storageVar1 = 23;
    bytes32 storageVar2 = 0x12345;
    uint8 storageVar3 = 55;
    uint8 storageVar4 = 123;
    
    function printStorage() 
        public
        view