Udacity Blockchain Capstone

The capstone will build upon the knowledge you have gained in the course in order to build a decentralized housing product.

Libraries and tools used

nodejs v18.16.0
npm 9.5.1
Truffle v5.10.0 (core: 5.10.0)
Solidity v0.5.5 (solc-js)
web3js 4.0.2

Install

This repository contains Smart Contract code in Solidity (using Truffle), tests (also using Truffle)

To install, download or clone the repo, then:

npm install

To run truffle tests:

cd eth-contracts

truffle develop

> compile

> test

Deploy (Sepolia testnet)

truffle compile

truffle migrate --network sepolia

Mint tokens using mint.js

node mint.js

Contract address and token tracker on etherscan.io (Sepolia testnet)

Contract Address: 0x5f56367dbe3ef954f4e2782dd126121cdb3fe350

Sepolia Etherscan

Contract ABI (SolnSquareVerifier.sol)

[
    {
      "constant": true,
      "inputs": [
        {
          "name": "interfaceId",
          "type": "bytes4"
        }
      ],
      "name": "supportsInterface",
      "outputs": [
        {
          "name": "",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "name",
      "outputs": [
        {
          "name": "",
          "type": "string"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "tokenId",
          "type": "uint256"
        }
      ],
      "name": "getApproved",
      "outputs": [
        {
          "name": "",
          "type": "address"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "tokenId",
          "type": "uint256"
        }
      ],
      "name": "approve",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "totalSupply",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "from",
          "type": "address"
        },
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "tokenId",
          "type": "uint256"
        }
      ],
      "name": "transferFrom",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "_myid",
          "type": "bytes32"
        },
        {
          "name": "_result",
          "type": "string"
        }
      ],
      "name": "__callback",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "owner",
          "type": "address"
        },
        {
          "name": "index",
          "type": "uint256"
        }
      ],
      "name": "tokenOfOwnerByIndex",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "_myid",
          "type": "bytes32"
        },
        {
          "name": "_result",
          "type": "string"
        },
        {
          "name": "_proof",
          "type": "bytes"
        }
      ],
      "name": "__callback",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [],
      "name": "unpause",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "tokenId",
          "type": "uint256"
        }
      ],
      "name": "mint",
      "outputs": [
        {
          "name": "",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "from",
          "type": "address"
        },
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "tokenId",
          "type": "uint256"
        }
      ],
      "name": "safeTransferFrom",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "index",
          "type": "uint256"
        }
      ],
      "name": "tokenByIndex",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "tokenId",
          "type": "uint256"
        }
      ],
      "name": "ownerOf",
      "outputs": [
        {
          "name": "",
          "type": "address"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "owner",
          "type": "address"
        }
      ],
      "name": "balanceOf",
      "outputs": [
        {
          "name": "",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [],
      "name": "pause",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "getOwner",
      "outputs": [
        {
          "name": "",
          "type": "address"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "symbol",
      "outputs": [
        {
          "name": "",
          "type": "string"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "approved",
          "type": "bool"
        }
      ],
      "name": "setApprovalForAll",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "from",
          "type": "address"
        },
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "tokenId",
          "type": "uint256"
        },
        {
          "name": "_data",
          "type": "bytes"
        }
      ],
      "name": "safeTransferFrom",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "tokenId",
          "type": "uint256"
        }
      ],
      "name": "tokenURI",
      "outputs": [
        {
          "name": "",
          "type": "string"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "baseTokenURI",
      "outputs": [
        {
          "name": "",
          "type": "string"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "owner",
          "type": "address"
        },
        {
          "name": "operator",
          "type": "address"
        }
      ],
      "name": "isApprovedForAll",
      "outputs": [
        {
          "name": "",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "newOwner",
          "type": "address"
        }
      ],
      "name": "transferOwnership",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "inputs": [
        {
          "name": "verifierAddress",
          "type": "address"
        },
        {
          "name": "name",
          "type": "string"
        },
        {
          "name": "symbol",
          "type": "string"
        },
        {
          "name": "baseTokenURI",
          "type": "string"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "constructor"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": false,
          "name": "index",
          "type": "uint256"
        },
        {
          "indexed": true,
          "name": "solutionAddress",
          "type": "address"
        }
      ],
      "name": "SolutionAdded",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": false,
          "name": "to",
          "type": "address"
        },
        {
          "indexed": false,
          "name": "tokenId",
          "type": "uint256"
        }
      ],
      "name": "TokenMinted",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "from",
          "type": "address"
        },
        {
          "indexed": true,
          "name": "to",
          "type": "address"
        },
        {
          "indexed": true,
          "name": "tokenId",
          "type": "uint256"
        }
      ],
      "name": "Transfer",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "owner",
          "type": "address"
        },
        {
          "indexed": true,
          "name": "approved",
          "type": "address"
        },
        {
          "indexed": true,
          "name": "tokenId",
          "type": "uint256"
        }
      ],
      "name": "Approval",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "owner",
          "type": "address"
        },
        {
          "indexed": true,
          "name": "operator",
          "type": "address"
        },
        {
          "indexed": false,
          "name": "approved",
          "type": "bool"
        }
      ],
      "name": "ApprovalForAll",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "actor",
          "type": "address"
        }
      ],
      "name": "Paused",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "actor",
          "type": "address"
        }
      ],
      "name": "Unpaused",
      "type": "event"
    },
    {
      "anonymous": false,
      "inputs": [
        {
          "indexed": true,
          "name": "oldOwner",
          "type": "address"
        },
        {
          "indexed": true,
          "name": "newOwner",
          "type": "address"
        }
      ],
      "name": "OwnershipTransferred",
      "type": "event"
    },
    {
      "constant": false,
      "inputs": [
        {
          "components": [
            {
              "components": [
                {
                  "name": "X",
                  "type": "uint256"
                },
                {
                  "name": "Y",
                  "type": "uint256"
                }
              ],
              "name": "a",
              "type": "tuple"
            },
            {
              "components": [
                {
                  "name": "X",
                  "type": "uint256[2]"
                },
                {
                  "name": "Y",
                  "type": "uint256[2]"
                }
              ],
              "name": "b",
              "type": "tuple"
            },
            {
              "components": [
                {
                  "name": "X",
                  "type": "uint256"
                },
                {
                  "name": "Y",
                  "type": "uint256"
                }
              ],
              "name": "c",
              "type": "tuple"
            }
          ],
          "name": "proof",
          "type": "tuple"
        },
        {
          "name": "inputs",
          "type": "uint256[2]"
        },
        {
          "name": "to",
          "type": "address"
        }
      ],
      "name": "addSolution",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    },
    {
      "constant": false,
      "inputs": [
        {
          "components": [
            {
              "components": [
                {
                  "name": "X",
                  "type": "uint256"
                },
                {
                  "name": "Y",
                  "type": "uint256"
                }
              ],
              "name": "a",
              "type": "tuple"
            },
            {
              "components": [
                {
                  "name": "X",
                  "type": "uint256[2]"
                },
                {
                  "name": "Y",
                  "type": "uint256[2]"
                }
              ],
              "name": "b",
              "type": "tuple"
            },
            {
              "components": [
                {
                  "name": "X",
                  "type": "uint256"
                },
                {
                  "name": "Y",
                  "type": "uint256"
                }
              ],
              "name": "c",
              "type": "tuple"
            }
          ],
          "name": "proof",
          "type": "tuple"
        },
        {
          "name": "inputs",
          "type": "uint256[2]"
        },
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "tokenId",
          "type": "uint256"
        }
      ],
      "name": "mintToken",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function"
    }
  ]

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