At present, property titles are often paper-based, creating opportunities for errors and fraud. Title professionals find defects in 25% of all titles during the transaction process, according to the American Land Title Association.
Any identified defect makes it illegal to transfer a property title to a buyer until it is rectified. This means property owners often incur high legal fees to ensure authenticity and accuracy of their property titles.
Moreover, title fraud poses a risk to homeowners worldwide. US losses associated with title fraud reportedly averaged around $103,000 per case in 2015, compelling many property buyers to purchase title insurance.
These title management issues could potentially be mitigated by using blockchain technology to build immutable digital records of land titles and using blockchain for transparent transactions. This approach could simplify property title management, making it more transparent and helping to reduce the risk of title fraud and the need for additional insurance.
In this project we minted our own tokens to represent title to the properties. Before the token is minted, the property will be verified. zk-SNARKs will bw used to create a verification system which can prove title to the property without revealing that specific information on the property.
Once the token has been verified it will be placed on a blockchain market place (OpenSea) for others to purchase.
- Truffle v5.0.15 (core: 5.0.15)
- Solidity - 0.5.2 (solc-js)
- Node v10.15.3
- Web3.js v1.5.3
This repository contains Smart Contract code written in solidity and tests using Javascript. To run the code: Download the project folder and open in your preferred code editor e.g Visual Studio Code
- Navigate to your project folder:
cd Real Estate Capstone Project - Then run
npm install - Navigate to eth-contracts folder and then run
npx truffle compileUse npx truffle compile to compile contracts as oraclize.sol was failing to compile with truffle compile. Read more
- Navigate to folder zokrates\code\
- Run zokrates docker image
docker run -v $(pwd):/home/zokrates/code -it zokrates/zokrates:0.3.0 /bin/bash - compile the program by:
cd code~zokrates compile -i square/square.code
- Generate the trusted setup by:
~/zokrates setup
- Compute witness for your desired pair of number by running
~/zokrates compute-witness -a 10 100 - Generate proof
~/zokrates generate-proof - Generate verifier.sol
~/zokrates export-verifier
After compiling the contracts, run the following command:
truffle develop
This will create a local developement blockchain. Inside the terminal run the following command: truffle test
Deploy the contract to goerli network by running: truffle deploy --network goerli
- Account: 0x21180db4a88a0Aa5F0573d77A1BFcF7D7Ea4E3EF
- SolnSquareVerifier contract address: 0x8b485436c95c9381cb498a650ea4157d51af943e
- Verifier contract: 0x203b47cd61bcb569fcca830a965a03c1d5f9ab93
node mint-goerli.js
contract ABI can be found in the following folder: eth-contracts/build/contracts
{
"contractName": "SolnSquareVerifier",
"abi": [
{
"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": true,
"inputs": [],
"name": "solVerifier",
"outputs": [
{
"name": "",
"type": "address"
}
],
"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": "solVerifierAddr",
"type": "address"
},
{
"name": "_name",
"type": "string"
},
{
"name": "_symbol",
"type": "string"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "constructor"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "solIndex",
"type": "uint256"
},
{
"indexed": true,
"name": "solAddress",
"type": "address"
}
],
"name": "SolutionAdded",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "idx",
"type": "uint256"
},
{
"indexed": true,
"name": "addr",
"type": "address"
}
],
"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": "_from",
"type": "address"
}
],
"name": "Paused",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "_from",
"type": "address"
}
],
"name": "Unpaused",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "_from",
"type": "address"
},
{
"indexed": true,
"name": "_to",
"type": "address"
}
],
"name": "OwnershipTransferred",
"type": "event"
},
{
"constant": false,
"inputs": [
{
"name": "_idx",
"type": "uint256"
},
{
"name": "_addr",
"type": "address"
}
],
"name": "addSolution",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "A",
"type": "uint256[2]"
},
{
"name": "A_p",
"type": "uint256[2]"
},
{
"name": "B",
"type": "uint256[2][2]"
},
{
"name": "B_p",
"type": "uint256[2]"
},
{
"name": "C",
"type": "uint256[2]"
},
{
"name": "C_p",
"type": "uint256[2]"
},
{
"name": "H",
"type": "uint256[2]"
},
{
"name": "K",
"type": "uint256[2]"
},
{
"name": "input",
"type": "uint256[2]"
},
{
"name": "index",
"type": "uint256"
},
{
"name": "to",
"type": "address"
}
],
"name": "mintNewToken",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
}
],
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"source": "pragma solidity ^0.5.0;\n\nimport \"./ERC721MintableComplete.sol\";\nimport \"openzeppelin-solidity/contracts/math/SafeMath.sol\";\n\n// TODO define a contract call to the zokrates generated solidity contract <Verifier> or <renamedVerifier>\n\nimport \"./Verifier.sol\";\n\n\n// TODO define another contract named SolnSquareVerifier that inherits from your ERC721Mintable class\ncontract SolnSquareVerifier is ERC721MintableComplete{\n // TODO define a solutions struct that can hold an index & an address\n struct Solution {\n uint256 index;\n address addr;\n }\n\n using SafeMath for uint256;\n\n // TODO define an array of the above struct\n Solution[] private solutions;\n\n // TODO define a mapping to store unique solutions submitted\n mapping (bytes32 => Solution) solutionsMap;\n\n Verifier public solVerifier;\n\n constructor(address solVerifierAddr, string memory _name, string memory _symbol) \n ERC721MintableComplete(_name, _symbol) \n public\n {\n solVerifier = Verifier(solVerifierAddr);\n }\n\n // TODO Create an event to emit when a solution is added\n event SolutionAdded(uint256 indexed solIndex, address indexed solAddress);\n event TokenMinted(uint256 indexed idx, address indexed addr);\n\n // Modifier to check if solution is unique\n modifier isUnique(uint256 _idx, address _addr) {\n bytes32 key = keccak256(abi.encodePacked(_idx, _addr));\n require(solutionsMap[key].addr == address(0), \"Solution already exists\");\n _;\n }\n\n\n // TODO Create a function to add the solutions to the array and emit the event\n function addSolution(uint256 _idx, address _addr) public {\n Solution memory newSolution = Solution({index: _idx, addr:_addr});\n solutions.push(newSolution);\n bytes32 key = keccak256(abi.encodePacked(_idx, _addr));\n solutionsMap[key] = newSolution;\n emit SolutionAdded(_idx, _addr); \n }\n\n\n // TODO Create a function to mint new NFT only after the solution has been verified\n // - make sure the solution is unique (has not been used before)\n // - make sure you handle metadata as well as tokenSuplly\n function mintNewToken(\n uint[2] memory A,\n uint[2] memory A_p,\n uint[2][2] memory B,\n uint[2] memory B_p,\n uint[2] memory C,\n uint[2] memory C_p,\n uint[2] memory H,\n uint[2] memory K,\n uint[2] memory input,\n uint256 index,\n address to\n ) \n public\n isUnique(index, to)\n {\n require(solVerifier.verifyTx(A, A_p, B, B_p, C, C_p, H, K, input), \"Solution verification failed\");\n addSolution(index, to);\n super.mint(to, index);\n emit TokenMinted(index, to);\n\n }\n\n}\n",
"sourcePath": "C:\\Users\\personal\\Desktop\\Udacity_Blockchain_Capstone-main\\eth-contracts\\contracts\\SolnSquareVerifier.sol",
"ast": {
"absolutePath": "project:/contracts/SolnSquareVerifier.sol",
"exportedSymbols": {
"SolnSquareVerifier": [
8005
]
},
"id": 8006,
"nodeType": "SourceUnit",
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{
"id": 7795,
"literals": [
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".0"
],
"nodeType": "PragmaDirective",
"src": "0:23:7"
},
{
"absolutePath": "project:/contracts/ERC721MintableComplete.sol",
"file": "./ERC721MintableComplete.sol",
"id": 7796,
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"symbolAliases": [],
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{
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},
{
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{
"arguments": null,
"baseName": {
"contractScope": null,
"id": 7799,
"name": "ERC721MintableComplete",
"nodeType": "UserDefinedTypeName",
"referencedDeclaration": 1468,
"src": "393:22:7",
"typeDescriptions": {
"typeIdentifier": "t_contract$_ERC721MintableComplete_$1468",
"typeString": "contract ERC721MintableComplete"
}
},
"id": 7800,
"nodeType": "InheritanceSpecifier",
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],
"contractDependencies": [
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528,
1019,
1317,
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],
"contractKind": "contract",
"documentation": null,
"fullyImplemented": true,
"id": 8005,
"linearizedBaseContracts": [
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1019,
528,
482,
405
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"name": "SolnSquareVerifier",
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"id": 7805,
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"typeString": "uint256"
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"src": "650:28:7",
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"typeString": "struct SolnSquareVerifier.Solution[]"
},
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- https://testnets.opensea.io/assets/0x8b485436c95c9381cb498a650ea4157d51af943e/1
- https://testnets.opensea.io/assets/0x8b485436c95c9381cb498a650ea4157d51af943e/2
- https://testnets.opensea.io/assets/0x8b485436c95c9381cb498a650ea4157d51af943e/3
- https://testnets.opensea.io/assets/0x8b485436c95c9381cb498a650ea4157d51af943e/4
- https://testnets.opensea.io/assets/0x8b485436c95c9381cb498a650ea4157d51af943e/5
- https://testnets.opensea.io/assets/0x8b485436c95c9381cb498a650ea4157d51af943e/6
- https://testnets.opensea.io/assets/0x8b485436c95c9381cb498a650ea4157d51af943e/7
- https://testnets.opensea.io/assets/0x8b485436c95c9381cb498a650ea4157d51af943e/8
- https://testnets.opensea.io/assets/0x8b485436c95c9381cb498a650ea4157d51af943e/9
- https://testnets.opensea.io/assets/0x8b485436c95c9381cb498a650ea4157d51af943e/10
-
https://goerli.etherscan.io/tx/0x5f5c9dbfcdcf955d633b79953b37c98fec6dfdc5cb65ce71918cf11e91d09e64
-
https://goerli.etherscan.io/tx/0xfc04bd6fb245b905a6c2f666f54d7eae8e10fc69c504a94166e75fda0716c572
-
https://goerli.etherscan.io/tx/ 0xb523ec8c245cfeb3ec641ac9df47cfdfd367cd3a6c55bd48d9cbf6993efc6633
-
https://goerli.etherscan.io/tx/0x221c15b3ac220c2fbd40b68eb3411632273933159fab175d2712e5bc93267967
-
https://goerli.etherscan.io/tx/0x1e0c7d86f6d2e0edee9590f3366d1ec655d1732fab06fa47b02b09af78590bc0
-
https://goerli.etherscan.io/tx/0x67329218e43a381f748a2a77d9d5800d994a5df43a7a92dd6792a9607ebae558
-
https://goerli.etherscan.io/tx/0x8cebc7c039e76f265f547002e79892b8bb8142ce335dc668071bcb7e492eed07
- Remix - Solidity IDE
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- https://medium.com/blockchangers/how-to-fix-your-truffle-and-solidity-versioning-with-npx-from-npm-51b5fcb0825f
- https://github.com/lgeorges1234/5_Real_Estate_Marketplace_Project
- https://medium.com/@mycoralhealth/advanced-blockchain-concepts-for-beginners-32887202afad
- https://www.youtube.com/watch?v=xYYEJqGTg78
- https://link.medium.com/Ilv4AvrQvtb
- https://github.com/andresaaap/mint-ntf
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