The capstone will build upon the knowledge gained in the Udacity Blockchain course in order to build a decentralized housing product. This is a ERC721 token used to verify ownership of a property. zk-SNARKs is used to create a verification system which can prove that you are the owner of a title to the property without revealing specifics of the property. The tokens can then be placed in a blockchain marketplace (https://opensea.io) for sale.

• Clone the project
• npm install
• start ganache gui (https://www.trufflesuite.com/ganache)
• cd ./eth-contracts
• truffle compile

• cd ./eth-contracts
• truffle test (All 11 tests should pass)

• cd ./eth-contracts
• truffle migrate --network rinkeby --reset

• export OWNER_ADDRESS="<my_address>"
• export CONTRACT_ADDRESS="<deployed_contract_address>"
• export MNEMONIC="<wallet_seed>"
• export INFURA_KEY="<infura_key>"
• node scripts/mint.js

Network name: 'rinkeby' Network id: 4 Block gas limit: 10000000 (0x989680)

transaction hash: 0x8f269b1aa1630e55d6b7ff3b59dcab2e0bef6f081b45db95793db1ede60d320d Blocks: 0 Seconds: 0 contract address: 0x1cDEF4F90f5FED3A9D07911Ea32507DF4d48AF67 block number: 8166259 block timestamp: 1614723597 account: 0x320eAff365D72c2DD5c052E927d0A619D63099f0 balance: 7.716501923 gas used: 225237 (0x36fd5) gas price: 10 gwei value sent: 0 ETH total cost: 0.00225237 ETH

Saving migration to chain. Saving artifacts

Total cost: 0.00225237 ETH

transaction hash: 0x5621ace82666810c55731b055a5773c78539a497e2e72ef05c30a5a678bc595f Blocks: 1 Seconds: 12 contract address: 0x42bA5611DB8BE71Ae85b47B2a04033BEAa4B32C7 block number: 8166261 block timestamp: 1614723627 account: 0x320eAff365D72c2DD5c052E927d0A619D63099f0 balance: 7.688445373 gas used: 2763292 (0x2a2a1c) gas price: 10 gwei value sent: 0 ETH total cost: 0.02763292 ETH

transaction hash: 0x578a5d5b446729b0068c9335de2e1637ed3a95b075d6755b35ac810f361c5276 Blocks: 0 Seconds: 8 contract address: 0xCcaC16961C85ED23bc601c790BE7800BfFed1C31 block number: 8166262 block timestamp: 1614723642 account: 0x320eAff365D72c2DD5c052E927d0A619D63099f0 balance: 7.678769063 gas used: 967631 (0xec3cf) gas price: 10 gwei value sent: 0 ETH total cost: 0.00967631 ETH

transaction hash: 0x176cb27900e007a0ae50b7889f15fccbbe904085b900ab64d68bf775d52a9191 Blocks: 1 Seconds: 12 contract address: 0x8bD86F7F44F7edDFE9154cC32bD616302140bEA9 block number: 8166263 block timestamp: 1614723657 account: 0x320eAff365D72c2DD5c052E927d0A619D63099f0 balance: 7.635769993 gas used: 4299907 (0x419c83) gas price: 10 gwei value sent: 0 ETH total cost: 0.04299907 ETH

Saving migration to chain. Saving artifacts

Total cost: 0.0803083 ETH

Total deployments: 4 Final cost: 0.08256067 ETH

• ERC721Mintable: https://rinkeby.etherscan.io/address/0x42bA5611DB8BE71Ae85b47B2a04033BEAa4B32C7
• Verifier: https://rinkeby.etherscan.io/address/0xCcaC16961C85ED23bc601c790BE7800BfFed1C31
• SolnSquareVerifier: https://rinkeby.etherscan.io/address/0x8bD86F7F44F7edDFE9154cC32bD616302140bEA9
• 10 Minted Tokens: https://rinkeby.etherscan.io/token/0x8bD86F7F44F7edDFE9154cC32bD616302140bEA9
• Opensea Storefront: https://testnets.opensea.io/collection/capstone-token-v2
• Opensea Activity: https://testnets.opensea.io/activity/capstone-token-v2

• Remix - Solidity IDE
• Visual Studio Code
• Truffle Framework
• Ganache - One Click Blockchain
• Open Zeppelin
• Interactive zero knowledge 3-colorability demonstration
• Docker
• ZoKrates