Practical Secure Programming in Solidity

Design secure solidity contracts through deliberate planning, minimal balance, modular reuse of libraries, phased testing, and upgrade paths to mitigate risks from deployment to production.

Learn how smart contracts run on the Ethereum platform, including gas costs, immutability, and the importance of secure coding with OpenZeppelin libraries.

Explore Solidity value types, including integers, unsigned integers, addresses, enums, booleans, and bytes. Learn signed versus unsigned representations, address payable, and core operators like modulus, increment, and assignment.

Explore Solidity reference types, including fixed and dynamic arrays, structs, and mappings. Learn how push, pop, and length manage data, while mappings store key-value pairs securely.

Explore how Open Zeppelin's contracts library and defender platform provide open source security tools to speed up secure smart contract development, with bug bounties, audits, stable APIs, and ongoing versioning.

OpenZeppelin's contracts wizard guides you through building secure, upgradable Solidity contracts with features like access control, pausing, minting, voting, and governance templates, and shows how to import code from GitHub.

Explore Remix as a web-based solidity IDE, connect to a local host, and compile, deploy, and test contracts with gas settings, while learning to import projects from GitHub or IPFS.

Learn to apply OWASP top vulnerabilities to secure Solidity development. Address broken access controls, cryptographic failures, injection, insecure design, and misconfiguration with threat modeling and secure patterns.

Learn to manage vulnerable components and outdated dependencies in blockchain apps by scanning for CVEs, applying patches, using signed packages, and monitoring with logging.

Explore force feeding contracts in Solidity: expose vulnerabilities from balance checks and self-destruct, compare good and bad practices, and learn to use a counter to validate the value.

Ensure secure contract flow by applying the checks effects interaction pattern to prevent reentrancy, verify prerequisites before external calls, and protect state during value transfers.

Learn how to safely implement external calls in Solidity, mark untrusted interfaces, handle errors with low-level calls, avoid reentrancy, prefer call and pull payments, and monitor gas costs.

Explore how Solidity 0.8 prevents overflow and underflow by throwing errors, and how safe math from Open Zeppelin helps handle division by zero and VM errors.

Explore how on-chain data is publicly accessible, enabling wallet and transaction visibility, while hashing, salting, and off-chain storage protect privacy and manage gas costs.

Explore how off-chain data powers decentralized applications, including storage options, oracle types, and data sources like weather, supply chain, and financial feeds, while balancing gas costs and regulatory needs.

Analyze how off-chain data from centralized and decentralized oracles fuels on-chain contracts, and apply robust designs, time-weighted averages, data validation, and incentives to prevent manipulation.

Learn how front running exploits nonpublic mempool data to gain an edge in blockchain trades, from displacement and insertion to suppression, and explore mitigation strategies like commit-reveal and submarine send.

explains how to securely access private and public data in Solidity via external function calls and oracles, including Chainlink integration, private API fees, and data validation.

Secure governance wallets by enforcing only owner access, applying role-based access control and multisig, hash and salt private keys, and auditing dependencies to deter phishing and key compromise.

Real world Raydium admin keys hack demonstrates how stolen keys allowed liquidity pool withdrawals on Solana; emphasizes strong key management, multi-signature safeguards, auditors, and post-attack measures.

Explore governance controls in Solidity contracts, examining voting mechanisms, emergency updates, multi-signature safeguards, and how on-chain and off-chain data support secure DAO decision making.

Self destruct deletes the contract and transfers remaining ether or ERC20 tokens to a specified target, creating exploitable vulnerabilities and contrasting with delegate call for upgrades.

Explore how delegate call executes another contract’s code in the caller’s runtime context, highlighting security risks, storage layout, and upgradeable patterns such as proxies and libraries.

Explore how hash collisions threaten cryptographic security in Solidity, learn how 32-byte hashes and rainbow tables expose vulnerabilities, and apply ABI encode to prevent concatenation-induced collisions.

Explore how to generate secure randomness in Solidity for Ethereum apps, comparing collaborative, block hash, and oracle methods, with caveats about using block data for randomness.

Explains denial of service risks in Solidity contracts, including external manipulation of mappings and arrays, gas costs, key loss, and external calls, with safeguards like pauses and multi-sig ownership.

Explore how tx.origin enables phishing by tricking contract owners into authorizing transactions. Use msg.sender instead to reliably identify who sent the message and prevent attacks.

Discover how malicious code is hidden in solidity contracts, how public ethereum contracts are audited, and how audit reports reveal risks to enable safer code reuse.

Avoid using block timestamps as seeds for randomness in Solidity contracts, especially for time-dependent events, due to the 15-second rule and fork risks.

Explore how contract size and code-size checks distinguish contract versus user wallets in Solidity, their bypass risks, and the 24k size limit driving code reuse.

Explore how signature replay and meta transactions enable bundling and off-chain signing to reduce gas, with safeguards like EIP-712 domain separation and nonces.

Analyze fake tokens that mimic ERC-20 interfaces but alter behavior to study threats today. Apply validation, safe wrappers, and token allow lists to detect unknown tokens and reduce adversarial risk.

Install truffle suite on macOS via homebrew, update brew, and verify truffle, ganache, solidity, node, web3.js, and remix installations.

install the truffle suite on windows by following github guide and installing node.js. resolve the remote-signed execution policy to run truffle and proceed with solidity development using ganache and remix.

Explore VS Code Solidity plugins and extensions, including Solidity, debugger, truffle, ganache, and remix, to configure and streamline secure Solidity development.

Work with remix to build, compile, and test Solidity contracts, inspect build info, and review compiler versions and security considerations for practical secure programming.

Navigate Visual Studio Code for Solidity development, set compiler versions, debug contracts, and deploy with Remix while leveraging Ipfs, diagrams, and optional tools like Docker and Truffle.

Configure your solidity project to place Open Zeppelin modules in your directory so the compiler can locate them, then debug, compile, run static analysis, and test units before deployment.

Adjust VS Code solidity settings to clear open zeppelin errors by emptying the default dependencies and enabling remappings in settings.json.

Learn to check if a wallet is blacklisted using a dedicated isBlacklisted function and the USDC proxy, enabling secure bridge development and preventing money laundering.

Auditing strengthens smart contracts by combining manual and automated reviews, producing vulnerability reports with mitigation advice, assessing risk, and ensuring due diligence to third parties.

Celebrate completing the course and apply fresh ideas to write cleaner smart contracts in solidity, while staying engaged for updates and sharing feedback on security features and the blockchain ecosystem.