--- title: "BIP39 for Developers: Python Code, EVM Contracts and API Keys" url: "https://bip39-phrase.com/topics/developers/" language: "en" --- # BIP39 for Developers: Python Code, EVM Contracts and API Keys Code examples and reference material for people who build on top of wallets and exchanges: generating BIP39 mnemonics in Python, deploying a first smart contract on the EVM, and recognizing and storing the API keys that exchanges and AI providers issue. ## Start here ![Generate a BIP39 Seed Phrase in Python: Code and Test Vectors](/wp-content/uploads/2025/02/seed-phrase-generation-using-python-card.webp) Developers Feb 28, 2025 ## [Generate a BIP39 Seed Phrase in Python: Code and Test Vectors](/seed-phrase-generation-using-python/) ![Smart Contract EVM: What It Is and How It Works](/wp-content/uploads/2024/06/smart-contract-evm-what-it-is-and-how-it-works-card.webp) Developers Mar 13, 2025 ## [Smart Contract EVM: What It Is and How It Works](/smart-contract-evm-what-it-is-and-how-it-works/) ## More in Developers - [OpenAI API Key Format: sk-proj, sk-svcacct and sk-admin](/openai-api-key-format/) An OpenAI API key starts with sk-proj- (project), sk-svcacct- (service account) or sk-admin- (admin) and is sent as a bearer token. How to check and store one. - [Anthropic API Key Format (sk-ant-api03): Anatomy & Security](/anthropic-api-key-format/) An Anthropic API key starts with sk-ant-, classically sk-ant-api03-, and is about 108 characters long. How to create, check, store and rotate one safely. - [API Keys of Major Cryptocurrency Exchanges: Examples & Uses](/api-keys-popular-exchanges/) An exchange API key pairs a public key with a secret that signs requests. Formats and signing for Binance, Coinbase, Kraken, Bitfinex and HTX, plus safety tips. ## Tools - [Seed phrase to private key converter](/seed-phrase-to-private-key-converter/) ## PDF documents on this topic All 53 printable explainers on this topic, including the [PDF archive](/list-phrase/), newest first. - [The Ethereum Merge: What Changed and What It Means](/list-phrase/the-ethereum-merge-what-changed-and-what-it-2026-10-01/) · October 1, 2026 The Ethereum Merge in September 2022 switched the network from proof-of-work to proof-of-stake, cutting energy use by 99.95% and reducing ETH issuance. - [How to Optimize Ethereum Gas Fees](/list-phrase/how-to-optimize-ethereum-gas-fees-2026-09-14/) · September 14, 2026 A practical guide to reducing Ethereum transaction costs through timing, manual fee settings, Layer 2 networks, and smart contract optimization. - [Dynamic NFTs: How They Work and Where They Are Used](/list-phrase/dynamic-nfts-how-they-work-and-where-they-2026-09-13/) · September 13, 2026 Dynamic NFTs update their metadata in response to real-world data or on-chain events, enabling use cases in sports, gaming, identity, and finance. - [Fractional Ownership of NFTs: How It Works](/list-phrase/fractional-ownership-of-nfts-how-it-works-2026-09-11/) · September 11, 2026 Fractional NFT ownership splits high-value tokens into tradable shares, improving liquidity while raising legal and governance challenges. - [Soulbound Tokens and Digital Identity](/list-phrase/soulbound-tokens-and-digital-identity-2026-08-31/) · August 31, 2026 Soulbound tokens are non-transferable blockchain tokens designed to represent persistent identity attributes, with real promise and unsolved problems in privacy and key management. - [Account Abstraction in Ethereum: How ERC-4337 Works](/list-phrase/account-abstraction-in-ethereum-how-erc-4337-works-2026-08-28/) · August 28, 2026 ERC-4337 enables programmable Ethereum accounts via UserOperations, bundlers, and Paymasters without changing the base protocol. - [EIP-1559 and Ethereum Fee Burning Explained](/list-phrase/eip-1559-and-ethereum-fee-burning-explained-2026-08-09/) · August 9, 2026 EIP-1559 replaced Ethereum's fee auction with a protocol-set base fee that is burned each block, reducing ETH supply over time. - [Sharding and the Ethereum Roadmap](/list-phrase/sharding-and-the-ethereum-roadmap-2026-07-21/) · July 21, 2026 Ethereum's sharding roadmap has shifted from execution sharding to Danksharding, focusing on blob data availability to scale rollups efficiently. - [Blockchain Oracles and Chainlink: Connecting Chains to the Real World](/list-phrase/blockchain-oracles-and-chainlink-connecting-chains-to-the-2026-07-18/) · July 18, 2026 Blockchain oracles bridge smart contracts and external data, with Chainlink leading through decentralized node networks, price feeds, and cross-chain tools. - [Borrowing Against Your NFT Collection: Unlocking Liquidity in the Digital Age](/list-phrase/borrowing-against-your-nft-collection-unlocking-liquidity-in-2026-06-26/) · June 26, 2026 Borrowing against your NFT collection enables holders to unlock liquidity by using their digital assets as collateral while navigating unique risks and opportunities. - [MEV: Maximal Extractable Value Explained](/list-phrase/mev-maximal-extractable-value-explained-2026-06-11/) · June 11, 2026 MEV, or maximal extractable value, is the profit blockchain validators can earn by manipulating transaction order, significantly impacting blockchain fairness and efficiency. - [The Intersection of AI and Cryptocurrency: Transforming the Digital Economy](/list-phrase/the-intersection-of-ai-and-cryptocurrency-transforming-the-2026-06-07/) · June 7, 2026 AI and cryptocurrency are converging to revolutionize digital finance by enhancing trading, security, and automation, despite ongoing challenges in transparency and ethics. - [Exploring the Cosmos Ecosystem and the Power of the IBC Protocol](/list-phrase/exploring-the-cosmos-ecosystem-and-the-power-of-2026-06-06/) · June 6, 2026 The Cosmos ecosystem and its IBC protocol are revolutionizing blockchain interoperability, enabling seamless asset and data transfers across a diverse, interconnected network of blockchains. - [The Ongoing Debate Over NFT Royalties](/list-phrase/the-ongoing-debate-over-nft-royalties-2026-06-01/) · June 1, 2026 The NFT industry is grappling with how to balance creator royalties and open market principles, sparking ongoing debate and experimentation throughout the ecosystem. - [Understanding Uniswap V3 and Concentrated Liquidity](/list-phrase/understanding-uniswap-v3-and-concentrated-liquidity-2026-05-29/) · May 29, 2026 Uniswap V3's concentrated liquidity feature revolutionizes decentralized exchanges by enabling more efficient capital allocation and higher yields for liquidity providers. - [Optimistic Rollups vs ZK-rollups: Comparing Layer 2 Solutions for Blockchain Scalability](/list-phrase/optimistic-rollups-vs-zk-rollups-comparing-layer-2-2026-05-22/) · May 22, 2026 Optimistic rollups and ZK-rollups are leading Layer 2 solutions that differ in their approach to validating transactions, balancing trade-offs between speed, security, and compatibility for blockchain scalability. - [How NFTs Are Transforming the Music Industry](/list-phrase/how-nfts-are-transforming-the-music-industry-2026-05-19/) · May 19, 2026 NFTs are revolutionizing the music industry by providing artists with new revenue streams, direct fan engagement, and greater control over their work. - [Flash Loans in DeFi: Risks and Rewards](/list-phrase/flash-loans-in-defi-risks-and-rewards-2026-05-16/) · May 16, 2026 Flash loans in DeFi offer unprecedented capital access and arbitrage opportunities but pose significant security risks through smart contract exploits and… - [Web3 and the Future of the Internet](/list-phrase/web3-and-the-future-of-the-internet-2026-05-06/) · May 6, 2026 Web3 aims to reshape the internet by replacing centralized platforms with blockchain-based systems that give users control over their own data, identity, and… - [Introduction to Yield Farming in DeFi](/list-phrase/introduction-to-yield-farming-in-defi-2026-04-29/) · April 29, 2026 Yield farming in DeFi allows cryptocurrency holders to earn rewards by providing liquidity to decentralized protocols, offering high potential returns… - [The Decentralized Finance (DeFi) Ecosystem](/list-phrase/the-decentralized-finance-defi-ecosystem-revolutionizing-traditional-banking-2026-04-14/) · April 14, 2026 The DeFi ecosystem is revolutionizing finance by creating open, permissionless financial services on blockchain networks, offering global accessibility and… - [The Rise of Play-to-Earn Crypto Games](/list-phrase/the-rise-of-play-to-earn-crypto-games-2026-04-13/) · April 13, 2026 Play-to-earn crypto games are revolutionizing the gaming industry by allowing players to earn real income through blockchain-based rewards, creating new… - [Zero-Knowledge Proofs and Privacy Coins](/list-phrase/zero-knowledge-proofs-and-privacy-coins-revolutionizing-financial-2026-04-12/) · April 12, 2026 Zero-knowledge proofs enable privacy coins to provide completely confidential transactions while maintaining mathematical verifiability, revolutionizing… - [Cross-chain Bridges: Connecting Blockchains](/list-phrase/cross-chain-bridges-connecting-blockchains-2026-04-07/) · April 7, 2026 Cross-chain bridges are essential protocols that enable secure asset transfers and communication between different blockchain networks, facilitating… - [How Crypto Lending Platforms Operate: A Comprehensive Guide](/list-phrase/how-crypto-lending-platforms-operate-a-comprehensive-guide-2026-04-06/) · April 6, 2026 Crypto lending platforms connect borrowers and lenders through centralized or decentralized systems, using collateralization and algorithmic interest rates to… - [A Comprehensive Guide to NFTs](/list-phrase/a-comprehensive-guide-to-nfts-2026-04-03/) · April 3, 2026 This article explores the fundamentals, benefits, and challenges of NFTs, offering a detailed overview of their role in digital ownership and the creative… - [Understanding Layer 2 Scaling Solutions](/list-phrase/understanding-layer-2-scaling-solutions-2026-04-02/) · April 2, 2026 Layer 2 scaling solutions improve blockchain scalability by processing transactions off-chain, enhancing speed and reducing costs without sacrificing security. - [What Is Token Gating](/list-phrase/what-is-token-gating-2026-03-08/) · March 8, 2026 Token-gating is a way Web3 communities can create value for their community by giving holders access to exclusive content, events, and other benefits. - [What Are CryptoPunks](/list-phrase/what-are-cryptopunks-2026-03-05/) · March 5, 2026 The CryptoPunks NFT collection was an experiment by Matt Hall and John Watkinson — developers at the mobile app development company Larva Labs. - [Solana vs Cardano](/list-phrase/solana-vs-cardano-2026-02-23/) · February 23, 2026 Cardano is a blockchain built to solve problems that earlier networks like Bitcoin and Ethereum couldn't; namely, how to make a programmable blockchain that… - [The Ultimate NFT Toolkit](/list-phrase/the-ultimate-nft-toolkit-2026-02-18/) · February 18, 2026 It’s time! You’ve been thinking about it for months and finally, you’re charged and ready to buy your first NFT! - [What is Wilder World?](/list-phrase/what-is-wilder-world-2026-02-17/) · February 17, 2026 Frank Wilder is the enigmatic artist who made his name as a real-world sculptor and jewelry designer. - [Sui vs Solana](/list-phrase/sui-vs-solana-2026-01-20/) · January 20, 2026 Newer blockchains often emerge purporting to offer better user experiences, functionalities, and fewer limitations than their predecessors, all vying for… - [5 Years of Solana](/list-phrase/5-years-solana-2026-01-10/) · January 10, 2026 The story of Solana begins in November 2017, when former Qualcomm and Dropbox engineer, Anatoly Yakovenko, published a whitepaper describing a new method of… - [What is Zama](/list-phrase/what-is-zama-2025-12-21/) · December 21, 2025 Zama is the first $1B unicorn open-source cryptography company aiming to make fully homomorphic encryption practical. - [DAO Guide](/list-phrase/dao-guide-2025-12-17/) · December 17, 2025 Blockchain technology is innovative and exciting; at its core lies a decentralized system that operates without a central authority. - [Spot Ethereum ETFs](/list-phrase/spot-ethereum-etfs-2025-12-14/) · December 14, 2025 ETFs have been one of the most important instruments to cross over from traditional finance (TradFi) into crypto. - [What is x402](/list-phrase/what-is-x402-2025-12-11/) · December 11, 2025 The internet economy has always struggled with payments. Traditional rails like credit cards and bank transfers were built for a physical world, and… - [ERC-404 Tokens](/list-phrase/erc-404-tokens-2025-11-30/) · November 30, 2025 ERC-404 is an experimental protocol that brings fungibility to non-fungible tokens by combining aspects of ERC-721 and ERC-20 tokens. - [Solana Token Creator](/list-phrase/solana-token-creator-2025-11-24/) · November 24, 2025 Contrary to popular general public belief, creating your own crypto token isn't an exclusive privilege of blockchain developers with significant technical… - [Solana vs Ethereum](/list-phrase/solana-vs-ethereum-2025-11-22/) · November 22, 2025 The blockchain arena features two prominent platforms, Ethereum and Solana, each with distinct architectural philosophies. - [What Is LayerZero](/list-phrase/what-is-layerzero-bip39-phrase-2025-11-17/) · November 17, 2025 LayerZero is built on the concept of unified cross-chain development, otherwise expressed through the term “omnichain”. - [The Ethereum Pectra Upgrade](/list-phrase/ethereum-pectra-upgrade-bip39-phrase-2025-11-16/) · November 16, 2025 As the pioneering network for smart contracts, Ethereum continuously evolves to meet new challenges. - [What is Infura](/list-phrase/what-is-infura-bip39-phrase-2025-11-12/) · November 12, 2025 Have you ever stopped to ask what’s behind Web3? You should, it’s important! - [What Is a Sidechain](/list-phrase/what-is-sidechain-bip39-phrase-2025-11-11/) · November 11, 2025 What do you do when you’re stuck in traffic along a highway? - [What is Celestia (TIA)](/list-phrase/what-is-celestia-bip39-phrase-2025-11-10/) · November 10, 2025 Many will be familiar with the blockchain trilemma, as first coined by Ethereum co-founder Vitalik Buterin. - [The SPL Ecosystem](/list-phrase/spl-ecosystem-bip39-phrase-2025-11-09/) · November 9, 2025 Second only to Ethereum in total value locked (TVL), Solana is a high-performance, layer-1 blockchain known for its fast transaction times and low costs. - [Danksharding and Proto-danksharding Explained](/list-phrase/danksharding-bip39-phrase-2025-11-07/) · November 7, 2025 If you know anything about the Ethereum network, you probably know that it’s the hub for decentralized applications (dApps) accessible through an… - [Investment DAOs](/list-phrase/investment-dao-bip39-phrase-2025-11-06/) · November 6, 2025 Well, in the world today, you have the big fish and the little fish; and everyone’s trying to “make it” . - [What Is Ethereum Restaking](/list-phrase/eth-restaking-bip39-phrase-2025-10-26/) · October 26, 2025 The clearest benefit of restaking Ether is that it compounds rewards for stakers. - [Web3 Explained](/list-phrase/web3-bip39-phrase-2025-10-22/) · October 22, 2025 Web3 represents the next evolution of the internet — a decentralized ecosystem where users have control over their data, identity, and digital assets. - [Web3 and Altcoins](/list-phrase/web3-altcoins-bip39-phrase-2025-10-12/) · October 12, 2025 Web3 is the next iteration of the internet where users, not platforms, own data and value. - [What Is Arbitrum](/list-phrase/what-is-arbitrum-2025-01-27/) · January 27, 2025 While the Ethereum network is the smart contract network of choice for many, it can be slow and expensive at specific times and for certain uses.