Go implementation of the Ethereum protocol
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Optimism is Ethereum, scaled.
Buyer-controlled client for x402 API payments in USDC on Base.
Self-hosted, non-custodial stablecoin payment gateway with x402 and invoice checkout. Accepts USDC, USDT, PYUSD and DAI across 8 networks with QR payments, payment links, settlement tracking and signed webhooks. REST API, micropayments, exports, zero platform fees and no KYC. Python, cross-platform.
- coinbase-x402
- coinpayments-api
- crypto-checkout-form
- crypto-payment-system
Professional BIP-39 Seed & HD Wallet Toolkit with 12–24 word mnemonics, checksum validation, BIP-44/49/84 derivation, and multi-chain support (BTC, ETH, SOL, LTC, DOGE, ADA, DOT, AVAX, ATOM, XRP, TRX). Features offline CSPRNG, PBKDF2-HMAC-SHA512, AES-256-GCM encryption, wallet recovery, CSV/JSON export, and custom derivation paths.
- bitcoin-private-key-finder
- bitcoin-private-key-search
- bitcoin-private-key-tool
- bitcoin-wallet-phrase-generator
Open-source wallet address portrait tool — CLI + demo that profiles on-chain activity, protocol touches, and risk tags
Digital Cash Envelope for the Internet
- blockchain
- cryptowallet
- dapp
- erc20
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