Pi-Based 40-Coin Crypto Wallet

I want to turn a Raspberry Pi 4 into a personal, air-gapped hardware wallet that safely stores and transacts with forty different cryptocurrencies—Bitcoin, Ethereum, Ripple and another thirty-seven assets I will list once we start... (Budget: $30 - $250 USD, Jobs: API Development, Blockchain, C Programming, Cryptocurrency, Documentation, Financial APIs, Linux, PHP, Raspberry Pi, Software Architecture)