Fintech on Go: what the language solves in a crypto backend (Part 1)
Felipe Ascari
A two-part case study on building an ERC-20 rewards service in Go, covering goroutines, replicas, and the consistency problems that surface before a transaction is signed. Part 1 tackles nonce sequencing and idempotency. TL;DR A crypto payments backend holds state in two systems that disagree often: Postgres and the Ethereum chain. Consistency breaks at three points in an ERC-20 (Ethereum's fungible token standard) transfer. Before the broadcast, the nonce must be ordered correctly. After the br