---
id: 5228
title: "Move Smart Contract Arithmetic: How Precision Fails and Economics Break"
source_domain: hackenproof.com
source_url: "https://hackenproof.com/blog/move-smart-contract-arithmetic-precision"
published_at: "2026-06-18 07:43"
tags: ["web3", "smart-contracts", "defi", "sui", "move", "aptos", "arithmetic"]
phying_url: "https://phying.com/item/5228"
lang: en
---

# Move Smart Contract Arithmetic: How Precision Fails and Economics Break

## Summary

Part 3 of the Move series: why arithmetic and precision bugs are the costliest class on Sui/Aptos — the $223M Cetus exploit, overflow gaps around shifts and downcasts, and audit patterns.

## Intelligence Metadata

- **Sources:** hackenproof.com
- **Published:** 2026-06-18 07:43
- **Original:** https://hackenproof.com/blog/move-smart-contract-arithmetic-precision
- **Phying News:** https://phying.com/item/5228