TON Blockchain: Tolk vs FunC Security Comparison

Introduction

TON blockchain has introduced Tolk as a modern alternative to FunC. This analysis compares the security implications of both languages for smart contract development.

Language Comparison

Feature	FunC	Tolk
`Type Safety`	Weak	Strong
`Memory Safety`	Manual	Automatic
`Error Handling`	Basic	Advanced
`Developer Experience`	Low-level	High-level

Security Implications

Tolk's improved type system catches many vulnerabilities at compile time that would only be discovered at runtime with FunC.

func_example.fc

;; FunC - Type confusion possible
() recv_internal(slice in_msg_body) impure {
    int value = in_msg_body~load_uint(64);
    ;; No compile-time check if 64 bits is correct
}

Type Safety

Tolk prevents many common FunC vulnerabilities

Migration

Consider migrating existing FunC contracts

Audit Focus

FunC contracts need more rigorous auditing