Solidity pragma should be specific, not wide

Description

• Solidity pragma versions should be as specific as possible to ensure consistent compiler behavior across different environments. Using a wide version range (^) allows multiple compiler versions to be used.

• The current implementation uses a wide version range (^0.8.20), which could lead to:

  • Unexpected behavior if different compiler versions are used

  • Potential security issues if newer compiler versions introduce breaking changes

  • Inconsistent verification results across platforms

Risk

Likelihood:

• Different team members or deployment environments may use different compiler versions

• Future compiler versions may introduce unexpected behavior

Impact:

• Potential inconsistencies in contract behavior

• Verification challenges across different platforms

• Possible introduction of undetected vulnerabilities

Proof of Concept

1. Developer A installs latest Solidity (0.8.25) which satisfies ^0.8.20

2. Developer B uses pinned version (0.8.20)

3. CI system uses 0.8.22 (latest in its package cache)

4. All compile successfully but produce different bytecode:

Recommended Mitigation

Additional recommendations:

1. Document compiler version in README.md