Manual Review

A thorough line-by-line review was conducted on the codebase to identify potential malfunctions and vulnerabilities in Tangible's cross-chain LayerZero rebasing token implementation.

As the project at hand implements a LayerZero cross-chain system, intricate care was put into ensuring that the flow of funds within the system conforms to the specifications and restrictions laid forth within the protocol's as well as LayerZero's specifications.

We validated that all state transitions of the system occur within sane criteria and that all rudimentary formulas within the system execute as expected. We pinpointed vulnerabilities relating to EIP-20 conformity within the system as well as potentially improper cross-chain message consumptions which could have had moderate-to-severe ramifications to its overall operation; we urge the Tangible team to promptly remediate them.

Additionally, the system was investigated for any other commonly present attack vectors such as re-entrancy attacks, mathematical truncations, logical flaws and ERC / EIP standard inconsistencies. The documentation of the project was satisfactory to a great extent, containing extensive in-line documentations about the intents and purposes of each function.

A total of 15 findings were identified over the course of the manual review of which 3 findings concerned the behaviour and security of the system. The non-security related findings, such as optimizations, are included in the separate Code Style chapter.

The finding table below enumerates all these security / behavioural findings:

ID	Severity	Addressed	Title
LZR-01M			Incorrect Consumption of Cross-Chain Transfers (Satellite)
RTU-01M			EIP-20 Discrepancy of Rebase-Based System
RTU-02M			Inexistent Support of Rebasing Status