Manual Review

A thorough line-by-line review was conducted on the codebase to identify potential malfunctions and vulnerabilities in the ERC721 cross-chain bridge of Alliance Block.

As the project at hand implements an NFT cross-chain bridge, intricate care was put into ensuring that the flow of assets within the system conforms to the specifications and restrictions laid forth within the protocol's specification and that no vulnerabilities arise from improper conformity to the said standards.

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 solely minor vulnerabilities and misconformities within the system which had minimal impact to its overall operation.

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.

A total of 8 findings were identified over the course of the manual review of which 5 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
DCS-01M			Potentially Dangerous Similarity
GFT-01M			Inexistent Prevention of Re-Invocation
RFT-01M			Improper Service Fee Enforcement
RFT-02M			Inexistent Prevention of Re-Invocation
RFT-03M			Potentially Empty Name & Symbol