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Issue Summary

Description
PositionTokens violates one of the MUST rules defined in EIP-1155.
The rule states:
The URI MUST point to a JSON file that conforms to the ERC-1155 Metadata URI JSON Schema.
However, in the current implementation, the URI is set to an empty string, violating this requirement.
Alpha: on Sherlock, this doesn't always apply, and may be low. Read the readme to make sure, just like in this contest.
Additionally, the sponsor’s README explicitly states that violations of MUST EIP rules should be considered medium severity issues.
Conclusion
$720 for this finding is super juicy, but always read the readme! It must say something like this:
