Enhance Metadata Update for Item Assets: Point Genesis Hash to Input Transaction Hash

[Sophie-Ag00001]

PR Description

Summary of Changes

This PR implements a mechanism to update the metadata field in transactions involving item asset types. Now, when users make changes to an item's metadata, the genesis hash of the asset will point to the transaction hash of the current transaction instead of the original genesis hash. Validation logic has been updated accordingly to enforce this new constraint.

Background

The ability to update metadata for item assets is crucial for tracking changes and ensuring data accuracy. The changes made in this PR ensure that the asset's genesis hash aligns with the most recent transaction, thereby improving the integrity of metadata updates without altering the structure of existing data models.

Testing Instructions

To test these changes:

1. Create a new transaction involving an item asset.
2. Update the metadata for the item.
3. Verify that the genesis hash of the asset points to the transaction hash of the input transaction.
4. Attempt to validate the transaction, ensuring that the new validation logic rejects any misuse of the genesis hash.

Known Issues or Limitations

No known issues at this time. All struct fields remain unchanged to maintain backward compatibility. However, further testing may be required to ensure all edge cases are handled correctly.

Additional Notes

Please refer to the updated validation rules in the documentation for further details on the transaction validation process.