Summary
The marker module's ABCI begin block handler performs critical maintenance operations including supply balance checks for active fixed-supply markers that automatically mint or burn coins to maintain configured supply levels, and cleanup of destroyed markers by removing them from the KVStore, with supply imbalances potentially halting the chain if insufficient coins are available for burning.
Supply Checks
Each ABCI begin block call, all markers that are active and have a fixed supply are evaluated to ensure configured supply level matches actual supply levels.
- For markers that have a configured supply exceeding the amount in circulation the difference is minted and placed within the marker account.
- For markers that have a configured supply less than the amount in circulation, an attempt to burn sufficient coin to balance the circulation against the supply will be performed. If the marker does not hold enough coin to perform this action an invariant constraint violation is thrown and the chain will halt.
Destroyed Markers
In addition to supply checks the ABCI begin block call is used to purge markers that have been selected for deletion.
- Markers in the
destroyedstatus are deleted from the KVStore.