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Description of bug

Description:

When analyzing the local chain specification file, it is observed that the entry genesis/raw/top/0x3a636f6465 takes up a significant portion of the file. This raises a few questions:

1. Purpose of the Entry:
   What specific role does the genesis/raw/top/0x3a636f6465 entry serve within the genesis configuration?

2. Size Discrepancy:
   Why is the size of this entry disproportionately large compared to the rest of the genesis configuration?

3. Genesis Block Scope:
   Shouldn't the genesis entry represent the entire genesis block, rather than focusing on just genesis/raw/top/0x3a636f6465?

A priori, there seems to be no clear justification for why this entry alone is so large in comparison to the rest of the file.

Steps to reproduce

1. Generate a local chain spec.
2. Open the JSON file and examine the genesis/raw/top section.
3. Compare the size of the 0x3a636f6465 entry to the rest of the genesis block.

Expected Behavior:

The size of genesis/raw/top/0x3a636f6465 should have a clear and well-documented explanation. If the size is unnecessarily large, optimizations should be considered.

Additional Context:

This issue was raised during an internal review of the local chain spec file for a custom Substrate-based blockchain. Further investigation is required to determine whether this is expected behavior or an anomaly.