Enable Cosmos Module Events to be Indexed by EVM Indexers

[djm07073]

Problem

Currently, when Cosmos SDK modules emit events, these events are not visible to EVM-side indexers and explorers because they don't emit EventTypeEthereumTx events. This creates a tracking gap for important state changes that involve fund movements.

Examples

Staking Module:

• When unbonding occurs, funds are transferred but the transaction is not trackable in EVM explorers
• When rewards are claimed, the fund movement is invisible to EVM indexers

Impact: Users and applications relying on EVM explorers (Etherscan-like tools) cannot track these important transactions, leading to incomplete transaction history.

[linear]

EVM-433

[vladjdk]

Hi, we currently do not support this, but it is a problem that is worth solving. Feel free to open a PR and we'll support with a review.

[djm07073]

@vladjdk I’m currently thinking about how this could be implemented without modifying the core logic, only evm indexer. I’ll explore possible approaches and open a PR once I have a workable solution.