During December 2025, mysticryuujin enhanced the erigon repository by aligning the DataColumnSidecar API and improving event streaming capabilities. They focused on backend and API development using Go, updating the REST endpoints to match official beacon API specifications and ensuring the index is returned as a string for consistency. Their work included augmenting SSE event payloads with block_root and slot fields, which improved event correlation and brought the implementation in line with Lighthouse and Nimbus behaviors. By resolving a Caplin integration issue and achieving REST/Swagger parity, mysticryuujin improved cross-project reliability and reduced integration friction for downstream services relying on erigon.