GovernanceCrypto

SEACAST: fast, lean broadcast for Ethereum, with an executable spec and a formal model

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Briefings

SEACAST is a new broadcast protocol for Ethereum designed to handle large object payloads efficiently. It builds on Informed Diffusion principles, using segmented, encoded, and availability-sampled delivery to reduce latency and bandwidth usage compared to gossipsub. The protocol includes an executable specification and a formal model validating safety rules. Performance tests show SEACAST is significantly faster and uses less bandwidth than gossipsub and ECBroadcast on simulated networks.

Key points

• SEACAST is a protocol for Ethereum that delivers large object payloads faster and with less bandwidth than gossipsub.
• SEACAST uses segmented, encoded, and availability-sampled delivery to reduce latency and bandwidth usage compared to gossipsub.

Context

This article describes SEACAST, a protocol for Ethereum designed to handle large object payloads efficiently. It builds on Informed Diffusion principles, using segmented, encoded, and availability-sampled delivery to reduce latency and bandwidth usage compared to gossipsub. The protocol includes an executable specification and a formal model validating safety rules.

Limitations

The formal model is a first version and not exhaustive, with gaps in delivery, promise handling, and expiry. Performance data comes from simulated networks and may not reflect real-world conditions. The protocol is still in development with ongoing implementation and comparison work.

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