Remove RadiumBlock from the Astar invulnerable collator set

This referendum proposes removing the collator W5UDvLQnfDRCcNS9Aj8pa96c3chgsd83B3wPsmnGZXKeE2R from the Astar invulnerable set. RadiumBlock has notified the ecosystem that it is discontinuing its public RPC service for Astar and Shiden. Its node held a bond-free invulnerable slot as part of that infrastructure relationship, and with the RPC contribution ending, the basis for the slot no longer applies.

Action: RemoveInvulnerable(W5UDvLQnfDRCcNS9Aj8pa96c3chgsd83B3wPsmnGZXKeE2R)

Preimage hash: 0x055e5e9e88f1c009d14d0ccdb7132cc2885671b9f1bd52f3639a148475f6e539

This is a governance-only change; no client upgrade is required.

🔧 Technical Details

Purpose & Context

RadiumBlock is discontinuing its public RPC for Astar and Shiden (notified 2026-06-01), ending the infrastructure contribution its bond-free invulnerable slot was tied to.
The invulnerable set is a permissioned, bond-free collator tier the Astar Collective maintains for partners providing material infrastructure. Removing this node keeps the set aligned with active contribution.
RadiumBlock has acknowledged the change and may return at any time as a self-bonded collator (3,200,000 ASTR).
Collator address: W5UDvLQnfDRCcNS9Aj8pa96c3chgsd83B3wPsmnGZXKeE2R

Key Technical Change
Execute extrinsic:
CollatorSelection.remove_invulnerable(W5UDvLQnfDRCcNS9Aj8pa96c3chgsd83B3wPsmnGZXKeE2R)

📊 Impact Analysis

Expected Impact

No liveness impact expected; remaining invulnerable and candidate collators continue block production.
RadiumBlock continues authoring and earning rewards until enactment.

Risks & Considerations

⚠️ No client change; operational monitoring recommended post-removal.
If RadiumBlock intends to keep collating, it should bond and apply as a self-bonded collator before enactment to avoid an authoring gap.

Companion action (Shiden)
RadiumBlock's Shiden collator (a58QztZ7M6jrpq5Gf4t7yM5y2syBA17HBKHXNMgGojRLx2x) is removed from the Shiden invulnerable set via sudo call, executed at the same time this referendum concludes.

📚 Additional Resources

Forum discussion: https://forum.astar.network/t/collator-set-removing-radiumblock-from-the-astar-and-shiden-invulnerable-set-following-rpc-discontinuation/9510
Subscan collator page: https://astar.subscan.io/account/W5UDvLQnfDRCcNS9Aj8pa96c3chgsd83B3wPsmnGZXKeE2R

Vote AYE to approve the removal, NAY to reject.