Enjin Blockchain “Sentosa” Upgrade

Important

Update (December 8, 2025): The Sentosa Mainnet upgrade window has been rescheduled by 24 hours to December 9, 2025 (Relaychain: 16:30 UTC, approx. block 13,243,426, Matrixchain: 16:45 UTC, approx. block 7,732,995) to allow for additional coordination with infrastructure partners. The Enjin Blockchain continues to operate normally and user funds and assets remain safe.

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Dear Enjineers!

As part of our contracted tasks for the Enjin ecosystem, we are pleased to announce the preparation of the codename “Sentosa” Enjin Blockchain upgrade. 

Upgrade Schedule

The changes will initially be deployed to the Canary Testnet, providing developers and users with a controlled environment to interact with the updates and giving developers sufficient time to update their integrations.

Enjin Relaychain

• Canary Testnet: October 27, 2025 (approximately 16:00 UTC) at block 13054949.
• Relaychain Mainnet: December 8, 2025 (approximately 16:30 UTC) at block 13229687 (tentative).

Enjin Matrixchain

• Canary Testnet: October 27, 2025 (approximately 16:00 UTC) at block 8215650.
• Matrixchain Mainnet: December 8, 2025 (approximately 16:30 UTC) at block 7734855 (tentative).

During the upgrade process, the chain may reject extrinsics. Users are advised to wait for the upgrade to complete before attempting to submit new extrinsics.

Summary

• Coretime integration on Relaychain.
• Introduction of Hyperbridge and asset conversion (dex) pallets.
• Removal of nomination pool bonus cycles.
• Introduction of off-chain workers to handle period tasks such as validator payout and clearing expired marketplace listings.
• Auction bid extension.
• See full changelog below.

Full Changes

Enjin Relaychain 1.6.0

• Transition to coretime.
• Remove nomination pool bonus cycle. Any accrued rewards stored in bonus accounts of existing pools will be immediately released to pool reward account. No action required from pool operators.
• Reduce time required to destroy a pool from 56 days to 28 days.
• Add offchain worker to payout validator staking rewards.
• Handle dust when buying stake exchange offers.
• Prevent listing of Degens in destroying pools on marketplace pallet.
• Remove UnbondingMembers storage when empty in nomination pools.
• Fail when unbonding with zero balance.
• Remove im_online pallet.
• Set fork aware transaction pool as the default.
• Update Rust to 1.84.1
• Update Polkadot sdk to stable2506

Matrixchain 1.3.0

Hyperbridge

• Add Hyperbridge pallet (canary only).

Asset Conversion

• Add asset conversion (dex) pallet (canary only).

Fuel tanks

• Allow fuel tanks to dispatch without existential deposit.
• Allow renaming of fuel tanks.
• Add offchain worker that removes expired fuel tank accounts.
• Use field total_amount in Infused event.
• Allow setting owner when mutating fuel tank.
• Allow fuel tank accounts to expire.
• Add force_insert_rule_set extrinsic.
• Fix fuel tank deposits sometimes reimbursing extra deposit.
• Remove fuel tank max call size limit.
• Allow destroying fuel tanks with accounts.
• Use call indices instead of extrinsic names in fuel tank rules.

Marketplace

• Auction bid extension: Auction bids made 10 minutes prior to auction ending reset the auction timer to 10 minutes. Regardless of extension, the auctioneer may manually select the winning bid after the original end time has been reached.
• Add offchain worker that removes expired listings.

Multi-tokens

• Add batch_infuse extrinsic.
• Add set_token_groups extrinsic.
• Can now add token to token group on token creation.
• Allow burning of frozen tokens.
• Make account_deposit_count optional when minting.

Other

• Update polkadot sdk to stable2506.
• Set fork aware transaction pool as the default.
• Remove depositor params for all pallets.

Notices

Blockchain Developers

• Relaychain: Coretime is introduced. Verify any logic that interacts with scheduler like behavior or resource assignments.
• Relaychain: staking rewards are now paid via an offchain worker.
• Matrixchain: marketplace listing and auction flows are now auto pruned by offchain workers that remove expired listings.

Enjin Platform Developers

• Cloud: No action expected.
• Self-hosted: Self hosted users should plan to refresh chain metadata after runtime rollout, following the same process used in prior upgrades.

Enjin Wallet & NFT.io users

• Transactions may be briefly restricted during each network’s upgrade window.

Node Operators

• Upgrade to the corresponding client tags once published for Relaychain v1.6.0 and Matrixchain v1.3.0. Follow the same node upgrade guides referenced in earlier releases. Upgrading Enjin Relaychain nodes and Enjin Matrixchain nodes.

Exchanges

• Upgrade downtime: Plan maintenance windows for deposits and withdrawals during the upgrade windows. Include sufficient buffers before start and after end.
• Node clients: Please upgrade any nodes to the latest version.
• User deposits: No impact.
• Address generation: No impact.
• Extrinsic creation: No impact.

Versioning

• Relaychain runtime: v1.6.0
• Matrixchain runtime: v1.3.0