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Arbitrum Sepolia Testnet Halts Block Production in Partial Outage

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Arbitrum Sepolia, the primary testnet for the leading Ethereum Layer-2, has stopped block production. The network suffered a critical consensus failure at block 204606366, causing a chain split between node operators using different CPU architectures.

Developers relying on the testnet for pre-deployment validation are currently stalled as Offchain Labs engineers deploy emergency fixes.

Key Takeaways:
  • Consensus Failure: The chain halted at block 204606366, triggering a major outage that disrupted the network from 6:44 AM to 9:02 PM.
  • Hardware Split: The breakdown was caused by a rare execution deviation where ARM and x86 processors produced conflicting block results.
  • Operator Action: Node runners must currently restart with safety verification flags disabled or migrate entirely to x86 hardware to sync.

Why Did the Arbitrum Sepolia Nodes Split?

The outage is technical, specific, and severe. At block 204606366, the Arbitrum Sepolia sequencer produced a batch that processed differently depending on the validating node’s hardware. Nodes running on ARM architecture calculated a different state root than those on x86 chips, effectively splitting the network’s brain. This deviation forced a halt to block production, as the chain could not reach consensus on a valid path forward.

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Offchain Labs identified the issue as a major outage. While mainnet operations remain unaffected, this incident highlights the fragility of heterogeneous hardware environments in decentralized networks. To resume syncing, node operators on version 3.8.0 must restart with the flag --node.feed.input.verify.dangerous.accept-missing, a command that explicitly bypasses standard input verification protocols. This is a stopgap, not a solution.

Testnets are designed to break so mainnets do not, but reliability on Arbitrum Sepolia has become a recurring friction point. Since the deprecation of the Goerli testnet in March 2024, Sepolia has served as the critical staging ground for dApps before they launch on the main Ethereum Layer-2 network. Frequent downtime here translates directly to delayed mainnet deployments and stalled audit timelines.

This is not an isolated event. The network faced similar stability challenges in August. While other protocols execute smooth, planned infrastructure updates—such as the recent Tellor Palmito testnet upgrade—Arbitrum’s unexpected halts force developers into reactive maintenance.

For institutional players building on Arbitrum, the requirement to swap hardware architectures mid-development to maintain a sync is a red flag for infrastructure maturity. The ecosystem needs stability, not just throughput.

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What to Watch: The Path to Resolution

Offchain Labs has not yet released a permanent patch for the ARM/x86 deviation. At press time, the recommended fix requires manual intervention from every node operator. The team has announced plans for a new Nitro version update and a fresh database snapshot to resolve the compatibility issues fully.

Traders and developers should monitor the official status page for the release of the new snapshot. Until a verified patch confirms cross-architecture consistency, the testnet remains in a fragile state. If the fix lags, deployment schedules across the Arbitrum Orbit ecosystem will slide.

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The post Arbitrum Sepolia Testnet Halts Block Production in Partial Outage appeared first on Cryptonews.

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Crypto World

21shares Says Active Products Are Next Phase for Crypto ETPs

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21shares Says Active Products Are Next Phase for Crypto ETPs

Crypto asset manager 21shares sees actively managed exchange-traded products as the next phase of crypto investing, as the market matures beyond simple price-tracking funds.

Duncan Moir, president of 21shares, told Cointelegraph in an exclusive interview that because crypto is a nascent and growing asset class, it is particularly well suited to active management.

He said the company combines bottom-up research on individual assets with quantitative and discretionary top-down strategies to manage risk and position portfolios, adding that 21shares has been expanding its portfolio management and trading teams to support more sophisticated products.

We’ve had to hire and build out the team with people who have different trading and portfolio management expertise, but now we have a solid team and we think we’ll be able to deliver strong actively managed products.

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Active ETFs worldwide held nearly $1.8 trillion in assets at the end of 2025, according to data compiled by Morningstar and Goldman Sachs Asset Management.

Moir added that integration with FalconX, which acquired 21shares in October, is expected to accelerate product development, particularly as the company expands into more complex offerings.

Demand for crypto ETPs and ETFs varies by region, Moir told Cointelegraph. He said: 

The interest is still concentrated in the larger coins in the US. In Europe, institutional clients are more interested in newer assets and the application layer beyond the layer-1s.

He attributed the divergence to a more mature investor base in Europe, where institutions that already hold Bitcoin (BTC) and Ether (ETH) are increasingly looking to expand their crypto allocations. 

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Against that backdrop, 21shares recently launched an exchange-traded product in Europe linked to Strategy’s preferred stock (STRC), offering exposure to a high-yield instrument linked to the company’s Bitcoin-focused capital strategy. 

Moir said the product has seen strong early demand across multiple regions, reflecting investor appetite for yield-generating assets that are easier to access through traditional brokerage platforms.

Related: Crypto ETF inflows slow to $230M as Fed caution dents momentum: CoinShares

Crypto ETPs evolve beyond passive exposure

As the crypto ETP and ETF market matures, issuers are moving beyond simple price tracking, with more complex structures emerging across the US and Europe.

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One area gaining traction is staking, a process that allows investors to earn yield by locking up crypto assets to help secure blockchain networks. In October, Grayscale introduced staking across its ETPs, making its Ether funds the first US-listed spot crypto ETFs to offer staking rewards while extending the feature to its Solana trust pending ETP approval.

In March, asset manager BlackRock launched a Nasdaq-listed Ethereum product that incorporates staking, combining spot Ether exposure with yield generation. The fund recorded $15.5 million in trading volume on its first day.