Ether.​fi Cash Card Migrates to OP Mainnet with 300K Accounts

Optimism has deployed a new **stake-based transaction ordering system** on OP Mainnet, marking the first of several planned sequencer experiments. **How it works:** - Users who stake 100k OP tokens gain top-of-block transaction access - All stakers receive equal priority within their tier - Transactions are ordered strictly first-in, first-out (FIFO) within each tier The system launched on Sepolia testnet first, with mainnet deployment following the publication of testnet findings. Full technical documentation, governance proposals, smart contract code, and security audit reports are now available. This experiment represents Optimism's approach to exploring alternative sequencer mechanisms while maintaining network stability and fairness. [Read the full breakdown](https://www.optimism.io/blog/stake-based-transaction-ordering-a-new-experiment-on-op-mainnet) | [Technical docs](https://docs.optimism.io/notices/stake-based-priority-ordering)

**OP Mainnet is actively listening to community input regarding Ether.fi's upcoming integration.** The Ethereum scaling solution has acknowledged significant community discussion about bringing Ether.fi to its network. In a thread, OP Mainnet emphasized their commitment to hearing user concerns and feedback. This follows previous statements highlighting Ether.fi's "real utility" and strong performance metrics. The integration appears to be moving forward with community engagement as a priority. **Key Points:** - Community feedback is being actively collected and considered - Ether.fi integration with OP Mainnet is in progress - OP Mainnet emphasizes transparency in the onboarding process

Mitsui & Co.'s subsidiary, Mitsui Digital Commodities (MDC), has launched **Zipangcoin** on OP Mainnet - marking the first cryptoasset from a Japanese company on the network. **Key Details:** - Zipangcoin is backed by physical commodities: gold, silver, and platinum - The token will be listed on GMO Coin exchange on April 20 - Represents a significant institutional entry into commodity-backed digital assets This launch demonstrates growing institutional adoption of blockchain technology for tokenizing real-world assets, particularly from established Japanese corporations. [Read the full announcement](https://www.optimism.io/blog/mitsui-co.-digital-commodities-launches-zipangcoin-on-op-mainnet)

**ZPG has launched on OP Mainnet**, joining an ecosystem that includes infrastructure from major players like Coinbase, Soneium, Ink, Bitpanda, and Uniswap. **Key facts:** - Over 50 OP Stack chains now in production - Developed by the Optimism Foundation - Part of the Superchain ecosystem powering 58.5% of all Layer 2 transactions The OP Stack provides shared security, upgrades, and services across all participating networks, creating a unified scaling solution for Ethereum.

A new Ethereum experiment can be reversed at any time without impacting stake withdrawals. The team has built in safety measures - if key performance metrics show problems, they'll switch back to the standard system. This follows earlier security work from February that added protective guardrails to Weighted and Stable pools, blocking operations that serve no legitimate purpose. The rollback capability means validators and stakers face minimal risk during the testing phase.