Solana should implement the final 200-millisecond slot time upgrade

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Robinhood built Robinhood Chain on Arbitrum Orbit to maintain direct control over settlement while remaining connected to Ethereum liquidity and infrastructure

Robinhood Chain operates as an Ethereum Layer-2 network built on the Arbitrum Orbit stack, utilizing ETH for gas fees and featuring block times under 100 milliseconds

Transitioning to a standalone Layer 1 would require Starknet to maintain its own network security backed by the market capitalization of STRK, which stood at $580.24 million on October 15, 2026

The Alpenglow upgrade, scheduled for October 21, 2026, targets block transaction finality of approximately 150 milliseconds on the Solana network, depending on network conditions

Under the Alpenglow upgrade scheduled for October 21, 2026, Solana validators exchange votes directly off-chain and aggregate approvals into a certificate that finalizes blocks after one or two voting rounds

The targeted 150-millisecond finality under the Alpenglow upgrade aims to provide faster irreversibility guarantees for merchants accepting payments and cross-chain bridges releasing funds on Solana

Off-chain validator voting is an acceptable tradeoff for faster transaction finality on Solana

Current Layer 1 (L1) blockchains are several orders of magnitude away from the throughput required for widespread agentic commerce

Moving validator votes off-chain under the Alpenglow upgrade scheduled for October 21, 2026 is expected to significantly reduce Solana's reported on-chain transaction count without reflecting a decline in actual user trading activity

Liquid is a Bitcoin sidechain managed by Blockstream where users lock Bitcoin with a federation through multisig to receive 1:1 backed Liquid Bitcoin

The two-way peg model of federated Bitcoin sidechains depends on both multisig reserve integrity and the software enforcing the peg

Federated sidechains are reliable enough to serve as primary scaling solutions for Bitcoin

Starknet announced on October 8, 2026 that it is actively considering transitioning from an Ethereum layer-2 scaling network to an independent layer-1 blockchain

The shorter block times from SIMD-0525's 200-millisecond upgrade give wallets and applications less time to use a recent blockhash, which is a reference included in Solana transactions to prevent them from being replayed

Under the technical proposal SIMD-0525, Solana's per-block computing limit will shrink to 30 million compute units at 200-millisecond block times, down from 37.5 million at 250 milliseconds

The final 200-millisecond block time upgrade since August on the Solana blockchain, reducing it from 250 milliseconds, is scheduled to take effect at epoch 1053, expected around 15:00 UTC on Friday, October 9, 2026, according to developer Anza

The Solana blockchain network began its phased block time reductions on August 21, 2026, moving to 350 milliseconds, followed by reductions to 300 milliseconds on August 28, 2026, and 250 milliseconds on September 18, 2026

The reduction in per-block computing limits under SIMD-0525's 200-millisecond upgrade is designed to keep the Solana network's theoretical processing capacity roughly unchanged as blocks arrive more frequently

The faster block times from SIMD-0525's 200-millisecond upgrade could reduce opportunities for actors to delay transactions or exploit prices that have moved on other exchanges before the Solana blockchain catches up

Anza said the faster block times from the 200-millisecond upgrade on the Solana blockchain will shorten the validity window for transactions, which could complicate transactions requiring manual approval or offline signatures