Weekly Blockchain Node Upgrades Changelog - 2025-11-27 (#861)

* Add weekly changelog for 2025-11-27

* Update 2025-11-27.md

* Add weekly changelog for 2025-12-04

* add product updates

---------

Co-authored-by: Darius Crisan <[email protected]>
Co-authored-by: Sahil Aujla <[email protected]>

Author: 3 people

fern/changelog/2025-11-27.md

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+## Node
+
+**Upgrades**
+
+* Polygon Amoy: Erigon [v3.3.1-beta3](https://github.com/0xPolygon/erigon/releases/tag/v3.3.1-beta3), Bor [v2.5.2-beta2](https://github.com/maticnetwork/bor/releases/tag/v2.5.2-beta2), Heimdall [v0.5.1-beta](https://github.com/0xPolygon/heimdall-v2/releases/tag/v0.5.1-beta)
+* Unichain Mainnet: Op Node [op-node/v1.16.2](https://github.com/ethereum-optimism/optimism/releases/tag/op-node%2Fv1.16.2)
+* Worldchain Mainnet:Op Reth [v1.9.3](https://github.com/paradigmxyz/reth/releases/tag/v1.9.3)

fern/changelog/2025-12-04.md

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+## Developer Experience
+
+**Docs**
+
+* Shipped a comprehensive revamp of the [Solana documentation](https://www.alchemy.com/docs/solana) with improved navigation, updated content, and new developer tools.
+* Completely refreshed the [Solana Quickstart Guide](https://www.alchemy.com/docs/solana) with a streamlined onboarding flow, tested working scripts for sending requests, creating and funding wallets, and a full breakdown of all supported Solana methods organized by category.
+* Published two brand-new tutorials with fresh, working code repositories that walk developers through building live, functioning sample apps—replacing the previous outdated guides.
+* Introduced a new [Compute Unit (CU) Calculator](https://solana-demo-sigma.vercel.app/) to help developers understand how many CUs their integrated methods require and plan their usage accordingly.
+* Updated the Solana FAQ with a methods-by-category breakdown, making it easier to discover what's supported and what you can build with each method.
+
+## Rollups
+
+* Launched Mythos Mainnet for Mythical Games, our first OP Stack Layer 3 rollup. Mythical Games will use this rollup to power in-game NFT items and their marketplace for popular mobile games like NFL Rivals.
+* Shipped support for the Fusaka activation on Ethereum Mainnet, enabling rollups with Ethereum Mainnet as the parent chain to continue sequencing after the network upgrade.
+
+## Node
+
+**Upgrades**
+
+* Arbitrum Mainnet: Arbitrum v3.9.3-8bc5554
+* Arbitrum Nova: Arbitrum v3.9.3-8bc5554
+* Arbitrum One: Arbitrum v3.9.3-8bc5554
+* Arbitrum Sepolia: Arbitrum v3.9.3-8bc5554
+* Base Mainnet: Opgeth [v1.101603.5](https://github.com/ethereum-optimism/op-geth/releases/tag/v1.101603.5), Opnode op-node/v1.16.2, Reth [v1.9.3](https://github.com/paradigmxyz/reth/releases/tag/v1.9.3)
+* Gnosis Chiado: Erigon [v3.2.2](https://github.com/erigontech/erigon/releases/tag/v3.2.2)
+* Ink Mainnet: Op Node op-node/v1.16.2
+* Mantle Sepolia: Opnode [v1.4.1](https://github.com/mantlenetworkio/networks/releases/tag/v1.4.1), Opgeth [v1.4.1](https://github.com/mantlenetworkio/networks/releases/tag/v1.4.1)
+* Optimism Mainnet: Op Node op-node/v1.16.2
+* Polygon Mainnet: Erigon [v3.3.2](https://github.com/0xPolygon/erigon/releases/tag/v3.3.2), Bor [v2.5.2](https://github.com/0xPolygon/bor/releases/tag/v2.5.2)
+* Scroll Sepolia: Scroll scroll-v5.9.18
+* Sonic Mainnet: Sonic [v2.1.4](https://github.com/0xsoniclabs/sonic/releases/tag/v2.1.4)
+* Starknet Mainnet: Starknet v0.21.2
+* Starknet Sepolia: Starknet v0.21.2
+* Worldchain Sepolia: Op Node op-node/v1.16.2