added temp changelog tab

docs/AGENTS.md

@@ -74,11 +74,13 @@ npx skills add base/base-skills
 |base-account/reference/prolink-utilities:createProlinkUrl,decodeProlink,encodeProlink
 |base-account/reference/spend-permission-utilities:fetchPermission,fetchPermissions,getPermissionStatus,prepareRevokeCallData,prepareSpendCallData,requestRevoke,requestSpendPermission
 |base-account/reference/ui-elements:base-pay-button,brand-guidelines,sign-in-with-base-button
-|base-chain:overview
+|base-chain:changelog,overview
 |base-chain/api-reference:rpc-overview
 |base-chain/api-reference/debug-api:debug_traceBlockByHash,debug_traceBlockByNumber,debug_traceTransaction
 |base-chain/api-reference/ethereum-json-rpc-api:eth_blockNumber,eth_call,eth_chainId,eth_estimateGas,eth_feeHistory,eth_gasPrice,eth_getBalance,eth_getBlockByHash,eth_getBlockByNumber,eth_getBlockReceipts,eth_getBlockTransactionCountByHash,eth_getBlockTransactionCountByNumber,eth_getCode,eth_getLogs,eth_getStorageAt,eth_getTransactionByBlockHashAndIndex,eth_getTransactionByBlockNumberAndIndex,eth_getTransactionByHash,eth_getTransactionCount,eth_getTransactionReceipt,eth_maxPriorityFeePerGas,eth_sendRawTransaction,eth_subscribe,eth_syncing,eth_unsubscribe,net_version,web3_clientVersion
 |base-chain/api-reference/flashblocks-api:base_transactionStatus,eth_simulateV1,flashblocks-api-overview,newFlashblockTransactions,newFlashblocks,pendingLogs
+|base-chain/changelog:beryl,denim
+|base-chain/changelog/cobalt:b20
 |base-chain/flashblocks:faq
 |base-chain/network-information:base-contracts,base-solana-bridge,bridging-and-withdrawals,configuration-changelog,ecosystem-bridges,network-faucets,network-fees,throughput-and-limits,transaction-finality,transaction-ordering,troubleshooting-transactions
 |base-chain/node-operators:node-providers,performance-tuning,run-a-base-node,snapshots,troubleshooting

docs/base-chain/changelog.mdx

@@ -0,0 +1,14 @@
+---
+title: "Changelog"
+description: "Changes introduced by Base protocol upgrades."
+---
+
+This changelog tracks developer-facing changes introduced by Base protocol upgrades.
+
+## Upgrade changelogs
+
+Select an upgrade in the sidebar to view its changes:
+
+- [Beryl](/base-chain/changelog/beryl)
+- [Cobalt: B20](/base-chain/changelog/cobalt/b20)
+- [Denim](/base-chain/changelog/denim)

docs/base-chain/changelog/beryl.mdx

@@ -0,0 +1,14 @@
+---
+title: "Beryl"
+description: "Developer-facing changes introduced by the Beryl upgrade."
+---
+
+The Beryl upgrade introduces [B20](/base-chain/specs/upgrades/beryl/b20/specification), Base's
+native token standard for stablecoins, real-world assets, and long-tail tokens. It also reduces
+the single-proof withdrawal finalization period from seven days to five days and introduces Reth
+V2 improvements.
+
+## More about Beryl
+
+See the [Beryl overview](/base-chain/specs/upgrades/beryl/overview) for activation dates,
+required software versions, and the complete upgrade summary.

docs/base-chain/changelog/cobalt/b20.mdx

@@ -0,0 +1,53 @@
+---
+title: "B20"
+description: "B20 changes introduced by the Cobalt upgrade."
+---
+
+Cobalt is additive-only. It does not change or remove any Beryl selector, event topic, or error
+selector. Symbols that supersede Beryl symbols are deprecated rather than deleted, so existing
+integrations remain callable.
+
+<Warning>
+Cobalt has not activated yet. The changes below are not callable until Cobalt activates.
+</Warning>
+
+## B20 Asset: scheduled multiplier updates
+
+The B20 Asset multiplier surface becomes conformant with [ERC-8056](https://eips.ethereum.org/EIPS/eip-8056)
+and the [B20 Asset multiplier migration details](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_B20Asset_multiplier.md):
+
+- Adds [`uiMultiplier`, `toUIAmount`, `fromUIAmount`, `balanceOfUI`, and `totalSupplyUI`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_B20Asset_multiplier.md#functions).
+- Adds [`updateUIMultiplier(uint256,uint256)`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_B20Asset_multiplier.md#scheduled-update-lifecycle) for scheduling corporate-action multiplier updates.
+- Retains [`updateMultiplier(uint256)`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_B20Asset_multiplier.md#updatemultiplieruint256-remains-as-an-instant-admin-failsafe) as an instant administrative failsafe.
+
+Applications should use the ERC-8056 names and move routine multiplier changes to the scheduled
+[`updateUIMultiplier`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_B20Asset_multiplier.md#scheduled-update-lifecycle) function.
+
+## B20 Asset and Stablecoin: seize surface
+
+Cobalt adds [`seizeWithMemo`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_B20_seize.md#new-at-cobalt-adopt-these),
+an administrative balance-reassignment operation gated by [`SEIZE_ROLE`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_B20_seize.md#functions).
+It also adds a [`SEIZE`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_B20_seize.md#pause-features)
+pause vector and two policy slots. [`burnBlocked`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_B20_seize.md#burnblocked-is-deprecated-but-unchanged-and-still-dialable)
+is deprecated in favor of `seizeWithMemo`, but remains callable and unchanged for compatibility.
+
+Seize is opt-in per token and has no effect until the issuer sets
+[`SEIZE_HOLDER_POLICY`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_B20_seize.md#functions).
+To destroy supply after a seizure, call [`burn(uint256)`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_B20_seize.md#burnblocked-is-deprecated-but-unchanged-and-still-dialable) separately.
+
+## PolicyRegistry: composite policies
+
+PolicyRegistry adds composite policies that combine two to four existing simple policies using an
+OR (`UNION`) or AND (`INTERSECT`) gate. See the [composite policy details](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_PolicyRegistry_composite_policy.md)
+for the selector mapping and edge cases. Integrators can create and update them with
+[`createCompositePolicy`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_PolicyRegistry_composite_policy.md#new-at-cobalt-adopt-these)
+and [`updateComposite`](https://github.com/base/base-std/blob/main/changelog/02_Cobalt_PolicyRegistry_composite_policy.md#new-at-cobalt-adopt-these)
+instead of duplicating policy logic off-chain.
+
+Existing `createPolicy` and `createPolicyWithAccounts` integrations do not otherwise change; they
+only gain a new revert path for the previously unreachable composite `policyType`.
+
+## Full Base Standard changelog
+
+For selector-level details, including exact function selectors, event topics, error codes, and
+edge-case behavior, see the [Base Standard changelog](https://github.com/base/base-std/blob/main/CHANGELOG.md).

docs/base-chain/changelog/denim.mdx

@@ -0,0 +1,8 @@
+---
+title: "Denim"
+description: "Developer-facing changes introduced by the Denim upgrade."
+---
+
+## Status
+
+No Denim changes have been published yet.

docs/docs.json

@@ -384,6 +384,30 @@
               }
             ]
           },
+          {
+            "group": "Changelog",
+            "pages": [
+              "base-chain/changelog",
+              {
+                "group": "Beryl",
+                "pages": [
+                  "base-chain/changelog/beryl"
+                ]
+              },
+              {
+                "group": "Cobalt",
+                "pages": [
+                  "base-chain/changelog/cobalt/b20"
+                ]
+              },
+              {
+                "group": "Denim",
+                "pages": [
+                  "base-chain/changelog/denim"
+                ]
+              }
+            ]
+          },
           {
             "group": "Security",
             "pages": [

docs/llms-full.txt

@@ -163,6 +163,10 @@ const client = createPublicClient({ chain: base, transport: http() })
 - [newFlashblockTransactions](https://docs.base.org/base-chain/api-reference/flashblocks-api/newFlashblockTransactions): Subscribe to receive each transaction as it is pre-confirmed into a Flashblock. Only available on Flashblocks WebSocket endpoints.
 - [pendingLogs](https://docs.base.org/base-chain/api-reference/flashblocks-api/pendingLogs): Subscribe to logs from pre-confirmed transactions matching an optional filter. Only available on Flashblocks WebSocket endpoints.
 - [Base RPC Overview](https://docs.base.org/base-chain/api-reference/rpc-overview): Complete reference for all JSON-RPC and Flashblocks methods available on Base nodes.
+- [Changelog](https://docs.base.org/base-chain/changelog): Changes introduced by Base protocol upgrades.
+- [Beryl](https://docs.base.org/base-chain/changelog/beryl): Developer-facing changes introduced by the Beryl upgrade.
+- [B20](https://docs.base.org/base-chain/changelog/cobalt/b20): B20 changes introduced by the Cobalt upgrade.
+- [Denim](https://docs.base.org/base-chain/changelog/denim): Developer-facing changes introduced by the Denim upgrade.
 - [Flashblocks Reference](https://docs.base.org/base-chain/flashblocks/faq): Reference for Flashblocks on Base — key concepts, architecture, and frequently asked questions about block building, WebSocket data, RPC usage, and node setup.
 - [Contract Addresses](https://docs.base.org/base-chain/network-information/base-contracts): A comprehensive list of contract addresses for Base Mainnet and Base Testnet, including links to their respective blockchain explorers.
 - [Base-Solana Bridge](https://docs.base.org/base-chain/network-information/base-solana-bridge): Bridge tokens and messages between Base and Solana Mainnet

docs/llms.txt

@@ -75,6 +75,10 @@
 - [newFlashblockTransactions](https://docs.base.org/base-chain/api-reference/flashblocks-api/newFlashblockTransactions): Subscribe to receive each transaction as it is pre-confirmed into a Flashblock. Only available on Flashblocks WebSocket endpoints.
 - [pendingLogs](https://docs.base.org/base-chain/api-reference/flashblocks-api/pendingLogs): Subscribe to logs from pre-confirmed transactions matching an optional filter. Only available on Flashblocks WebSocket endpoints.
 - [Base RPC Overview](https://docs.base.org/base-chain/api-reference/rpc-overview): Complete reference for all JSON-RPC and Flashblocks methods available on Base nodes.
+- [Changelog](https://docs.base.org/base-chain/changelog): Changes introduced by Base protocol upgrades.
+- [Beryl](https://docs.base.org/base-chain/changelog/beryl): Developer-facing changes introduced by the Beryl upgrade.
+- [B20](https://docs.base.org/base-chain/changelog/cobalt/b20): B20 changes introduced by the Cobalt upgrade.
+- [Denim](https://docs.base.org/base-chain/changelog/denim): Developer-facing changes introduced by the Denim upgrade.
 - [Flashblocks Reference](https://docs.base.org/base-chain/flashblocks/faq): Reference for Flashblocks on Base — key concepts, architecture, and frequently asked questions about block building, WebSocket data, RPC usage, and node setup.
 - [Contract Addresses](https://docs.base.org/base-chain/network-information/base-contracts): A comprehensive list of contract addresses for Base Mainnet and Base Testnet, including links to their respective blockchain explorers.
 - [Base-Solana Bridge](https://docs.base.org/base-chain/network-information/base-solana-bridge): Bridge tokens and messages between Base and Solana Mainnet