diff --git a/MEV_by_chains/MEV_on_Ethereum/ethereum_2.0/shapella.md b/MEV_by_chains/MEV_on_Ethereum/ethereum_2.0/shapella.md
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+## shangai updates
+
+<br>
+
+### tl; dr
+
+<br>
+
+* the [shapella upgrade](https://blog.ethereum.org/2023/03/28/shapella-mainnet-announcement) added changed to the execution layer (shanghai), consensus layer (capella), and the engine API, being the last piece of the puzzle that marks the completion of ethereum’s transition to pos. 
+* To make it possible to unlock their staked ETH, shapella introduces `BLSToExecutionChange` (BTEC) message to the consensus layer, which allows validators to set the execution address for withdrawals. the beacon chain can only process a maximum of 16 withdrawals per block, with the limit in place to maintain network security.
+* EIPS: EIP-3651, EIP-3855, EIP-3860, EIP-4895, EIP-6049
+* Boards: [nansen](https://twitter.com/nansen_ai/status/1645696820348321793), [dune by 21 shares](https://dune.com/21shares_research/shanghai-upgrade-coundown)
+
+
+
+<br>
+
+---
+
+### resources
+
+<br>
+
+* [staking rewards](https://www.stakingrewards.com/)
+* [the ultimate guide for shapella, by perpetual](https://perpprotocol.mirror.xyz/Ng0NmBHmMgOKfrZhtR_lDv1JG-Out79NUB5b0OfLDB8)
+* [shangai updates and warm fees, by min](https://www.livemint.com/market/cryptocurrency/ethereum-insiders-to-get-fee-cuts-that-others-won-t-in-upgrade-11667749979740.html)
+
diff --git a/MEV_by_chains/MEV_on_Ethereum/shangai.md b/MEV_by_chains/MEV_on_Ethereum/shangai.md
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-## shangai updates
-
-<br>
-
-### tl; dr
-
-<br>
-
-* WARM coinbase: reduce fees paid by builders (26x lower?), high-volume trading savings
-
-
-
-<br>
-
----
-
-### resources
-
-<br>
-
-* [shangai updates and warm fees, by min](https://www.livemint.com/market/cryptocurrency/ethereum-insiders-to-get-fee-cuts-that-others-won-t-in-upgrade-11667749979740.html)