The issue you're encountering with the certify blob transaction failing in the @mysten/walrus SDK is likely related to incorrect configuration settings or an outdated version of the SDK. Often, the certification step failure can stem from not having enough SUI tokens, which are required for completing the transaction on the blockchain .

Make sure that your SDK configuration is correctly set up. You need a valid system package ID and enough tokens. Furthermore, the Walrus Testnet requires updates to the latest binary and configuration as it is periodically wiped .

It's worth checking if you're using the latest version of the SDK. A recent update might have fixed a known issue related to certification failures. One more thing to check would be ensuring your Sui wallet and network configurations are correct. Sometimes, certification issues occur due to the misconfigured wallet pointing to the wrong network .