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Hey, Caspar here, main dev. We have an issue with the new IDE that we included in Toolkit (it reloads immediately after deploying a contract, overwriting the txhash), so I rolled it back to the "old" one for now. Pls use https://iost.toolkit.blockdevs.asia/contract/hello for now.
And as to "what we're checking" : this is part of the source code for the level check:
if (
actionName === 'updateCode' &&
tx.publisher === accountName &&
contractData.indexOf('number is ' + levelRandom) >= 0
)