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Coin Circle (120btc.COM) News: zkSync, the Ethereum L2 expansion plan based on zero-knowledge proof technology (ZKrollup), launched the mainnet zkSync on March 24
After Era, it quickly gained the attention of market investors. In less than two weeks, its lock-in volume (TVL) exceeded US$100 million.

 The zkSync Era ecological project raised 921ETH and the card cannot be withdrawn in the contract

However, as the number of users increased rapidly, zkSync Era, which is currently in the alpha stage, also began to experience technical problems. First, it experienced an outage on April 1, and block production was temporarily suspended for more than 3 hours.

Today (7th), according to a tweet posted by The Block researcher Eden Au, zkSync
A new project on Era completed a crowdfunding of 921ETH (worth about $1.7 million) through a token sale, but because of a problem with the contract code (the transfer() function works on Ethereum and other EVM chains, but not on zkSync) , causing the funds raised to be "forever" stuck in the contract and unable to be withdrawn.

 zkSync: Solution to unfreeze contract found

In response, zkSync issued an urgent statement to clarify that this new project is Gemholic and stated that the funds are "safe" and the current team is working with the project parties to help them solve the problem. zkSync additional explanation: Any smart contract that calls the transfer() or send() function relies heavily on Gas cost (hard-coded 2300Gas), but this is not guaranteed to work on Ethereum because the fallback() function may consume more than 2300Gas, and Opcode in future versions of Ethereum
Gas pricing may change, resulting in contract disruption. However, zkSync
Era itself is different from the general EVM compatible environment. It adopts a dynamic and divergent Gas measurement method, making some transaction types more efficient than other EVM
Rollup's transactions are 10 to 1000 times cheaper. Therefore, according to the current gas level of the Era main network, any transfer() call without a clear gas allowance will currently fail.

However, zkSync stated that it has found a solution to unfreeze the contract: "This will require minimal changes to the gas metering of the protocol, but will allow full recovery of funds. More details are expected to be released tomorrow."

It is worth mentioning that in order to avoid this event on zkSync
The Era ecosystem has had a negative impact. zkSync also emphasized in a tweet that the compiler has added a warning about the transfer() function call, but Gemholic’s contract was directly deployed on the Era mainnet without being tested on the testnet or local node in advance. This is what causes problems.

In addition, zkSync also stated that Consensys warned Solidity developers to give up using the transfer() function as early as three years ago, and most mainstream projects have no longer used the transfer() function, which seems to imply that the occurrence of this problem is not all caused by zkSync.
Era's responsibility.