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Solidity Solidity Due to a bug in the Solidity compiler that we discovered while working on GasToken, under rare circumstances, freeing GST2 tokens may not yield a gas refund.

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This example contract illustrates how to check that this condition holds. The comments in the GST2 source code contain further details.

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The Details An obvious question is when it's efficient for a user to use GasToken in their own transactions. Bear with us for a little math here.

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Writing permanent blockchain state costs a significant amount of gas. Erasing the storage by token rate for today it with zeros costs an additional gas, but also provides a refund of gas.

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That is, if gas prices at least double between periods of low usage and periods of high usage, a storage refund could be efficiently used. The dynamics for contract-based refunds are even a bit better in principle. This ignores some inherent hidden costs such as the gas paid per byte of the created contractso in practice the numbers are a bit lower.

Indeed, our GasToken token implementations don't quite reach these theoretically optimal numbers, as there is some additional work to do to keep track of the storage words or the addresses of the contracts to create and delete.

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Some details on how we optimized the gas cost of the contract-based variant of GasToken are below. Fortunately, many of the incurred costs are mostly independent of the number of tokens minted or redeemed in a single transaction.

That is, the more tokens we create or free in a single transaction, the closer we'll get to the optimal gas refund. Keep in mind that gas refunds can pay at most for half the gas cost of a transaction, so freeing more tokens is only worthwhile if we're planning on spending lots of gas to begin with.

When minting tokens, we pay the transaction base fee gas and two storage words get updated for bookkeeping purposes roughly gas, assuming our balance is non-zero.

Bitsten Token to US Dollar Price (BST/USD) – Current Live Value

Every word written into the contract's storage costs roughly an extra gas. When releasing tokens, we'll be calling our GasToken token from within the transaction we wish to save gas fees on.

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So we ignore the base fee here. The above upper bounds for the contract-based scheme are also not quite tight, so in practice we'll probably end up saving slightly more than what we'd expect!

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A picture is worth a thousand words. There is a small regime between the dotted curves where the storage scheme has positive efficiency and beats the contract scheme. For large fluctuations, the earn without investing a lot of money token rate for today is always better.

The code of the child contracts should be as small as possible, as every byte of code costs an extra gas when calling CREATE.

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Each child contract implements the following simple functionality: if msg. Note that this address is very short only 15 non-zero bytes instead of We generated our GasToken contract at such an address on purpose, so as to save some gas when creating contracts.

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If we could make use of address 0x0 for GasToken, we could save an extra gas or so for every created contract! How do we create such a short address? Thus, to create a contract at a short address, we simply iterated through public key values and small nonces until we found a pair that worked. We then created an account with that public key, and generated a few contracts to get the nonce to the right value.

BasicAttentionToken USD (BAT-USD)

GasToken GST2 is now deployed, don't worry about it! Incidentally, we recently realized that the Ethereum Name Service Registrar contract is deployed at address 0xdD8dbbf98f50CCb the leading 4.

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If you know of even "rarer" addresses in Ethereum that is, with an over 5 byte recognizable patternlet us know! Finally, when releasing tokens, our GasToken contract has to figure out the addresses at which the children were created keeping these addresses in storage would be way to expensive, so we recompute them on the fly.

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Our current implementation costs about gas for values of nonce up to a few billion. This can likely be improved, and a more efficient RLP implementation could lead to a slightly better GasToken variant.

There's no ICO, token launch, or whatever your lawyers want to call it today.

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Just start using GasToken, on the chain, right now. Who is behind this?

Share to Linkedin Spark token airdrop comes with an unintended tax bill that recipients need to be aware of. People who hold XRP on certain exchanges as of December 12, are receiving an equivalent amount of Spark token via an airdrop.