I.B
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1 answers
9 votes
1k views
Are there any other "smart contract standards" like ERC20?
Accepted answer
9 votes

Yes you are right there is a lot of standards but the majority of them are proposals and not standards that have been adopted. You can check all the Ethereum Improvement Proposals (EIPs). ERC-190 ...

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2 answers
6 votes
5k views
When are “pending” transactions dropped from the blockchain?
6 votes

All transactions are kept in the Mempool a term borrowed from Bitcoin. You can see all the current pending transactions here: Pending Transactions There's a limit to the size of the Mempool and once ...

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2 answers
2 votes
22k views
what is a private key in an ethereum wallet like metamask? and how do I find it?
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4 votes

You can export your private key in metamask doing the following if you only want to export a single account to another wallet, you can click the "Export Private Key" option on the Account ...

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3 answers
4 votes
7k views
How many Ethereum-based tokens are there?
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3 votes

From Etherscan it says: There are a total of 17724 Erc20 Token Contracts Which would be all the tokens that follow the Ethereum ERC20 Token Standard Interface. I counted all the tokens on ...

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1 answers
1 votes
3k views
Does etherscan require the use of an api key
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2 votes

If you wanna be able to push more transaction an API Key is required, from I need an API key As a developer, you will need to get an API key if you plan to push a lot more transactions once you ...

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1 answers
1 votes
76 views
How can I see if I have any ether?
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2 votes

You can check on Etherscan all the information about your account. You could also import your account to a different wallet like Metamask that doesn't require you to run a full node, which will allow ...

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3 answers
1 votes
1k views
Fallback function requires too much gas
2 votes

Your endTime in your advance token is set to uint256 private endTime = 123456; //@TODO. When your fallback function gets called it verifies require(now < endTime); since it's false it will not work....

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1 answers
0 votes
1k views
Why are unsold tokens burned after ICO?
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1 votes

Having the option to burn tokens allows the owners to control the supply of their tokens. The amount of tokens in circulations affects a lot the price of the token. So some people might be more ...

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1 answers
0 votes
444 views
Is it possible to set up a token with a fixed amount available, where all coins can be redistributed among token holders?
1 votes

As I see it this would only be possible if you create a platform where you handle the accounts of the users that hold the token because if they can take the tokens out of your platform you won't have ...

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2 answers
0 votes
516 views
How can I implement rational operations in Solidity?
1 votes

You can easily get the percentage by multiplying then dividing your value. Examples: 10% of 100 you can do 100 × 10 ÷ 100 = 10 6% of 100 you can do 100 × 6 ÷ 100 = 6 6.5% of 50 you can do 50 × 65 ...

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1 answers
0 votes
48 views
erorr when writing a contract on mist wallet
1 votes

The warning is pretty clear you need to specify the visibility of your function function Ownable() public { owner = msg.sender; }

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1 answers
0 votes
2k views
Using a crowdsale contract, how to mint token in another token contract?
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0 votes

Yes what you need to do is first create your token in a separate contract. Then when you create your crowdsale you pass in the constructor the address of your token. This is a sample taken from the ...

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2 answers
2 votes
465 views
Difference between eth.newAccount and personel.newAccount
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From the documentation the definition for both is a little bit different eth.accounts The web3.eth.accounts contains functions to generate Ethereum accounts and sign transactions and data. There ...

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1 answers
1 votes
371 views
Missing Token Contract Address in Rinkeby Network
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0 votes

You can see your token here ERC20-TOKEN Dream Token The reason why you see that the token were sent from the 0x000... address is because you minted the new tokens. When tokens are minted the address ...

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2 answers
2 votes
124 views
Remix not allowing public arrays
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0 votes

It does give the error but if you check to the right under the create button you'll see that your contract was created.

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1 answers
1 votes
318 views
wallet or node installed
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0 votes

Mist (the ethereum wallet you downloaded) requires a full node to be functional. So you have to wait for it to finish syncing. You can interact with the ethereum blockchain without downloading a full ...

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1 answers
0 votes
550 views
How can I run Mist as a Full Node?
0 votes

Once you install Mist and run it, it will prompt you to create an account and then it will start syncing you will be able to see the process. When it finishes you'll be able to use Mist and you'll ...

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