Questions tagged [tokens]

A token is a transferable, divisible object on the blockchain, such as a subcurrency or a prediction market share.

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42
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3answers
22k views

What is a sidechain?

The Ethereum subreddit has this post related to an Ethereum-Dogecoin sidechain. What is a sidechain? Could one sidechain be a private Ethereum network?
39
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2answers
24k views

How do I convert my The DAO tokens into ethers using the withdrawal contract after the hard fork?

The DAO contract was attacked on 17th June 2016 where the attacker drained about USD 50 million worth of ethers using a recursive call vulnerability in The DAO contract code. The attacker drained ...
30
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3answers
20k views

ERC20 vs ERC223. List of differences

Is there a list of improvements that we will have in ERC223? Are there examples of contracts? Is there a migration path for existing ERC20 tokens?
23
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5answers
16k views

Paying a transaction fee with an ERC20 token

As far as I understand, one of the ERC20 token's features is that you can pay a transaction fee with it. In other words, you can send them without having Ether. I transferred REP tokens to the ...
16
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2answers
9k views

How do I convert my The DAO tokens into ethers on the Ethereum Classic chain?

According to Whitehat Withdrawal contract - Update and Next Steps and Whitehat Withdrawal contract - Last update before deployment, the Goodies will be deploying the withdrawal contracts whetcwithdraw....
16
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2answers
4k views

What are the key criteria for meeting the ERC20 token standard?

I'm looking for a clear way to describe "the ERC20 token standard" to regular folks like me who are not developers, and can't seem to find a plain language articulation of the core components of that ...
15
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2answers
9k views

If someone found a private key to 0x0, would they be able to access all the tokens (over one billion dollars worth) stored there?

The 0x0 address in Ethereum has a lot of token stored in it that have been burnt in the past. However, it appears they burning is the same as sending to 0x0. In that case, could all of those burnt ...
15
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4answers
72k views

How To Transfer Tokens Out Of Metamask Wallet

I have some tokens in my Metamask wallet and want to transfer them to an exchange to trade but I don't know how to do. Metamask now allows you to see the tokens as per the recent upgrade but I don't ...
15
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2answers
11k views

How do I get a refund for the amount I paid in excess of 1 ether to 100 The DAO tokens

Anyone who bought DAOs in the last two weeks of The DAO crowdfunding phase paid more than 1 ether (ETH) per 100 The DAO tokens (DAO). The ETH amount in excess of 1 ETH per 100 DAOs was stored in The ...
14
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2answers
3k views

How can ERC20 token implementations be verified?

The ERC20 Token Standard is great, in that it allows wallets, exchanges, and client implementations to allow users to interface with a variety of tokens in a common way. But how can one of these ...
14
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1answer
6k views

Are ERC20 token names unique?

I am curious if ERC20 token names are unique on the Ethereum block chain? For example, what is to stop someone from creating a new token called Golem (GNT) and publishing it to a smart contract? I ...
13
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4answers
13k views

How can I find out the token balance of some address?

How can I find out the token balance of some address using Solidity? For example, I have the address of another person, and I need to know the number of tokens on his account.
13
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2answers
42k views

How to get tokens out of a metamask account

I transferred tokens (GNT) from an exchange to a metamask account but I can't figure out how to get them out. They do not show up in metamask, but etherscan shows them. I tried to import the account ...
13
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2answers
2k views

ERC20 Tokens with Rewards?

How hard is it to implement rewards into ERC20 Tokens? By this I mean a ERC20 Token that receives a reward in the form of Ether from a rewardAccount that is distributed evenly between all tokens. ...
11
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3answers
3k views

How to remove custom tokens from mist?

In the MIST wallet (0.5.2) I somehow managed to create a Watch Token contract which was not correct and then it showed up like this: the one in the middle. It is greyed out and I want to delete it, ...
11
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3answers
2k views

How do you verify a contract on etherscan that is deployed by another contract?

How do you properly verify a contract on etherscan that is deployed by another contact? I deployed a contract that deploys other contracts onto the blockchain. The original contract is verified , ...
11
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4answers
10k views

Solidity/Remix Error : The constructor should be payable if you send value. How to solve this?

pragma solidity ^0.4.16; contract MyToken { // This creates an array with all balances mapping (address => uint256) public balanceOf; // Initializes contract with initial supply tokens to ...
11
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1answer
2k views

Can an Ethereum address hold more than Ether?

Let me explain it with examples. On Bitcoin protocol, for example, you have Counterparty. As it uses embedded consensus, every XCP address is linked to a Bitcoin address. So if you hold bitcoins on ...
10
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3answers
3k views

Accepting an ERC20 Token as Payment

Assuming I have deployed my ERC20 token, and the supply has been dispersed, is there any method of creating a separate contract that accepts that ERC20 token as payment and has user fields that send ...
9
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2answers
2k views

Float not allowed in solidity vs decimal places asked for token contract

We know that solidity doesn't support the float values. But here (https://www.ethereum.org/token#understanding-the-code) they accept one input parameter 'decimal places' for calculation purpose. How ...
9
votes
1answer
4k views

What is the purpose of interface contracts?

Reading The DAO and DigixDAO source code I notice that in contract systems there are often interface contracts where functions are declared without any body. For example, contract TokenInterface { ...
9
votes
1answer
2k views

ICO crypto-currencies accepted during the sale: ETH, BTC, or even fiat?

ICO contracts are meant to accept Ether as payin for the tokens sold, for example https://cartaxi.io/pre-ico or https://www.herocoin.io/ But there are a lot of ICOs running on Ethereum that accept ...
9
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2answers
11k views

How can I watch tokens in Parity wallet?

I love the Parity Ethereum wallet. It works very well. But I assumed it would automatically show any tokens I own if I watched contract that held the tokens. For example if I watch singularDTV ...
9
votes
1answer
75 views

What will happen to legacy smart contracts when Ethereum 2.0 is released?

Most importantly, ERC20 and ERC721 tokens. Will they be migrated to the new chain? Will migration only be optionally possible for contracts with an owner? What about contracts which rely on proof of ...
8
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2answers
12k views

Getting ABI data for ERC20 tokens programatically with Web3 [duplicate]

I am just starting to dive into Web3. I am trying to display the various ERC20 token values for a given Ethereum Address. The pieces I need to do this are: Token Contract Address Token Contract ABI ...
8
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3answers
10k views

Best way to burn ethers and other ethereum tokens?

Is it correct that any ethers or tokens sent to the address 0x0000000000000000000000000000000000000000 will be destroyed? Or what is the best way of burning ethers / tokens?
8
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3answers
2k views

Can I sell a portion of my DAO tokens on a market place?

If I bought all my DAO tokens with the same account, will I be able to sell only a portion of them on a marketplace?
8
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3answers
7k views

What are digital tokens? How are various tokens generated on Ethereum?

I've heard in various talks, Ethereum can generate any token (besides ether), representing anything from bitcoin (through btc-relay), litecoin, dogecoin, digital assets, shares, ownership ...
8
votes
3answers
3k views

How can I read any token units received in a Smart Contract? (Ether and other Tokens)

I would like to know how to identify units of specific tokens received in a Smart Contract. I am building a Smart Contract that can receive ether or other ethereum tokens and in exchange for the ...
8
votes
1answer
258 views

Passive DAO participation vs. Active DAO Participation

If being part of "The DAO" is similar to being a shareholder in a company, how is the passive DAO Token holder affected by decisions made by the active participants. If for example, the Slock.it ...
8
votes
1answer
2k views

Performing a smart escrow with ERC20 tokens

After developing a token Smart Contract that is compliant with the ERC20 standard https://github.com/ethereum/EIPs/issues/20 (is that the same as token API https://github.com/ethereum/wiki/wiki/...
8
votes
1answer
1k views

Following token tutorial on ethereum.org, get error message “No data is deployed on the contract address”

I'm simply copying the full coin code found in this tutorial to deploy a contract on the testnet using mist, but I get the error message "No data is deployed on the contract address". The contract ...
8
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2answers
5k views

Get smartcontract token balance via JSON RPC

Via Geth commandline I can get my smartcontract token balance with: var mytest = eth.contract([{interface}]).at(contract address); mytest.balanceOf(eth.accounts[0]) >998 I want to present the ...
7
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4answers
6k views

How to withdraw Ether from The DAO?

As I understand, everyone who invested in The Dao recieves tokens which enable to propose and vote in the DAO. And anyone holding tokens could anytime withdraw the Ether invested if he is not ...
7
votes
2answers
4k views

Why does my smart contract tokens not show up in MyEtherWallet or MetaMask?

I have deployed a very basic smart contract to the Rinkeby test network. The contract's address is 0xb145b6d8757b40ac80b5fe2a98ab6c8450a54585. I have made transactions to it using MetaMask, and they ...
7
votes
2answers
5k views

Decimals on ERC20 Tokens

I'm having an odd problem working with some ERC20 token contracts I've written: When I specify a decimal value, let's say 4 here for simplicity, the values show up differently in Mist vs etherscan. ...
7
votes
1answer
533 views

How can I list The DAO proposals and vote from the command line?

Are there any command line tools to vote on The DAO proposals? I would like to: List the open proposals Check whether I have already voted on these proposals Check my voting history Vote on the ...
7
votes
1answer
810 views

Buy Gnosis tokens with geth

How to participate to Gnosis pre-sale using geth javascript console? In gnosis official blog is described how to do it using parity but there's no information on how to do it using geth.
7
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3answers
2k views

What are DAO tokens?

I tried to understand what a DAO token is that you can buy for Ether, but I can't. And because my OSX Ether wallet has issues, I can't try to buy DAO tokens, so I hope you could explain me what it is....
7
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2answers
1k views

How to implement the ERC777 token standard?

Does anyone know how to correctly implement the new ERC777 token standard? I've been trying to create an ERC777 contract (see code below) but keep struggling with a couple of things. According to ...
7
votes
1answer
509 views

Parity - Token disappear

love parity, great Ethereum Client and a stunning pace of progress. If the developers read this: Much thanks! But there is one little tiny bug ... When I start parity and open the visual wallet in ...
6
votes
4answers
9k views

How to transfer ERC20 tokens using web3js

I've read some docs, run parity in docker container, and being able to connect and get token balance of an account const Web3 = require('web3'), const web3 = new Web3(new Web3.providers.HttpProvider('...
6
votes
3answers
3k views

Error creating contracts on Ethereum wallet

First of all, I'd like to provide a disclaimer. I'm not a developer, I never studied codes, and never wrote scripts since I was 14 years old. I'm doing this project for the company I work in at the ...
6
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2answers
5k views

Why most ERC-20 Tokens Have 18 Decimals?

I don't really understand the fundamental rationale for this. I'd think 0 decimal is much simpler to understand for most people?
6
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2answers
2k views

Are mineable tokens possible?

I'm a bit puzzled about the ethereum.org/token example which states further down in the advanced examples that it can be coupled to proof-of-work. I really like the idea of mining a token. The example ...
6
votes
1answer
2k views

ERC20 vs ERC721

Is there a list of changes that making ERC721 become non-fungible token and different from ERC20? Are there examples of ERC721 contracts? Is there any drawback of ERC721?
6
votes
1answer
4k views

Crowdsales: non-mintable tokens vs mintable tokens (with hard cap)

There are crowdsales where the initial supply is set upon deployment which is set to the defined total supply (so that number is as many tokens that there will be) and when someone buys tokens during ...
6
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1answer
611 views

Is there a mobile wallet for iOS?

I looks like JAXX is only for Android. Is there really no option for iPhone yet?
6
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3answers
25k views

Accessing ERC-20 tokens in MetaMask

I sent tokens (veri) from my ether wallet to meta mask address ether scan shows the transaction but i cannot see them or send them. If you have a solution please explain as if i were 4 yr old. cheers ...
6
votes
3answers
2k views

How to find all token holders?

For example, the contract saves the address when token created but after that token holder could send token or all tokens to another wallet. Is it possible to find all wallet addresses of token ...