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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6
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2answers
928 views

How are Tokens issued to Bitcoin investors for ICO based on Ethereum

I was looking to know how an Ether based ICO can Accept & Reward Tokens to its Bitcoin donors. I understand that ether can be tracked & reward can be issued to the Donor's ether address ...
4
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2answers
378 views

Can Ethereum tokens representing real-world assets carry variable data (state, units, type, etc.)?

I'm trying to better understand how to implement smart contracts with tokens built on top of Ethereum. Before diving too deeply into the implementation details with Solidity, I'd like to understand ...
15
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2answers
7k 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 ...
6
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1answer
8k views

Obtain token transfer data from an address

I would like to obtain token transfer data from an address via Rest API For example, take this address: https://etherscan.io/address/0xfbb1b73c4f0bda4f67dca266ce6ef42f520fbb98#tokentxns (Etherscan ...
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2answers
1k views

How many ethereum blocks are mined in a day?End and Startblock specification

there is a function in many ico contracts that allow people to adjust their allow purchase and disable purchase functions according to the current block height, basically a function that opens an ICO ...
1
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1answer
460 views

Could not withdraw tokens after crowd sale

I'm trying to implement smart contract for crowd sale and faced following problem. Firstly, I created test token here on Ethereum- using examples from OpenZeppelin framework and test CrowdSale ...
0
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2answers
859 views

How can Creators update or edit there Contracts after they are craeted.

My question is how do people change things in there contract after they have published it, since the ICO contract and the normal contract of a token are usually the same, how do some people have the ...
1
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1answer
1k views

Why don't I see my tokens in Mist?

I think I should have several tokens in my account, but I can only see Ether. Is a wallet contract necessary to see ERC-20 tokens?
2
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1answer
3k views

Why did my withdrawal from EtherDelta fail?

I have 10 VERI coins on EtherDelta. I tried to transfer them to my wallet so I can then make my next move to transfer them to somewhere else. Over 4 hours has passed and these tokens have not moved ...
2
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0answers
751 views

Difference between a Protocol Token and a Dapp Token?

I've seen tokens referred to as "protocol tokens" and "dapp tokens", as far as I can tell they are on in the same. Maybe a protocol token is simply a dapp token with a published ABI? There's even ...
2
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0answers
214 views

How is Ethereum Plasma different from Ardor's Parent Child chain feature?

From my understanding Ethereum's plasma is similar to Ardor's parent child chain feature, but what are the main differences from these two technologies? Ardor is fully proof of stake and it lets you ...
0
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1answer
157 views

Trying to understand token creation in Ethereum

I am looking at Tenx token on the ethereum platform: https://etherscan.io/token/TenXPay Here's what I understand, total supply - 205,218,255.9485 Now when I go to: coinmarketcap.com/assets/tenx/ ...
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1answer
228 views

How can a contract can be notifying when his token balance has changed?

Let’s say that I have: Token Contract (ERC20 token standard) Dapp(Contract) The Dapp account "have" some token. Is there any way to know if the token balance of the Dapp changed? In another words, ...
0
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3answers
959 views

Deploy the ethereum contract token and transfer to other address using node js web3

Deploy the ethereum contract token and transfer token from one address to other address using node js web3.Anyone please help me.
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0answers
285 views

myContractInstance.balanceOf(gnoAccount) is not working in node js web3

I'm trying to deploy a smart contract through NodeJS using web3, but the myContractInstance.balanceOf(gnoAccount) function is not working Here is my code: var Web3 = require('web3'); // Connect to ...
0
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1answer
357 views

I am purchasing cvc through shapeshift. where is my ethe return address [closed]

I am purchasing cvc through shapeshift. Shapeshift is asking me my ethe refund address. do have to create one? or.....
0
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2answers
672 views

Guidance on creating new token with value tied to fiat currency & fixed increases in price (newbie)

I would like to create a new token, but I'm a complete newbie when it comes to Ethereum and cryptocurrencies/blockchain in general. I'm also not a programmer. My goal is to create a fixed number of ...
2
votes
1answer
166 views

Several smart contracts for one coin - TAAS, Bancor?

tokens like TAAS or Bancor have their functionalities, but the are somehow splitted into several different smart contracts? One of them: https://etherscan.io/token/...
2
votes
1answer
2k views

Speed of syncing the chain in parity using archive pruning mode

I am using parity v1.7.0-beta-5f2cabd-20170727 and I sync with ethereum chain in archive mode in order to keep all states of smart contracts. The command i use to launch parity is parity --pruning ...
3
votes
2answers
919 views

Visibility of source code after contract verification

I have seen many verified smart contracts with there source code as visible. E.g. See Here. Now as i want to test my smart contract on Ropsten Network before going live, is it not possible to deploy ...
2
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6answers
2k views

How can I create a Dashboard for my Ethereum ICO investors to track their Tokens

We're launching an Initial Coin Offering (ICO) and I would like to create a user dashboard for investors to track their tokens and the progress of the crowdsale. How can I do this? I'm a web ...
2
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2answers
832 views

Issue with contract verification on Etherscan

I have successfully deployed a new token contract on Etherscan Ropsten Network using metamask. I see my contract listed as "Unverified" so I followed the process given on https://ropsten.etherscan.io/...
0
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1answer
146 views

Issue with contact deployment on etherscan

I have created a new token and deployed it on Ropsten Network using Metamask. I have also followed the norms of ERC20 Token Standard. Now, when I am trying to find my token using Contract address on ...
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1answer
54 views

Why does this modifier require an lvalue?

I copied this code from the Ethereum website and changed the outdated code that the compiler would not accept. However, previously I had no trouble with this modifier (show in the picture) as it now ...
2
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1answer
1k views

EIP 155 - Replay Attack and Backwards Compatibility on ETC chain

I accidentally sent ETC to an address that previously only had ETH on it. This was an address created after the DAO hardfork. As far as I understand with EIP 155 I have replay protection from any ...
1
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1answer
521 views

Getting error while creating a contract using token

I am very new into this, while following this guide. Ethereum Token I am getting error. pragma solidity ^0.4.8; contract tokenRecipient { function receiveApproval(address _from, uint256 _value, ...
0
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1answer
1k views

Unable to verify Token Contract

Having issues verifying my token contract on etherscan.io. Receiving the following errors: Note: Contract was created during Txn# Result: Does not match the input creation bytecode found at this ...
1
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1answer
79 views

Why do I get multiple contracts when using the standard token code?

When using the standard token code given at https://ethereum.org/token#the-code I notice that I get the option to deploy multiple contracts. By deploying all 3 separately, it does not create the ...
4
votes
2answers
301 views

What is “issuer-backed assets” in ethereum white paper?

When talking about options to tackle volatile cryptocurrency prices, Ethereum's white paper has the following discussion: Such a contract would have significant potential in crypto-commerce. One ...
1
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1answer
106 views

creating a charity

I'm trying to create a new coin based on ethereum ... one that will act as a charity. I have the concept of beneficiaries (charities that will get money from the coins owner's account on a regular ...
2
votes
0answers
941 views

How to access Token functions in remix.ethereum.org?

I'm looking at Crowdsale.sol from OpenZeppelin / zeppelin-solidity. Here's a snippet: import '../token/MintableToken.sol'; contract Crowdsale { MintableToken public token; After I create the ...
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2answers
4k views

How to output all data from contract's mapping variable

Solidity enables the use of associative arrays with mapping: mapping(address => uint256) balances; Code can be written to iterate through this associative array. But, how can all of the keys and ...
5
votes
2answers
2k views

Will contract selfdestruct also return tokens?

If I have tokens assigned to a smart contract, will "killing" the contract send leftover tokens to the owner of the contract? I know that remaining Ether stored in the contract is sent to owner in ...
0
votes
2answers
368 views

I am interested in creating a new token and have a few questions

The question is, how can I implement a feature in the smart contract that can keep track of all stakeholders. The reason I ask is that I would like the contract to pay out dividends. So far, the only ...
13
votes
3answers
4k 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 ...
2
votes
1answer
96 views

Some questions about altering new Tokens from a non developer (ELI5 Please).

I am not a developer and have a basic understanding of Ethereum. I apologize in advance if these questions really seem strange and silly but don't have anyone to ask these questions - I tried ...
3
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2answers
766 views

Using token vs Ether in contract

I have a functioning contract that uses Ether as payment for functions and pays out ether based on actions. Is there any good documentation for converting it to use a given token? For instance ...
5
votes
1answer
2k views

Ethereum token divide value by 10^18

I've recently found that the value of token transfers are in 10^18 hex value. For example, in this event, the hex value of the token transfer is ...
2
votes
1answer
1k views

Crowdsale contract and safe withdrawals

According to crowdsale contract at https://www.ethereum.org/crowdsale tokens are transferred to a user account when "function () payable" is called by using external function tokenReward.transfer(msg....
1
vote
1answer
889 views

How send eth from a smart cotract

For example, I have 10 eth on my smart contract. How I send eth on another address?
1
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0answers
537 views

Ethereum token transfer using contract functions?

I have created contract token using solidity realtime compiler and got web3js var initialSupply = 1; var tokenName = 'test' ; var decimalUnits = 0.0014 ; var tokenSymbol = 'TEST' ; var ...
0
votes
1answer
899 views

API to get “total token left” of a custom token

If let say we launch a ICO using Ethereum blockchain, how can I check for total token left in the market? The typical workflow will be like: Investor send n ETH to my wallet System will verify the ...
1
vote
1answer
115 views

Buy tokens through the wallet

i deploy tokens in private net. If i deploy tokens in offical net, how people buy tokens? If they send ether on contract address, they will receives tokens? For example function buy function buy() ...
10
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4answers
15k 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('...
2
votes
0answers
136 views

Very big fee for token on testnet

I'm new here and try to make my own token. I kinda made it actually, but fee for it is very big(cheapest one is 0.65 eth). Here's my code: pragma solidity ^0.4.13; library SafeMath { function mul(...
0
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2answers
2k views

How much was BAT (Basic Attention Token) worth in eth / btc / usd during the 1 minute ICO?

What was the value of BAT (Basic Attention Token) during the 1 minute ICO in eth / usd / btc ? I can't seem to find this info anywhere. And what is the total supply?
6
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3answers
4k 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 ...
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0answers
304 views

How do I set up Ethereum / Mist wallet to watch for GNT

I'm interested in exchanging some ETH for GNT, and send it to my Ethereum wallet. I understand that as a token, I will send it from the exchange to my Mist wallet address. Then how to I configure Mist,...
1
vote
1answer
286 views

How to limit contract compatibility to specific ERC20 token? [duplicate]

How would I go about making sure users of a DApp can only interact with the contract using a specific ERC20 token? For example, say a user has Ethereum, Token 1, and Token 2 in their wallet. The DApp ...
2
votes
1answer
4k views

ERC20 Token holder balances not showing up

I have implemented an ERC20 token using the official standard and am trying to check the token holders on Ropsten Etherscan. It shows the total supply but not the holders. The source can be found here....

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