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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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3answers
18 views

Can an NFT (e.g. ERC721) simultaneously belong to two different entities, say an user Owner, as well as a user Custodian?

For example, on the blockchain say you own a ERC721 Car token at your wallet address, but you want to park it in the ERC998ERC721 top down composable Garage owned by your friend, while still retaining ...
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1answer
695 views

MyEtherWallet shows custom token but etherscan does not show any transaction?

Yesterday I participated in an ICO. I sent ETH to the correct contract adress and my transaction was confirmed. I also found my transaction on the ICO contract adress via etherscan. I then added a ...
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1answer
28 views

Zepellin Crowsale buyTokens error

I'm trying to use the buyTokens function of the Zepellin Crowsale interface, but this gives me an error, without any log to be able to debug contract TokenA is MintableToken, PausableToken, ...
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1answer
259 views

Send multiple transactions

This is contract I plan to implement multi send, so I can send multiple transactions to people. Here is my code pragma solidity ^0.4.11; /** * @title Ownable * @dev The Ownable contract has an ...
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2answers
324 views

ValueError: {'code': -32000, 'message': 'invalid sender'} when calling transferFrom using web3.py

I want to make a function that allows you to send tokens from one owner to another. nonce = w3.eth.getTransactionCount(from_['address']) unsigned_transaction = contract.functions....
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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 ...
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1answer
282 views

Created Token, now can't see my tokens in my account

I followed the basic tutorial to create a new Token, it all seems to have worked correctly, yet I can't see my new tokens in my account (Ethereum Wallet on mac v0.9.3). Also tried via MyEtherWaller....
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1answer
21 views

all erc 721 tokens being collectibles

Considering all NFTs are unique, are all erc 721 tokens collectibles? I'm asking this because on the Etherscan website some NFTs have the collectibles tag and some do not.
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1answer
184 views

Smart contract with authorized actions based on addresses

I want to build a service where users can sign up (off-chain) to get credentials which give them the right to perform certain on-chain actions. For example, lets pretend I'm building a service where ...
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0answers
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Is there an API or library available to integrate an ERC20 compatible wallet into my android app?

If the android app being developed is going to display balances and allow sending and receiving of ERC20 tokens, is there an API or library that people would recommend for this functionality?
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1answer
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Ethereum Contract Scalability (Single vs Multiple Contracts)

I am writing a token swap contract on Ethereum Blockchain to manage ERC 20 token swap in an exchange. The Questions is that in terms of scalability, which of the following two options would be better ...
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2answers
486 views

function () public payable modifier can trigger actions when sending tokens or only works when sending ether?

Modifier payable triggers an action when an address sends ether to a contract. For example: function () public payable { require(msg.data.length == 0); DoSomething(); } Is this ...
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1answer
216 views

Ethereum crowdsale example - Stuck tokens (how to save)

I deployed a crowdsale contract using the source from ethereum.org and loaded it with some tokens. It works as expected, except that it has no code to return the unsold tokens to the beneficiary. Is ...
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1answer
19 views

Deploy a token which you can only send in multiples of x

Im a beginner in solidity. Is there a way to deploy an ERC20 token that can only be sent in multiples of X or else the tx fails?
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1answer
263 views

How can users call the functions of an ERC20 token that was created by another contract (within a crowdsale contract)?

Using Ethereum wallet if I create a token and deploy it I can then interact with it and use the functions of that token (e.g. transfering tokens). However, if I deploy a crowdsale contract and that ...
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1answer
513 views

How to add website link to erc20 token on etherscan.io

How can we add this official site link to our deployed contract? Like in the image below: Here is my deployed contract address: https://etherscan.io/address/0xab73a739729a21b2299761408507556d2719af89#...
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3answers
214 views

Transfer ERC20 Token feeless

Is there an existing Smart Contract implementation, which can public signed transactions of ERC20 Token transfers? I like to give the users of a ERC20 token the ability to pay the transaction fees in ...
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0answers
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How to lock token certain amount of time [closed]

lock token certain amount of time and then automatically unlock the token and transfer to other user.. suppose owner send some token to user and the lock certain amount of time i.e 10 mins now then ...
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1answer
971 views

Time Lock and vesting smart contract

I would like to create a smart contract that will take care of locking and/or vesting funds to several beneficiaries (inputted by the owner of the smart contract). The funds that it will vest and lock ...
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1answer
275 views

How to download the whole transfer records of a token

I want download the whole transfer records of a token. https://etherscan.io/token/0xB8c77482e45F1F44dE1745F52C74426C631bDD52?a=0xd551234ae421e3bcba99a0da6d736074f22192ff. But the default setting is ...
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1answer
202 views

ERC token multiple address sending

Hi is it possible to send token XYZQ to two addresses in one transaction. here is example. 100 XYZQ ===> 99.9999 to XYZQ 1 address and 0.0001 XYZQ to second XYZQ address? For same amount of gas
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2answers
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burn, freeze, unfreeze functions

I wonder what is the purpose of these functions? could you please provide me with some examples. function burn(uint256 _value) returns (bool success) { if (balanceOf[msg.sender] < _value) ...
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1answer
234 views

Invalid type for argument in function call

I have this token code pragma solidity ^0.4.19; contract MyToken { mapping (address => uint256) public balanceOf; function MyToken(uint256 _supply) public { balanceOf[msg.sender] = ...
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2answers
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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 ...
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2answers
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How can I make my contract send out my tokens?

I've been experimenting with some generic copy-paste codes on the Ropsten Test Net and I am able to create a token and have the creator receive all the tokens. However, when I try to buy these test ...
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3answers
650 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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1answer
127 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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2answers
269 views

Questions Regarding Creating New ERC20 Token & ICO

Hi I want to create an ERC20 token and launch an ICO. I am new to ethereum solidity. I have checked smart contracts on http://ethereum.org and https://theethereum.wiki/w/index.php/...
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2answers
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Is it possible to circumvent a require statement if the ordering of the requirements are incorrect?

Please take the following hypothetical code as an example mapping (address => uint256) public accountBalance; function deposit(uint256 amount) public { accountBalance[msg.sender] = ...
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2answers
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What is the difference between these 2 smart contracts?

I noticed some smart contracts have there name,symbol, and supply set up like this example #1 and setup a defined constructor. Notice, they did not fill in the "string public symbol", "string public ...
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1answer
31 views

Unable to invoke smart contract function from Web3j contract wrapper

I've been learning about interacting with smart contracts through Android and the Web3j framework but have run into an issue. I'm trying to mint an ERC721 token and send it to an address but it doesn'...
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23 views

What triggers a transaction to be recorded on the Blockchain?

I am new to blockchain development. I am trying to understand where, when, and how a transaction is sent to the blockchain to be recorded. Here is the sample code I am studying: pragma solidity ^0.4....
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2answers
483 views

Ethereum Solidity Contracts w/ Fiat Money

Is there anyway to fix a price for a ERC20 token? It seems like a major problem with blockchain and crypto is all of the volatility, which is why I am hesitant to use it for applications even though ...
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2answers
509 views

How to peg value to token outside ethereum

I have an online game system. I issue some tokens through ethereum. How can I peg value of the tokens issued on ethereum to my game system, which is outside the ethereum eco system. (ie) The users ...
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1answer
993 views

how to call smart contract function in C#.net core

protected async void Page_Load(object sender, EventArgs e) { var senderAddress = "0x605a1f8d368cbdd4d0a5cbad74f75c428660f17b"; var password = "zxcasdqwe123"; ...
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2answers
1k views

How to make full smart contract token?

I want to make my smart contract, but I have some questions. for example my new coin name is : Ghost and it's based on Eth. how much ETH should I have in my wallet to create this smart contract? ...
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1answer
688 views

Custom tokens disappear after closing Ethereum Wallet

I'm on Ethereum Wallet 0.9.0 and I need to add the ICO token addresses every time I restart the wallet. The custom token(s) don't get saved after I exit the wallet. How do I solve this?
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1answer
797 views

ERC20 Token Mist 0.9.0 . Balance not showing up

I am running Ethereum Wallet and Mist 0.9.0 (released this on 24 Jul ). ERC 20 token balance is not showing up even if Watch contact is in place. On the other hand, I can properly see ERC 20 token ...
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3answers
432 views

Sending Tokens from MyEtherWallet

I purchased some FunFair tokens today and sent them to MyEtherWallet. I now want to send those tokens back to an exchange and don't have any Ether in my account. I had no idea I needed 0.001 Ethereum ...
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2answers
489 views

Consolidate Batch of ETH Wallets w/ERC20 Tokens?

I have a large number of Ethereum wallets with small amounts of ERC-20 tokens in each. How can I send all of these tokens to a single ethereum wallet without doing this process manually? (it would ...
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2answers
838 views

MyAdvancedToken Automating Selling and Buying function not working

I attempt to create a token with the "automatic and selling" function as describe here. After having copy/paste the code (footpage)and deployed the contract no error message appears. But when I ...
2
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1answer
430 views

How do I find my DBET tokens in MyEtherWallet?

I mistakenly bought DBET tokens directly from my Exodus wallet. I used the public key of Decent.bet (DBET). I assume I should be able to find/see my DBET tokens in MyEtherWallet, but I do not know ...
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1answer
243 views

Token Factory total supply is missing

So I created a token using Token Factory. I hadn't used it before and wanted to test things out, so I did this on the Ropsten Test Net. I was able to successfully publish the contract, which shows ...
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3answers
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Can I receive ERC20 tokens on my address hosted on Coinbase

I have an account on Coinbase and have an ETH Wallet with them. If someone sends their ERC20 token, will there be any issues receiving it?
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2answers
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How to find the coin/token type of crypto payer in Ethereum blockchain?

I'm new in Ethereum based crypto concepts. I would like to know how can I differ the incomming crypto amounts based on their orginal token type? Imagine I have an address on Ethereum blockchain. ...
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3answers
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Custom smart contracts transfering tokens

I have two simple questions. Does all the smart contracts that creates ERC20 tokens have the same function names like balanceOf and transfer? Or developer select those names as they want? Lets say i ...
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1answer
18 views

Automate token distribution?

How can I execute a function on a smart contract from a web-app backend? (Laravel / PHP) My smart contracts holds X tokens. In my MySQL database, users are owed X tokens. I have their wallet ...
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1answer
54 views

Token migration and IDEX smart contract problem

During a recent token migration from token A to token B, a large number of token A were held by a number of people in an IDEX address (where it was ready to trade). The IDEX address is part of a smart ...
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2answers
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What is the difference?

I noticed some smart contracts have the wallet address of the creator in the smart contract to send the tokens to the wallet like example #1: Example #1: constructor() public { symbol = "...
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1answer
1k views

I sent PRL token to contract address instead of wallet address

I am wondering if i can recover the tokens. I sent PRL tokens to contract address 0x1844b21593262668B7248d0f57a220CaaBA46ab9 instead of myetherwallet address from kucoin exchange wallet. :-( Are ...