Questions tagged [tokens]

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

Filter by
Sorted by
Tagged with
1
vote
2answers
53 views

How can i know my smart contract , compilar version.I cant verify my contract properly

I want to know compilar version of my smart contract.(https://i.stack.imgur.com/6K5sM.png)
1
vote
1answer
1k views

Should INITIAL_SUPPLY & totalSupply be returned in Wei?

I was wondering if a token implementing ERC20 should return Values in Wei or Ether. Assuming I'm creating ABC token with a 100000 Token Supply & 500 ABC = 1 ETH. In the ERC20 protocol, for ...
0
votes
1answer
1k 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 ...
3
votes
2answers
1k views

Recieve payments in Ethereum ERC-20 tokens in web-services

I want to receive payments in my web-service in ethereum tokens, for example, Eos or Rep. And, of course, I must provide each user with different addresses for payment to determine who is the payer, ...
3
votes
1answer
1k views

How can I bridge public and private blockchains or smart contracts?

I want to create an ERC20 based token for an upcoming ICO and bridge this somehow with our private blockchain. Creating the token was easy enough and I can do this part. The team plan to get the ...
2
votes
2answers
2k views

How to deploy a simple hello world smart contract on mist platform with 0 ethers

pragma solidity ^0.4.11; contract raman { address owner; /* Constructor */ function raman() { owner = msg.sender; } function kill() { if (msg.sender == owner) selfdestruct(owner);} } ...
1
vote
1answer
1k views

Where are tokens stored?

I am trying to create my own token and confused a bit. As I understood from the documentation all information about adresses and tokens amount is stored inside contract (ERC20 - mapping(address => ...
0
votes
2answers
505 views

I'm getting a Parser Error: Expected token Comma got 'Return' return contributions.length - 1; ^

function contribute() public inState(State.Fundraising) isMinimum() iinMultipleOfPrice() payable returns (uint256){ uint256 amountInWei = msg.value; contributions....
1
vote
1answer
2k views

Subscribe to all token transfers for entire blockchain

I am looking how to subscribe to all token transfer events within entire blockchain. I wonder how is this is implemented on etherscan.io https://ropsten.etherscan.io/tokentxns I searched thought ...
0
votes
2answers
449 views

Transfer token to wrong adress that have been created by the transaction

I have used etherdelta to transfer tokens instead of the withdraw option and they transfer tokens from my personal wallet to a new one that doesn't exist .The destination adress (automatically fill on ...
2
votes
2answers
5k views

Get the value of ERC20 tokens transferred using the Etherscan API

I am using Etherscan API to get transaction and other details for addresses. I need to find out no. of tokens transferred between two addresses. For Ex - for Below TxHash I see 1564+ tokens ...
1
vote
1answer
132 views

What are the “basic features” of tokens that allow the Wallet to display them?

Here it says: Since all tokens implement some basic features in a standard way, this also means that your token will be instantly compatible with the ethereum wallet and any other client or ...
0
votes
1answer
740 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?
2
votes
1answer
456 views

Sending OMG tokens fails with Bad Instruction

I'm trying to send OMG tokens using MyEtherWallet's offline transaction and getting an error just like this one: 0x084284cb471d3b413ebbbcc5373f1108e3c084e57529f2cfaf8c490117c1a9d1 The gas limit there ...
2
votes
1answer
1k views

Cannot read property 'match' or undefined truffle console

I want to interact with my contracts through truffle console. I am using test rpc and web3. Basically for a standard token contract: contract Token{ function Token() payable{...} ...
1
vote
1answer
968 views

Why there are 'OUT' token transfers from the zero (0x00…) address?

There are no 'OUT' transactions with ether (link), but there are a lot of token transfers (link). In my understanding, most likely no one has a private key for this address, so where do these ...
0
votes
3answers
471 views

Is it possible to create an erc-20 compliant token with a built-in timed release escrow? [closed]

I would like to build a smart token that can readily be used with existing wallets. The objective is a seamless UX for buyers and sellers without complex data input requirements. Transactions by those ...
6
votes
3answers
4k views

Interacting with a deployed contract: How can I mint a token based on the Open Zeppelin Standard

Please excuse what seems to me a basic question, as I am very new to this: I'm using the truffle framework to deploy a smart contract. Playing around with Open zeppelin standard tokens, I've issued ...
0
votes
1answer
503 views

How to monitor token flow after crowd-sale?

I have created a token with Token name as TestToken and Symbol as TTT for crowd-sale. During Crowd-sale I have transferred TTT token to my investors say Bob. After crowd-sale, he (Bob) transferred TTT ...
0
votes
2answers
123 views

Ethereum Token Nam Redundancy

I have created a ERC20 token in ethereum blockchain with token name as TestToken and Symbol as TTT. Now how can I ensure that others cant create a token with the same name and same symbol? Is there is ...
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 ...
2
votes
1answer
4k views

How Ethereum token transfer works

Does an account get actual tokens when you call a transfer function in an Ethereum token contract or is it just a balances mapping that registers how many tokens each account (address) has? I am ...
2
votes
4answers
4k views

ERC20 Ropsten - how do I view the token balance?

I've published crowdsale contract to the Ropsten test network and it is located here: https://ropsten.etherscan.io/address/0x5b15b8f8238b9ec9e9c50e9f9bfcee6073349a96 I've struggled with ABI-encoded ...
0
votes
1answer
323 views

user api to exchange eth token and wallet address creating using code

Is there any API to help exchange ether or tokens online which will help in coding an exchange. For bitcoin one can generate a wallet address, is it possible to generate a wallet address for Ethereum ...
3
votes
2answers
2k views

How to access a token instance created by another smart contract constructor

I am using a smart contract which creates a token instance in its constructor: contract Exemple{ Token public myToken function Exemple(){ myToken=Token(this); } }...
3
votes
1answer
723 views

Is it safe to use ERC223 Tokens?

ERC20 Tokens are currently used in more than 90% percent of new tokens. At this point, is it a good idea to use instead ERC223, or should be test it further? Any real example of ERC223?
1
vote
1answer
96 views

Approval + Deposit each time, vs a one time Approval then only Deposits after

I've noticed that some token contracts are requiring me to do an approval before I make a deposit and some do not. For example. SNT and CVC do not require me to do an approval before I deposit. ...
2
votes
2answers
354 views

How to make payable function to receiveTokens and not ether?

How to make payable function to receive tokens and not ether?
0
votes
1answer
298 views

Please help! I don't know how to access the BLX I sent to MyEtherWallet - it says 0 balance but it shows on blockchain

I bought some BLX on EtherDelta, withdrew from contract to my EtherDelta wallet, then clicked "Transfer" and transferred all of my BLX to a MyEtherWallet address. Later I got confirmation that it ...
3
votes
1answer
100 views

Link between ICO, Mining and the Technology platform

this is not a question about markets or how to mine, but rather about the lifecycle of a coin on the platform. WHY would anyone purchase coins on an ICO? Is the aim to pick an ICO that might just hit ...
4
votes
1answer
212 views

How can we trust Substratum tokens if they are not open source?

Substratum is a token that is going to be used to pay people to run decentralized web servers. Presumably their tokens will have functions that their as of yet undeveloped webserver code will ...
2
votes
0answers
649 views

Ethereum ERC20 token at fixed value [duplicate]

I am new on this area. I am trying to create an ERC20 token with a fixed price per token such as USDT. In other words, there is any way on the contract to issue my token to establish a constant price ...
1
vote
0answers
342 views

Will people still be able to see my smart contract code if I make the functions private? [duplicate]

I am interested in knowing if someone can read the code for my smart contract after I deploy it to the live ethereum blockchain. If I make my functions private. The goal is to hide the code.
4
votes
1answer
3k views

Smart Contract with stable coin

Is there any stable coin, which can already be used with smart contracts? If not, is there a possibility to exchange a stable coin in real time into a smart contract feasible coin like ETH by help ...
8
votes
2answers
6k views

Is there length limits on Token Symbols?

Is there a limit on the length of a ERC20 Token symbol? I would like to use 4 letters, one of which is lower case, but that isn't an issue. My concern is if Exchanges have setup their tools to only ...
1
vote
0answers
678 views

Calculate ERC20 token distribution [closed]

I'm tasked with determining the current distribution and live wallet stats of a particular ERC20 token. My experience with Ethereum development is largely with web3js, and have a strong idea on how I ...
0
votes
1answer
1k views

What is “could not unlock signer account” error when sending tokens to an ERC20 token contract using transferFrom()?

I'm using testrpc -u 0 -u 1 to start the local testnet, deploying my OpenZeppelin Standard Token smart contract with truffle migrate, and using web3 in my dapp. As the user, I perform an action that ...
1
vote
1answer
189 views

Are crypto-token holders disincentivized to spend their tokens?

Are holders of crypto-tokens that have real utility within a specific application disincentivized to spend their tokens because they fear that the value of the tokens will go up after they spend them? ...
0
votes
1answer
57 views

How should a new service decide whether to launch with a crypto-token economy or not? [closed]

Outside of the obvious ICO bubble and the ability to raise tons of money, what is the core value proposition of establishing a crypto-token that users can use within your service? For anyone ...
-1
votes
1answer
761 views

How to copy bytes of two input strings and concatenate them in Solidity? [duplicate]

I read on a few other posts with solutions similar to my question but none of them seemed to work when I compiled them on solidity. I am trying to simply add two strings and return the value. ...
4
votes
1answer
3k views

Max possible ERC20 Tokens allowed with 18 decimals?

I would like my token to have the maximum possible amount of tokens issued as a novelty. I would like to use 18 decimals standard ERC20 token, what value can I put in to get the maximum amount of ...
0
votes
1answer
521 views

Maximum ERC20 Tokens?

What is the limit to the amount of ERC20 tokens someone can generate? I tried to generate 1 Trillion tokens but only got 0.000001 Tokens back! If anyone can make this more clear, I would highly ...
1
vote
1answer
878 views

How to send Token (not Ether) through a contract?

I know sendRawTransaction can send Ether to another account address. Now, I need to use sendRawTransaction to send Token to another account address. In sendRawTransaction, the param to should be the ...
1
vote
1answer
547 views

EOS tokens disappeared

I bought 73 eos tokens using metamask a month ago. I was always able to see the tokens on metamask till today, when they disappeared. I can only see them on the EOS distribution App now.
2
votes
1answer
788 views

In an Ethereum smart contract, can I check the balance of other ERC20 tokens from the sending address of a recieved transaction?

I'm currently designing a smart contract, where I'd basically like to incorporate a "coupon" like relationship between two different coins. Bob can send the smart contract CoinA, and receive CoinB as ...
0
votes
1answer
328 views

Can my dapp charge tokens without asking for user permission?

For instance, say clicking on a button will perform some type of action and it charges the user 1 token, but doesn't show any pop-up dialogs. I don't want a Metamask window opening up to submit a ...
0
votes
3answers
548 views

Required api's for crypto token wallet

I am creating the api server for creating the interaction with crypto token smart contract , i want to know the required api's through which i can perform basic functionality of sending and receiving ...
0
votes
3answers
223 views

Allocating unsold tokens at the end of a crowdsale to a specific address

I am using Open Zeppelin Token and Crowdsale contracts. What should I do such that at the end of a crowdsale, the unsold token amount gets allocated to a specific address that I own? Currently, the ...
1
vote
1answer
2k views

How to call Token function & transfer owner does not change owner

I copied and modified smart contracts from TenX and EOS. Below is my code. From the sale contract, I'm able to execute functions in the token contract, like the way TenX has, such as token.mint(...
2
votes
1answer
152 views

Can't transfer more than 9007000000000000 tokens at once?

I'm using the Zeppelin ERC20 code and I can't seem to transfer more than 9007000000000000 token "cents" at a time. Address a has a balanceOf 1000000000000000000000000 (10 million tokens * ...

1
29 30
31
32 33
36