Questions tagged [ico]

An ICO, or Initial Coin Offering, is the initial offer of sale of a digital token or asset on the blockchain.

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How to get initial balances for all those who bought tokens?

Is it possible to get the initial balances for all those accounts who bought ERC20 tokens? If that’s possible, how that can be achieved? I’m wondering if there is any way of getting that information ...
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3answers
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transferFrom function not working in ICO Smart contract

I am facing issues with the transferFrom function of smart contract address 0x6560a9b6436e129cf835ab9da96201207facd4f8: I copied the smart contract code from etherscan.io and deployed on ropsten ...
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If I create an ERC-20 token and accept dollars from people in exchange of my ERC-20 token, would this be an asset-backed token?

If I create an ERC-20 token and accept dollars from people in exchange of my ERC-20 token (with 1 token per dollar), would this be an asset-backed token or a security token? The idea is to create an ...
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Dates of ERC20 tokens transactions

I'm an individual who is interested to ICOs which are selling ERC20 tokens. My question is related to an issue that, for most of the ERC20 tokens, the dates of transactions do not fall within the ICO ...
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1answer
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Crowdsale, how to calculate hard cap?

I was reading this article about Crowdsale. Simply, 100 Tokens are to be minted. The author set 60% of tokens are distributed as public sale. To be more specific, 20 out of 60 tokens will be sold ...
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How and Why other should buy and sell my ICO token? [closed]

When I invest or create a token, I am hoping someone in the future will want to buy it at a higher price. Why would anyone buy my tokens to use the platform if the price of the token keeps increasing ...
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1answer
29 views

ERC20 finishMinting() after ICO

When ICO is finalized, I call finishMinting() to prevent from adding new tokens to totalSupply. contract MyTokenCrowdsale is Crowdsale, MintedCrowdsale, CappedCrowdsale, TimedCrowdsale, ...
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1answer
23 views

Where can I find public and known ERC20-Contracts from existing ICOs

In order to list real live example code for ERC20-Token and Crowdsales at a talk about Smart Contracts I'm looking for such projects? Who can recommend me the real GOOD examples out there (and not ...
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1answer
30 views

How to choose contract address and wallet address

When you start an ICO, to receive a fund from people for your ICO, how do you choose the contract address and your wallet address to receive ETH collected for your ICO? Thank you. And excuse me for my ...
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1answer
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problem displaying ico

I created an ICO using ropsten (because I did not have an ETH) and when I search for my ICO on https://etherscan.io, I cannot find it. I can only find it here: https://ropsten.etherscan.io. Is it ...
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How to restrict ICO investors to redeem their ERC20 tokens while not restricting them to trade tokens among themselves?

We want to create an ICO where investors can purchase ERC20 tokens anytime but have to wait for atleast 3 months from the date of purchase in order to redeem/encash them on our platform. But we do ...
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In ICOs why initial supply/total supply tokens are transferred to owner address rather than storing it in the contract itself?

Here I have taken two of the top 20 ERC20 Token/ICO. 1.BNB(https://etherscan.io/address/0xB8c77482e45F1F44dE1745F52C74426C631bDD52#code) 2.BAT(https://etherscan.io/address/...
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Storing ICO tokens in contract address instead of owner address

In most of the ICOs,initially all tokens are transferred to owner address instead of being handled at the contract address.Why?.
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STO using Ethereum

Is anyone here worked on STO using various ERC protocols. Need to get some information about it. Regards, Divansh
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Minted Crowdsale vs Non Minted Crowdsale

I am exploring openzeppelinr-solidity smart contracts for Initial Coin Offering(ICO). There are two options available for a token smart contract one is to have hardcoded total supply tokens or mint a ...
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Which laws have to be followed for an ICO/STO in Europe? [closed]

Which laws have to be followed for an Initial Coin Offering / Security Token Offering in Europe? P.s.: Don't worry, the purpose of this question is NOT to rely on the answers solely. Consultation of ...
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Issue in understanding Crowsale in the ICO contract

I want to create a token and run an ICO but all this without the function of crowdsale and minting. It want it to be a token which has a strict initial suplly (exmpl 1M) and without the funtion of ...
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3answers
127 views

Which ways of distribution of Tokens are being used beside ICO/STO?

Assume, I've created my own ERC-20 Token and published it to the Ethereum Blockchain. By doing so I also got access to all of the initially created tokens. If I'd like to distribute them, the only ...
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Questions on MinterRole contract in openzeppelin

I am using the openzeppelin for creating the ICO contract. I am concerned about the MinterRole here. After I develop Token contract, I added the sale contract as a minter using "addMinter" function. ...
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How to save and retrieve the investors address in a crowdsale contract

I am writing a ICO code which should have the following functionalities To save the address of every investor and To retrieve all the investors address and the amount invested Question What is the ...
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1answer
46 views

Token transfer is not working

I am trying to transfer a token from a token contract. the control reaches till the point where I have the transfer statement later it fails. I do not understand why it is failing. I made sure the ...
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1answer
42 views

Set rate for crowdsale after it has ended

The problem I am trying to solve is how to properly price an ICO. One idea would be to have 10 tokens available. Do the ICO and collect all the ETH. Then after the ICO has ended, divvy up the tokens ...
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How to automatically deliver the tokens in a PostDeliveryCrowdsale

My goal is to deliver the tokens only at the end of the crowd sale. I have seen the below code which can deliver the tokens in a batch. Questions Will this work even when there is a million _to ...
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TypeError: ajtokenSaleInstance.tokensSold is not a function

I am following this tutorial on youtube "Code Your Own Cryptocurrency on Ethereum (Full)" i stuck at one of the part where i am trying to return the value of TokensSold but i keep on getting error as ...
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1answer
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Issue in understanding MintedCrowdsale in the ICO contract from openzeppelin

I am trying to understand the openzeppelin code for writing ICO contract. In MintedCrowdsale, mint() function in ERC20Mintable is called as mentioned below. ERC20Mintable(address(token())).mint(...
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In OpenZeppelin _deliverTokens() from CrowdSale contract is not called

I am using openZeppelin for creating the ICO contract. Could you please help me to understand the below behaviour ? Crowdsale The CrowdSale contract is having the function buyTokens(). It calls the ...
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1answer
62 views

How to specify the Gas price for ICO contract

I am writing a ICO contract in truffle using openzeppelin I used the below code in the truffle.js and I am trying to launch in mainnet. When I tried this I could see that the transaction is using the ...
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1answer
199 views

Altering / overriding the method from main contract

I am using openzeppelin to create a ICO as a CappedCrowdsale and TimedCrowdsale as mentioned in the example mentioned in the below link. Reference : https://github.com/buddies2705/Solidity-Tutorial/...
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2answers
195 views

Escrow account creation in the example ICO contract from openzeppelin

I am understanding the ICO as explained in openzeppelin https://github.com/OpenZeppelin/openzeppelin-solidity/tree/master/contracts/examples When I called the "Buy tokens" the beneficiary is getting ...
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2answers
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Payable function not being called when ether is sent to the contract address

So I modified the ERC20 token a little bit added two extra functions so that my ICO token contract can call it to send some tokens to the people. This is my erc20 token code. pragma solidity ^0.4.24;...
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396 views

Transaction reverted during contract execution [Reverted]

I sent ETH to a contract address, and the transaction "failed" saying : Warning! Error encountered during contract execution [Reverted]. contract address and transaction failure here: https://...
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1answer
241 views

Buy token function does not work in crowd-sale smart contract

I am new to ethereum block-chain. I created a crowd-sale and ERC20 smart contract and deployed on rinkeby test network. The ERC20 token transfer function working fine. But when I check functionality ...
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How to integrate ledger wallet in REACT DAPP? [closed]

i cant seem to find a way to integrate ledger wallet in react DAPP. Like which library to use. Any kind of guidance and starting material would be helpful. Thank You
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2answers
249 views

contract address returning '0x0000000000000000000000000000000000000000'

I am rying to get the address of public variable tokenContract of datatype contract but its returning the address as ''0x0000000000000000000000000000000000000000'' below is the code for the same ...
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ICO for a startup I am planning to build but have some questions [closed]

I am an software developer with over 11 years of experience in industry and has worked as a software developer for some of the leading firms in vacation rental space. I recently started playing around ...
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1answer
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How to optimize ETH donations in an ICO when receiving ETH from an exchange? (Best user experience)

I'd like to make raising funds in ETH as easy as possible. This is the flow that I'm imagining for my average user: 1) User visits my ICO page 2) They download a key and address file generated in-...
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ICO functions & limitations

One thing I try to understand is the limitation of smart contracts. I was looking into ICOs and I always asked a question: Is it possible to implement an 'enterICO' function without requiring ...
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1answer
499 views

what is pausable token in erc-20 openzeppelin

I want to know about the pausable token in openzeppelin.what are the advantages that we will get after making our ERC-20 token pausable.
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1answer
183 views

Is KYC required for all token sale by law? [closed]

I was told that KYC is required by law in most countries. We were Australia based, where ICO should be legal. Do we need KYC for token sale on our website? Or it's depeneds on the country buyer ...
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2answers
316 views

How does token exchange buy and sell ERC20 tokens technically?

I am new and self studying how ERC20 token and smart contract works. After reading through some documents and blogs about creating token and ICO smart contracts. I have questions about how people ...
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138 views

0 ETH Airdrop function with ICO contract

I see many airdrops that have been done by sending 0 ETH to the ICO contract address my question is: how to add this function to the ICO contract with the ability to start and stop at any time? and ...
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0answers
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How would ICO smart contracts function under these scenarios?

Having been inspired by an idealistic desire to attempt a way forward amidst ongoing diplomatic crises, I hired a team to help me create a mega-infrastructure ICO project at Beringia.io - but I ...
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How to integrate myether wallet in ICO crowd-sale application with python web3.py library

I am new to ethereum block-chain. I am learning to implantation of Ethereum decentralise application with python web3.py. I successfully compile and deploy smart contract with web3.py. Now, I want to ...
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1answer
55 views

How end user interact with ICO crowd sale Dapps Application?

I am new to Ethereum blockchain. I have queries regarding ICO(Initial Coin Offering) plateform. I understood basic meaning of ICO. Suppose I have own startup company. I needs funds for development ...
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1answer
129 views

Created Crowdsales contract, sending ropsten ETH to the contract and Failed

I created crowdsale contract - https://ropsten.etherscan.io/address/0xfbb2759ef0b7169d0a2effa971845ea0f99f87b1 My token - https://ropsten.etherscan.io/token/0x0f26c1c05f1bbBC7Eff0488F1a98619e8a9758cf ...
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zeppelinSales contract constructor expected 3 arguments, received 0

I am trying to deploy Crowdsale contract, but when I do "truffle migrate --network ropsten" I get these errors: Running migration: 1_initial_migration.js Deploying Migrations... ... ...
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1answer
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Error encountered, bailing. Network state unknown. Review successful transactions manually. exceeds block gas limit

I am trying to deploy my crowdsale contract using "truffle migrate --network ropsten". I encounter this problem "Error encountered, bailing. Network state unknown. Review successful transactions ...
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How can I redeploy my ico/erc20 token from Rinkeby to the main Ethereum network?

If you know and have a tutorial please attach the link in this thread. My token on Rinkeby looks like this: https://dappuniversity.github.io/dapp_token/
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373 views

How to set the total supply for an ICO contract

I'm trying to create a test ICO contract (simply for the purpose of learning about blockchain etc). I have followed a tutorial and produced the following contract. The total tokens supplied to the ...
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1answer
372 views

How To Read Etherscan Token Transfers

I'm noticing a lot of ether transfers into ERC20 token contracts months after the token's ICO finished. I am wondering how is this possible, and where these tokens are coming from, since tokens are ...