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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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Unable to pass the value to function's parameter in Remix

I am testing a contract which has a transfer function which accepts the array of values and address. It works fine when I pass a smaller value as mentioned in the below transaction. https://ropsten....
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40 views

Safe deploy of ERC20Mintable token and crowdsale contract

I have created the Token contract and the crowdsale contract using open Zeppelin library. After migrating the Token and crowdsale contract, I have added the crowdsale contract address as a minter in ...
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17 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
22 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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1answer
22 views

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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1answer
29 views

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
23 views

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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28 views

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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29 views

Truffle Solidy based testing fails

I am new to testing the smart contract in solidity. Just for my understanding I have used Assert.notEqual in 1 test and Assert.equal in another test. I guess both are failing. I also have a question ...
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13 views

ICO Traffic on Etheruem

Are there any sources that show a breakdown of how much of the traffic on Ethereum is from ICOs? Looking to understand how much of the traffic on Ethereum is due to ERC20 ICOs.
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1answer
19 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
42 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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51 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
46 views

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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1answer
55 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
71 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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38 views

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
66 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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40 views

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
29 views

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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1answer
20 views

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
111 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
111 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
155 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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74 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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22 views

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
40 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
109 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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2answers
187 views

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
40 views

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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1answer
66 views

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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How does the initial token distribution look like on the blockchain?

How to identify the initial token distributions for this token? Where to find them and how do the transactions look like? Also, is it possible to identify who contributed to receive the ERC20 tokens?...
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1answer
152 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
221 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 ...
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2answers
419 views

ERC20 Token Total Supply, When to Mint, When to Burn?

What formula should be used to determine the initial amount of tokens you want to be in your total supply? When does it make sense to mint tokens? When does it make sense to burn tokens For question ...
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2answers
102 views

I have a certain amount of ERC20 Tokens. How can I Create a crowdsale contract that allows me to send them to it to be sold?

I have created previous contracts where the token is created by the crowdsale and then the constructor allocates an amount of those to be transferred to other addresses and the remainder are for sale. ...
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1answer
22 views

Sent Ether to ICO from my Jaxx wallet - How can I get token to show in my Etherwallet?

I've participated in an ICO by sending Ether from my Jaxx wallet, how can I make the new token show in myetherwallet?
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49 views

Pre-ICO and ICO in single smart contract

is it possible to code pre-sale and main sale in a single smart contract with different hard-caps (max tokens allocated for pre-sale), time periods, rates (can be as bonus) and of course, possibility ...
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1answer
171 views

EIP20 and ERC20 not compatiable in token contract?

I am issuing a token coin via ERC20 and I also include a crowd sale within this contract? ie start time end time bonus period total supply ? 8 or 18 public decimals ? I got confused with ...
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42 views

The error “Error: The contract code couldn't be stored, please check your gas amount.” shows up when deploying Crowdsale contract on Ropsten/Rinkeby

I've tried increasing gas to maximum, and tried debugging the code looking for potential issues to no avail. The contract deploy on ganache/TestRPC without an issue. Could anyone help? It's the ...
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1answer
21 views

Least Technical description of an ICO and how it is useful(monetarily) [closed]

I need to convince my boss ( completely not technical, I don't know how that happened ) that an ICO is a good way of generating revenue. I've been trying to compare it to an IPO but I know too ...
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1answer
126 views

How to transfer ico tokens to myetherwallet, Metamask programmatically

I am working on an ICO site. Everything is working fine now i need to transfer ICO token to Myetherwallet and metamask wallet. Please let me know what are the best and possible ways to do this and is ...
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1answer
20 views

About Ethereum password

I joined Ethereum 's ICO in 2014. But I forgot my password. I have a keystore file but I do not know my password... So I am thinking of brute force attack on my wallet. Please tell me the password ...
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1answer
757 views

What is minting? how is minting prevented after ICO?

I am trying to know how ICO works (on a high, intuition-level), somehow it is hard to find information on the following questions. As I understand this minting is the process where you create the ...
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1answer
15 views

Withdrawing Ether to another Wallet Problem

I'm trying to write something like ICO projects do and I got this problem when it comes to withdraw the ether in the contract's balance to my wallet. function withdrawal () public payable { ...
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1answer
124 views

Error on the wei value in Remix

I would like to deploy a smart contract ICO on the testnet (Ropsten) and for that I use Remix. The problem is : if i deploy my SC with value = 0 wei it's okay, but after when I try to do a ...
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36 views

Crowdsale with manual token issuance by owner

I'm working with the OpenZeppelin solidity framework to run a crowdsale script. How would I be able to manually issue tokens for an offline buyer within the script? I created a new function to do this,...
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1answer
72 views

unique deposit address for each investor in ico [duplicate]

How can I create a unique deposit/contribution address for each investor in ICO. Is it possible to do it for both BTC and ETH ?. How can funds be transferred to one mutisig wallet from each unique ...
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unlocking ethereum account [duplicate]

I want to unlock ethereum account for a test ICO on rinkeby.Using geth and I'm struggling to do that. I use command geth --rinkeby --rpc --unlock 0x9eb9afe773757fa175116ae1ba10a23a87fa8f52 --rpcapi ...