Questions tagged [crowdsale]

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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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3answers
290 views

How can I code a crowdsale contract to send all unsold tokens to a specific address?

From my understanding of smart contracts it would seem that there is no way to set a specific function or action to trigger itself after a certain time, is this the case? Is the only way to allocate ...
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3answers
584 views

Using Openzeppelin's crowdsale contract as a base, how can I set the rate to be a decimal number?

For example if rate = 10 then for every wei the buyer gets 10 "token units" which are each 1*10^18 of a full token (as the default decimal for the erc20 token is 18). If I want the users in a ...
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3answers
1k views

How to make ERC20 tokens non-transferable until a certain date?

I want to create a token is not sellable or transferable until a specific date (so that only initial buyers can buy tokens, but they should not sell tokens until ICO is completed), what would be the ...
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1answer
138 views

crowdsale contract errors

Below is the script that i have written but i cannot run it, i get some messages( the order of the messages that I post is first the ones i get for the IERC20 and then for the AAAtoken), first is the ...
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1answer
444 views

How to create a different contract for private and ICO?

Is it possible that the Total supply is created at the time of creation of token for Privete-sale and then create an ICO contract for the Unsold tokens to sell them on crowdsale? (i.e. It is hard to ...
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2answers
184 views

Receive ether from one address and transfer tokens to another [closed]

I am starting a crowdsale and I want to add a custom function to my crowdsale contract. Basically I want users to be able to purchase tokens for fiat and bitcoins. In order to make that work I will ...
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1answer
252 views

How can I use token functions of an ERC20 token bought in a crowdsale in Ethereum Wallet?

I am using Rinkeby in Ethereum Wallet and have created a crowdsale contract which created ERC20 tokens, assigned the crowdsale as the owner and then sold them to addresses which bought them using the ...
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1answer
754 views

If a contract's function calls a function of another contract within it, is the address of the contract the msg.sender?

For example, a crowdsale contract has a function that creates an ERC20 token called "token" using a token contract that is already defined further up in the code being deployed. The constructor ...
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2answers
543 views

Why this code gives me this error. Please help

Code is pragma solidity ^0.4.18; import 'https://github.com/OpenZeppelin/zeppelin-solidity/contracts/token/ERC20/MintableToken.sol'; contract HashnodeToken is MintableToken { string public name = ...
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1answer
194 views

How are price changes based on time implemented in crowdsale smart contracts?

How can I implement a price structure into a crowdsale smart contract so that a price per token would be increased after a certain time? I want to use best practices for this but cannot find ...
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3answers
302 views

CrowdSale basic contract sample showing Gas limit error

Hello I have copied Basic contract from official website https://ethereum.org/crowdsale I'm beginner in Solidity and Ethereum development It was successfully compiled by Remix but when I click "...
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0answers
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What is the reason for make a wallet with 1 token during ICO?

Because of my inexperience, I don't understand why (I guess for security reasons) contract owner of a crowdsale split its tokens over several owners, one of them with a 1 token only. For example ...
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2answers
400 views

Unable to update state variables of inherited contracts

I'm trying to write an extension of OpenZeppelin's CappedCrowdsale to allow for a hard cap in USD, as I think this is more human-readable than having everything in wei. However, I'm having issues ...
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1answer
51 views

How to provide more tokens for the amount of ether you send in a crowd sales contract?

So I created an time ratio crowd sale contract based on a token with a set initial supply and no mint function. I publish this contract and then send the associated tokens to the contract. I can send ...
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3answers
332 views

How do I pass a token as a constructor parameter for a Crowdsale contract

I am trying to modify the OpenZeppelin Crowdsale.sol contract for my own purpose and in the constructor it takes a token. function Crowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, ...
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1answer
1k views

How to use payable to receive ethers?

I'm new to the smart contracts. I want to create a contract which accepts ether and will transfer the equivalent tokens to the sender ether address (crowdsale). after few days research, i was written ...
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2answers
489 views

Remix Gas limit exceeded regardless of how high I set it

I am deploying a crowdsale contract in Remix but no matter how high I set the gas limit (set it to 40000000 once) or even how much I change the value field I can't get this contract to not exceed the ...
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1answer
121 views

Placement of addresses in Crowdsale contract

Im stuck with a crowdsale that needs to be deployed tomorrow! Already created token and now just want to crowdsale. So tried several examples- ethereum.org,zeppelin, github and all but they dont seem ...
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1answer
534 views

how to define start time and end time of crowdsale in constructor

I am pretty much stuck with my crowdsale contract. I think i am missing the correct entries in the constructor like time and rate. Can someone help me on how to fill in the correct values? I am ...
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1answer
361 views

How To Add a Function In Contract

I created this very simple contract, but upon testing it, i found out that when there are no tokens to be sent when ether is recieved, the contract ceases to ether and theres no way to retrieve it. ...
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1answer
171 views

ERC20 Crowdsale, Tokens per ether

I am using the zeppelin-solidity. Where is the setting how many tokens you receive for 1 Ether? And where can I set my Ether account as the receiver account? Thanks
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1answer
328 views

Simple crowdsale

I want to do a simple crowdsale for lets say 500.000.000 tokens. For 1 ether you will get 100.000 tokens. 20% will be holded by me, others goes to crowdsale. What wont be sold, it will be burned. I ...
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1answer
87 views

Verified smart contract says beneficiary and token address 0x0000

I just deployed a token crowdsale contract here https://ropsten.etherscan.io/address/0x043acaa777f3e08d0b25d48c899a681a7a17db37#readContract When I read smart contract, the tokenReward and ...
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1answer
145 views

Crowdsale end time

Question about setting crowdsale end time. Is it possible to have an adjustable end time? Meaning there's no end time set, and admin can end the crowdsale any time once the crowdsale started.
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1answer
304 views

Creating a crowdsale with three features for a contract?

I'm currently trying to create a Ethereum contract. The thing is I'd like to set a crowdsale for this contract with certain features: Deadline (42 days). Bonus period Start at 30 % and decrease ...
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1answer
418 views

How do I Withdrawing ehter from crowdsale contract to my wallet?

problem: When the crowd sale ends the contract is funded with the ether contributed but it is not sent to the beneficiary address. How do I get the ether out of the contract so that it can be used by ...
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1answer
74 views

crowdsale contract on my Ethereum Wallet for windows

I first created a token without difficulty with Ethereum Wallet can be see here: https://etherscan.io/address/0x926351469a1a97Ca5AB9b80928a0Ba01493d39F9#readContract. Now I'm trying to do a ...
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3answers
4k views

Error encountered, bailing. Network state unknown. Review successful transactions manually

Problem I get the following error after running $ truffle migrate --reset: Running migration: 1_initial_migration.js Replacing Migrations... ... ...
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1answer
227 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
310 views

Gas issue on remix

I need your help, please. I've been trying to deploy a simple token and crowdsale contract that creates the token on remix, but when I try to deploy the crowdsale contract, it tells me gas exceeds the ...
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2answers
369 views

How to create unique contribution addresses for a referral system by smartcontract

I ran into some trouble with my smartcontract. I want to be able to allocate referral tokens to each person who participated in the ICO referral program. In order to do this, the smart contract must ...
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0answers
468 views

Withdrawing ether from crowdsale contract, issuing the right amount of tokens

I'm trying to create a crowd sale contract and have run into two issues that I can't resolve/find the answers to in the forums or documentation despite searching for the past two days. I imagine its ...
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3answers
204 views

Publishing two contracts

I'm going to publish two contracts: a standard token contract and a crowdsale contract. What is the best practice for this? Should I publish it in one file? Does it mean only the second contract in ...
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1answer
387 views

(node:207476) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1):

Here is where error appears: > Using network 'ropsten'. > > Running migration: 1_initial_migration.js Deploying Migrations... > ... ...
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1answer
321 views

Mist - Rinkeby Test Net - No Longer Sending Confirmations

Im sure this is a very simple problem that one of the brilliant geniuses on this site should be able to answer! I have been testing a sample crowdsale using the Tutorials on https://ethereum.org/...
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0answers
506 views

Token and Crowdsale contracts address problem

I'm testing the creation and deployment of ERC20 token + Crowdsale based on Open Zeppelin on the Rinkeby testnet using Truffle + Geth. The deployment went fine it seems, and through Metamask I was ...
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1answer
436 views

using existing token into a crowdsale

i'm trying to test a crowdsale with a already existing token with fixed supply. I have my token already in place and everything is working just fine if i used the account to transfer my tokens but i ...
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1answer
356 views

Ethereum Crowdsale Tutorial - Can't Transfer Ether to Crowdsale in Solo TestNet - The Contract Won't Allow This Transaction to Be Processed

Im sure this is a very simple problem that one of the brilliant geniuses on this site should be able to answer! I am following the tutorial for Crowdsale found on the Ethereum website https://www....
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1answer
303 views

Can someone explein me this Multi mint function (Solidity)?

I came accross this function to mint token for a crowdsale but I don't understand the meaning of the bit shift operations and what bit array should represent.. what is this code doing ? The code can ...
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1answer
190 views

How does crowdsale contract with lots of tiers work?

Hello :) I'm really interested in knowing how crowdsale contracts with tiers are made. ICOs these days have crowdsale for different tiers with different prices for each.. Like PreICO, Round 1, round 2,...
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1answer
306 views

basic ethereum zepplin crowdsale smart contract token rate question

A basic question on how zepplin solidity code calculates token rates. The code comments say // how many token units a buyer gets per wei uint256 public rate; however we cannot get it to serve back ...
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1answer
287 views

Ending a Crowdsale Contract Before End time

I have generated a crowdsale contract with start and end date time. I want to add a CROWDSALEend function. This function will end the crowdsale before end time if the goal is reached and the function ...
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0answers
213 views

Can't Send ETH to Crowdsale in Ropsten

I'm trying to test a token sale contract on the Ropsten test network but am having an issue. I am using Ethereum Wallet. I am following the guide at http://www.ethereum.org/crowdsale. I am getting ...
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1answer
609 views

Crowdsale Tokens

Saw your question about holding of tokens in a crowdsale, and now see its better that ICO contract holds all the tokens. Appreciate your help. How do I allocate all the tokens in owners wallet to the ...
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2answers
2k views

Pre-sale tokens locking mechanism

I was looking into the ERC20 Token Standards and Crowdsale. There are various sample contracts including the one from OpenZeppelin which exhibits locking the token transfers until the crowdsale is ...
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1answer
91 views

Please check this test token

This smart contract is properly deployed on Rinkeby. https://rinkeby.etherscan.io/token/0x551b092ae227414c5cf7c7e11e70c252e95bedf0 Questions: Why on MetaMask the Beneficiary account address (...
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2answers
258 views

Finally my first Token - questions

I finally could create my first test token on Rinkeby. Smart contract is deployed, buyer can send ETHs, the Receiving address receives funds... Contract address. https://rinkeby.etherscan.io/token/...
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1answer
144 views

Statements have no effect

These entries show Statement has no Effect issues. WHy so? The entries have "Statement has no Effect" problems startTime = _startTime; "1513683938"; endTime = _endTime; "1513687538"; ...
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1answer
801 views

Contract final touches. Problem with CappedCrowdsale

I am finalizing this basic but clean Crowdsale code. However, there is ParserError with "contract Cappedcrowdsale". Why? It does refer to Crowdsale though. Please check if this is a legit Smart ...