Questions tagged [crowdsale]

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My Crowdsale contract wont transfer ERC20 tokens and all transactions fail

I have a crowdsale contract that recieves tokens directly from a mint function in my token contract.the function mints the tokens and sends its to the Crowdsale account address. when I run let token = ...
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24 views

Ether Transaction failed to crowdsale contract

I have deployed a token on ropsten. it works and i can transfer tokens. Now i deployed crowdsale contract but when i send ether to crowdsale contract the transaction fails. I am using remix and ...
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2answers
42 views

“VM Exception while processing transaction: revert” in Truffle test and Truffle dev

this is my problem :) Issue "Error: Returned error: VM Exception while processing transaction: revert" when reaching the Transfer function. I think it is related to the fact that my Crowdsale smart ...
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1answer
72 views

Openzeppelin Crowdsale

Ok so Ive found Openzeppelin a slightly easier Code to use, it explains better than Solidity does. But now my problem is the Math bit. Im no mathematician neither and cannot get my head around how it ...
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26 views

Token transfer lock after crowdsale

I am faced with a problem regarding the ICO and Token smart contracts (SCs). I am currently using OpenZeppelin SCs to create my token and ICO and everything is working fine. Now I would like to add a ...
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1answer
49 views

Solidity error message on compilation (DeclarationError: Identifier not found or not unique. using Address for address;)

I'm trying to compile a code for a crowdsale contract (Timed and with allowance) from openzeppelin library that is based on a deployed token. However during compilation on remix i get a syntax error ...
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1answer
33 views

How to deploy more than one contract with Remix

I'm trying to deploy my contracts with Remix to Ropsten, but I don't know how to do it. Can you help me? (I have a ERC20 token contract, and a CrowdSale contract)
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1answer
69 views

How to get tokens for crowdsale from the main token contract

Trying to deal with Ethereum contracts using OpenZeppelin examples and Remix. There is a token contract deployed in the test network: pragma solidity ^0.5.0; import "./ERC20.sol"; import "./...
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1answer
38 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
34 views

Using an ERC20 crowdsale for a non-Ethereum based coin

I am confused as to how a crowdsale works. If in a crowdsale, people give their Ethereum to a new coin to be entered in a smart contract. Doesn't that mean that the receiving end of the contract (...
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1answer
733 views

error: VM Exception while processing transaction: revert SafeMath: subtraction overflow on migrating crowdsale conract

I am developing the token sale Dapp using openzepplin-solidity version 2.3. While migrating, I got the following error. Returned error: VM Exception while processing transaction: revert SafeMath:...
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1answer
85 views

ERC20, how to calculate how many tokens for crowdsale?

If you look at this article, the total tokens for crowdsale is 100 tokens and defined in the code as uint256 public maxTokens = 100000000000000000000; how come 100000000000000000000 becomes 100 ...
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1answer
69 views

Remix error : Function declared as view but this (potentially) modifies state

i'm following a tutorial but now it is old, because was written more then 1 year ago, with 0.4.24 pragma and i also want upgrade this code. I got this error and i'm pretty sure to know why: view and ...
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1answer
53 views

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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2answers
103 views

Remix: This contract does not implement all functions and thus cannot be created

I'm new here and code with openzeppelin framework 2.2.0. There is no error occurred when compiling with solidity 0.5.8. But when I'm going to deploy the contract, I have no bytecode and cannot ...
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0answers
14 views

Is it possible to do vote and participate in crowd-sale using Forwarder address?

Currently, I am using Metamask (Ropsten TestNet). And I want to implement one voting cum crowd-sale process, the scenario is given below: Want to make the voting process in this if Voter is voted to ...
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1answer
64 views

What DSAuthority(0) and eos.owner() means and does?

In ERC20 EOS crowdsale contract, what these three lines(469-471) does? function initialize(DSToken eos) auth { assert(address(EOS) == address(0)); //[Someone explained this line here][...
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1answer
973 views

Invalid implicit conversion from address to address payable requested

first of all really nice to find this forum, I'm starting coding Solidity. Here the problem I get compiling a template of crowdsale smart contract ExampleTokenCrowdsale.sol, from this tutorial. The ...
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1answer
19 views

Is it likely to receive more token airdrops to one of the original Ethereum addresses from the crowdsale?

Is it likely to receive more token airdrops to one of the original Ethereum addresses from the crowdsale? Hi there, I participated in the original Ethereum crowdsale and I used to store a certain ...
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54 views

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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1answer
261 views

Sell tokens to a contract and burn them after

The goal is to make a crowdsale smart contract where investors can buy tokens (no cap, no initial supply, all tokens are minted) and sell them to a contract for some price (rate in my case). And I ...
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2answers
59 views

Make a crowdsale reusable?

I have a pretty standard OpenZeppelin crowdsale. Now the issue is that I want to be able to use one crowdsale contract with multiple (~100) different ERC20 tokens. Ideally I want to put the ...
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1answer
55 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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2answers
95 views

(Truffle) how to call finalize() function after finishing crowdsale

I would like to call token.transferOwnership(msg.sender) after finishing timed crowdsale. So, I inherited FinalizableCrowdsale contract, then override finalization() function to call transferOwnership ...
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0answers
67 views

How to get back the ownership from crowdsale?

When I started crowdsale, I transferred token ownership to the crowdsale contract. When the sale finished, I'd like to send back the ownership to token so that the next crowdsale will start. How can I ...
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1answer
367 views

Error in creating instance of deployed contract using truffle console

I deployed Token and Crowdsale contract in separate migration files. During Migration, there was no error. Migration logs are share: Running migration: 2_deploy_token.js Deploying DappToken... ......
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20 views

integrate icoengine into zeppelin crowdsale contract

I have the following functions // from https://github.com/eidoo/icoengine/blob/master/contracts/KYCBase.sol function buyTokens(uint64 buyerId, uint maxAmount, uint8 v, bytes32 r, bytes32 s) public ...
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1answer
68 views

Must token contract transfer all tokens to crowdsale contract before it can sell them?

I notice that on the standard tests for crowdsale contracts in Openzeppelin, they transfer the tokens from the Token contract to the Crowdsale Contract: context('once deployed', async function () { ...
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1answer
57 views

I want to remove the timed aspect of this crowdsale contract and make it finalizable manually [closed]

Which lines do I remove and what do I replace them with to change this from a timed crowdsale contract into one I can end manually? pragma solidity ^0.4.18; interface token { function transfer(...
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1answer
1k 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
405 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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2answers
187 views

Crowdfunding Contract like Kickstarter

I was following a tutorial for a Crowdfunding Smart Contract that acts like Kickstarter from Programtheblockchain, however I'm always getting a MetaMask Error which says "Exception thrown in Contract ...
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1answer
94 views

Refundable Crowdsale

I am trying to create a contract for crowdsale using OpenZeppelin lib. I have imported everything necessary to the contract and initialized everything properly, but when I am trying to deposit funds ...
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1answer
197 views

CappedCrowdsale of mintable ERC721

I am thinking of building a capped crowd sale using CappedCrowdsale and MintableERC721 of OpenZeppelin. I wonder if its better to mint the tokens once the cap is reached or to mint seperately once a ...
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2answers
134 views

Create and Run an AllowanceCrowdSale With Zeppelin-OS Contracts

I use the openzeppelin library: https://github.com/OpenZeppelin/openzeppelin-solidity/tree/v1.12.0 token I create a BurnableToken: pragma solidity 0.4.24; import 'openzeppelin-solidity/contracts/...
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1answer
552 views

Ethereum Token Creation & Crowdsale Example

My goal is to create a token and sell it via the crowdsale contract. I used the examples: https://www.ethereum.org/token The code below is the exact same as on the ethereum homepage besides the ...
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1answer
49 views

Can't withdraw from Crowdsale multiple times

I'm using a crowdsale contract (listed below) and on Ropsten network I just set founding goal to 1ETH send it to crowdsale address and then I can withdraw to beneficiary address but when I send ETH a ...
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0answers
156 views

Send ERC20 Tokens from Fixed Supply Token Contract to TokenCrowdSale Contract

For ICO Crowd Sale I have created 2 contracts one is MyToken.sol & other is MyTokenCrowdSale.sol. MyToken.sol creates fixed supply ERC20 tokens. contract MyToken is DetailedERC20, StandardToken { ...
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1answer
85 views

how to create a smart contract that receives funds, displays addresses that sent the funds?

function safeWithdrawal() public afterDeadline { if (!fundingGoalReached) { uint amount = balanceOf[msg.sender]; balanceOf[msg.sender] = 0; if (amount > 0) { ...
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1answer
110 views

Reentrancy Attack on Crowdsale contract with transferFrom method?

I'm trying to build a crowdsale contract for an existing erc20 token. This the function allows users to buy the token: function buyTokens(address _beneficiary) public onlyApproved(_beneficiary) ...
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1answer
36 views

Why am I not receiving '5 passing, 1 failing' after performing truffle test?

After running truffle test i get the following unexpected error: Zanes-iMac:riskxtoken zanemassey$ truffle test Using network 'development'. Compiling ./contracts/Migrations.sol... Compiling ./...
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2answers
180 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
58 views

Direct sale smart contract, is this working without security issue?

I want to make a page for direct sale of my token, just like the one in Loomx, with a fixed token price (changeable later by me) and immediately transfer token to buyer securely after purchase. I try ...
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1answer
161 views

Unable to transfer tokens from another contract

I am learning soildity. I created a fixed supply token. My token supply is 1000000 with 0 decimal places. Now, I want to transfer tokens from using new contract, so I created a new contract named ...
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3answers
663 views

Basic Crowdsale Contract

I am learning to develop smart contract using Solidity. Currently, I am working and test the feature of following crowdsale contract. https://github.com/OpenZeppelin/openzeppelin-solidity/blob/v1.8.0/...
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1answer
100 views

Ethereum crowdsale tutorial code doesn't work on remix

I took the crowdsale code from the tutorial, copied the whole contract code and pasted it to remix (with Rinkeby testnet), and I'm getting straight an error: browser/contract.sol:52:25: ParserError: ...
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1answer
62 views

Cap is not showing actual amount after deploying contract on Main Ethereum network

I have deployed a crowdsale contract with bonus stages on Main Ethereum Network using remix.ethereum.org. I have set a Cap amount of ether in wei as my goal. After deploying contract, I looked into ...
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1answer
194 views

TimedCrowdsale.sol does not implement all functions and thus cannot be created

I found success in deploying Crowdsale.sol on ropsten testnet but I am finding trouble with TimedCrowdsale.sol I am using OpenZeppelin contracts of TimedCrowdsale.sol, SafeMath.sol, Crowdsale.sol, ...
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1answer
112 views

ParserError: Expected event name or path

I have a lot of experience in programming but I'm a noob when it comes to ethereum programming. When I try to compile the code with truffle I have this error: ParserError: Expected event name or path ...
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1answer
182 views

The contract will not compile: Member not found or not visible [closed]

This is my code: pragma solidity ^0.4.23; import "./SafeMath.sol"; import "./MintableToken.sol"; import "./Ownable.sol"; import "./BurnableToken.sol"; /** * @title Crowdsale * @dev Crowdsale is a ...

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