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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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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
50 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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23 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
36 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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0answers
34 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
28 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
17 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
30 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
59 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
78 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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0answers
48 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
19 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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0answers
25 views

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
32 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
104 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
90 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
26 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
45 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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19 views

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
75 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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0answers
22 views

Converting seconds from January 1, 1960 on a smart contract

I need to change the end time of our ICO to December 31, 2018. I remember there is a site that converts seconds from January 1, 1960. Does this sound familiar? TIA, Steven
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1answer
164 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
282 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
89 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
17 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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42 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
106 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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37 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
19 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
114 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
19 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
431 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
14 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
92 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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0answers
32 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
55 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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16 views

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 ...
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1answer
73 views

Is having 1 smart contract for an ICO good practice?

I wrote a smart contract which will be used in an ICO. The contract is an erc20 token but it also provides functionality to mint tokens so basically users can call the payable function. This in turn ...
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2answers
50 views

Test ICO problems

I have been learning to code smart contracts and I'm doing a test ICO witch I want to deploy to Rinkeby test net. And I have encountered a problem. Would some of you guys would mind to help me? I ...
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1answer
183 views

Call address.transfer() with Gas Limit and Price from another function

I have a smart contract where user can transfer ETH to an ICO. Like this function buyICO(paymentAddress, amount) { // do some other important things // transfer the amount to the payment address ...
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37 views

Gas requirement of function high on azure private ethereum network

I deployed a smart contract how manage an ICO on azure private ethereum network. Some of the functions in the contract have a high gas requirements and can not be executed. for example: function ...
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1answer
62 views

Why are ICO startups claiming to build blockchains with different functionality, but yet are using Ethereum?

I've been researching the top blockchain startups by market cap on https://etherscan.io/tokens. For example: EOS (EOS) Tronix (TRX) VeChain (VEN) etc. And I'm just not understanding what they ...
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2answers
69 views

Warnings ICO contracts : set a now time or a future date-time

Time issue in Solidity ICO contract. Should I set time in future, 17.05.2018.10.00? and not use 'now' as I read it will not work. Warning below. use of "now": "now" does not mean current time. Now is ...
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2answers
148 views

How to store Remix Ethereum file?

I'm using remix ether to make a smart contract However, I have no idea how to store information about contract. If I turn off a computer or want to connect with other things, do i have to rewrite ...
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0answers
50 views

How can I create a crowdsale for tokens already held in my wallet?

For example, I had an initial crowdsale with a specific end date. The end date passed and then the unsold tokens were forwarded to my wallet address. How can a new crowdsale contract be created for ...
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1answer
27 views

Important Question: ICO, How are the “Roadmaps” of “Contracts”

I would really like to know this if there's someone willing to support this quite easy, but great to know, before doing anything wrong about the road to ICO. Question: How's the road to do on the ...
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38 views

re-entrancy vulnerability

I have this code : function finish(address _teamFund, address _ecosystemFund, address _bountyFund) public onlyOwner { require(!isFinalized); uint256 alreadyMinted = token.totalSupply(); ...
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1answer
31 views

Set a number in Remix payable source

There's buyprice on function buy and sellprice on function sell. I would like to set up 1 ETH = 10000(SYMBOL) 0.1 ETH = 1000 (SYMBOL) 0.01 ETH = 100 (SYMBOL) 0.001 ETH = 10 (SYMBOL) HOW can I set a ...
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1answer
30 views

Please Help me where to put payable and fallback in my source

This problem shows with a message I know there's problem with source There's no payable, fallback source in it. Please tell me about payable & fallback source and where to put it. Or This ...
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95 views

I have a MainNet deployed ERC20 Token contract and a deployed crowdsale contract for it. Can I keep the former for future ICOs?

The title says it pretty much... I have this contracts (based on the Token Market contracts): Token: https://etherscan.io/address/0xb09345CE9A795EfE675197838E5aCde392B71317#code Crowdsale: https://...