Where can I find some Solidity / Smart Contract source code examples? [closed]

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Closed 7 years ago.

Is there an easy to access list of Solidity / Smart Contracts / Dapps source code examples?

Related information:

List questions are generally off-topic and here is some more. — q9f, May 13, 2016 at 7:52
This list question seemed good enough to convert to a community wiki. — eth, Jun 18, 2016 at 1:37

36 revs, 2 users 97% · Accepted Answer · 2017-04-13 13:01:02Z

Please Edit Me to help keep this an up-to-date easily accessible resource. This is a community wiki post.

Documentation & Introduction

Solidity Documentation

Website: http://solidity.readthedocs.org/en/latest/

Solidity Baby Steps

From euri10 below.

Code: https://github.com/fivedogit/solidity-baby-steps

DAOs

The DAO

Code: https://github.com/slockit/DAO
Website: https://daohub.org/index.html

BTC Relay

Code: https://github.com/ethereum/btcrelay
Website: http://btcrelay.org/

Ethereum Wallet (Mist) Multisig Contract

From How to verify Mist's standard multisig wallet using Etherscan tool? and Documentation On Multisig Wallet in Mist?.

Code: https://github.com/ethereum/dapp-bin/blob/master/wallet/wallet.sol

Proof Of Existence

NoterEth

NoterEth, pronounced "Notaryth", is a prototype notary and "Proof of Existence" DAPP. By submitting hashes of documents you can proof on a later date that you were privileged to certain information at a point in history. The transfer of documents can enable other contracts to allow certain access based on who owns a hash.

Code: https://github.com/maran/notareth
Website: Download a copy of the code and run it from your computer.

Libraries & Utilities

Random Number Generators

Code: alexvandesande/Random generator
See also How can I securely generate a random number in my smart contract?

Ethereum Date And Time Tools

Working prototype.

Code: https://github.com/pipermerriam/ethereum-datetime

StringUtils #1

From decypha in the reddit/r/ethereum post.

Basic string utilities for Solidity, optimized for low gas usage.

Code: https://github.com/Arachnid/solidity-stringutils

StringUtils #2

By @pipermerriam from How can I modify bytes32 result to uint? by @euri10.

Code: https://github.com/pipermerriam/ethereum-string-utils

Ethereum Alarm Clock

Schedule calls to Ethereum contracts.

Code: http://www.ethereum-alarm-clock.com/source/v0.7.0/
Website: http://www.ethereum-alarm-clock.com/

Tokens & Currencies

The Good Old Greeter

Website: https://www.ethereum.org/greeter
Step by step guide to deploying and running Greeter: Deploying the Greeter contract via the geth CLI is not registering in my private blockchain .

Token

Create your own crypto-currency.

Code: https://www.ethereum.org/token

The Great Unicorn Meat Grinder

Grind up your Unicorn Tokens into ~~dogfood~~ meat.

Community Currency

A work-in-progress.

Code: https://github.com/segovro/Community-Currency

Exchange

Etheropt

A decentralised options exchange.

Code: https://github.com/etheropt/etheropt.github.io
Website: http://etheropt.github.io/

EtherEx

A decentralised exchange - alpha.

Code: https://github.com/etherex/etherex
Website: https://etherex.org/

Customizable Atomic Swap Contract

Posted by reddit user David_Moskowitz on Customizable Atomic Swap Contract (DGD for Ether).

Gambling

Ether Dice

A place where you can throw away your ethers.

Code: https://etherdice.io/#contract
Website: https://etherdice.io/ (unavailable at the moment)

Ethereum Dice (or Simple Dice Game)

Another place where you can throw away your ethers.

Code: https://etherscan.io/address/0x78b058ccda93816487c655367dcb79664a216ad2#code
Announced at https://bitcointalk.org/index.php?topic=1428982.0 . No website. Just send your ethers to the contract address.

Sleth - Ethereum Slot Machine

Working prototype.

Code: https://github.com/jorisbontje/sleth

EtherPot

You can't smoke this. It's a provably fair Lottery.

Code: http://etherpot.github.io/
Website: http://etherpot.github.io/

Pyramid Schemes

GovernMental

As posted by reddit user ethererik on GovernMental's 1100 ETH jackpot payout is stuck because it uses too much gas , the payout for this pyramid scheme may be stuck because the payout code requires the array of past creditors and amounts to be cleared, and this operation costs too much gas. The code to clear internal storage is:

creditorAddresses = new address[](0);
creditorAmounts = new uint[](0);

Apparently 1100 ethers are stuck in limbo.

WARNING - This is a situation Smart Contract developers need to be aware of!

The question How to clear large arrays without blowing the gas limit? has one answer to work around this issue. Thanks @Nick Johnson.

Ethereum Pyramid

A Pyramid scheme.

Code: https://ethereumpyramid.com/contract.html
Website: https://ethereumpyramid.com/

King Of The Ether Throne

Become a King or Queen, get rich and immortalise your name.

Code: https://github.com/kieranelby/KingOfTheEtherThrone/blob/v0.4.0/contracts/KingOfTheEtherThrone.sol
Website: http://www.kingoftheether.com/ . The author detected a problem with this code and a draft post-mortem investigation can be found at http://www.kingoftheether.com/postmortem.html .

The Greed Pit

Ethereum Doubler

Double your ether. Ponzi.

Protect The Castle

Another Ponzi game.

Messages

Etherboard

An image powered by the blockchain.

Code: http://etherboard.io/contract
Website: http://etherboard.io/

Ethereum Wall

A decentralised and open public message board.

Code: http://ethereumwall.com/tech.html
Website: http://ethereumwall.com/

Decentralised Twitter

Working prototype.

Code: https://github.com/yep/eth-tweet
Website: http://ethertweet.net/

Not Categorised Yet

Meteor Dapp Wallet

Multi-sig, daily-limited account proxy/wallet - "The Ξthereum wallet. NOTE The wallet is not yet official released, can contain severe bugs!"

Code: https://github.com/ethereum/meteor-dapp-wallet

Maker

Maker is a Decentralized Autonomous Organization that creates and insures the dai stablecoin on the Ethereum blockchain.

There are several public dapps and libraries in the Maker ecosystem:

Higher level information about Maker can be found here:

Code: https://github.com/MakerDAO
Website: https://makerdao.com/

EtherId

Register a domain name for your Ethereum account.

Code: https://github.com/lexansoft/EtherID.org
Website: http://etherid.org/

Public Votes

A publicly verifiable Voting System - working prototype.

Code: https://github.com/domschiener/publicvotes
Website: http://publicvotes.org/

State of the Dapps

You will have to trawl around to find the good ones - http://dapps.ethercasts.com/ .

SafeMarket

From aakilfernandes in the reddit/r/ethdev post - "Check out dapps.ethercast.com and look in repos, then search for .sol or .se files. Got a couple dozen here if you'd like to take a look."

https://github.com/SafeMarket/dapp/tree/master/app/contracts

Oraclize

From bertani in the reddit/r/ethdev post - "Here you can find some Oraclize-based ones ;)".

ether.camp

From inasacu in the reddit/r/ethdev post - "Try ether.camp".

Web page with Smart Contract source code: https://live.ether.camp/contracts

This will be a hell to maintain. Why don't you create a list of actual smart contracts including source code? — q9f, Apr 16, 2016 at 16:22
I was hoping that by being a community wiki post, this will get updated by the community. — BokkyPooBah, Apr 16, 2016 at 16:23

eth · Accepted Answer · 2016-04-13 09:07:23Z

7

votes

https://github.com/ethereum/dapp-bin has some Solidity code such as wallet, scrypt, and library. This is where Christian Reitwiessner (Solidity author), Gavin Wood, and Vitalik Buterin, have placed some of their DApps. Overall worth exploring, though some may not have a UI, or maybe written in Serpent.

answered Apr 13, 2016 at 9:07

community wiki

eth

Add a comment |

Juan Blanco · Accepted Answer · 2016-04-13 08:34:02Z

6

votes

DappSys

dappsys is contract system framework. It is a collection of Solidity contracts (classes) to help manage multi-contract dapps on ethereum.

Audit

On February 24th, 2016, Piper Merriam completed and signed a code audit covering the state of Dappsys as of commit 4dceee5.

Installation

npm install dapple dapple install https://github.com/nexusdev/dappsys

Github

https://github.com/nexusdev/dappsys

answered Apr 13, 2016 at 8:34

community wiki

Juan Blanco

Lazy question, are these contracts on the main network already for reuse?
– Gerbrand
Apr 14, 2016 at 20:32
They are, you can find the addresses (for morden testnet and main network) in the dappfile at github.com/nexusdev/dappsys/blob/master/dappfile
– stevenh512
Apr 15, 2016 at 5:05

Add a comment |

euri10 · Accepted Answer · 2016-04-14 06:38:46Z

5

votes

I loved those baby steps when I got interested in Solidity. Some practical simple stuff.

answered Apr 14, 2016 at 6:38

community wiki

euri10

Add a comment |

Roman Mandeleil · Accepted Answer · 2016-04-26 17:11:12Z

3

votes

Here you can check the full list of smart contracts people publishing today on the live network.

Most of them are really interesting study cases.

https://live.ether.camp/contracts

answered Apr 26, 2016 at 17:11

community wiki

Roman Mandeleil

Add a comment |

Where can I find some Solidity / Smart Contract source code examples? [closed]

5 Answers 5

Documentation & Introduction

Solidity Documentation

Solidity Baby Steps

DAOs

The DAO

BTC Relay

BTC Relay

Ethereum Wallet (Mist) Multisig Contract

Ethereum Wallet (Mist) Multisig Contract

Proof Of Existence

NoterEth

Libraries & Utilities

Random Number Generators

Ethereum Date And Time Tools

StringUtils #1

StringUtils #2

Ethereum Alarm Clock

Tokens & Currencies

The Good Old Greeter

Token

The Great Unicorn Meat Grinder

Community Currency

Exchange

Etheropt

EtherEx

Customizable Atomic Swap Contract

Gambling

Ether Dice

Ethereum Dice (or Simple Dice Game)

Sleth - Ethereum Slot Machine

EtherPot

Pyramid Schemes

GovernMental

Ethereum Pyramid

King Of The Ether Throne

The Greed Pit

Ethereum Doubler

Protect The Castle

Messages

Etherboard

Ethereum Wall

Decentralised Twitter

Not Categorised Yet

Meteor Dapp Wallet

Maker

EtherId

Public Votes

State of the Dapps

SafeMarket

Oraclize

ether.camp

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