Utility Contracts

The single DAO built by a private copy of The DAO's factory, with parameters no one could meet.

A three party escrow whose seller and arbiter are written into the code, with the deploying account taken as the buyer.

The Congress contract from the ethereum.org tutorial: an owner appoints members with voting weight, and proposals pass on a margin the owner sets.

The ethereum.org democracy tutorial: token holders propose a transaction, vote on it for a fixed period, and the contract sends it if it passes.

A liveness canary for the Ethereum Alarm Clock, deployed 1 July 2016.

The ethereum.org crowdsale tutorial: contributions run to a deadline against a goal, pay out a separate reward token, and are refunded if the goal is missed.

A one function voting contract that records votes as events, deployed by Alex Van de Sande on 4 July 2016.

The DAO's ManagedAccount: it counts every wei it receives, and only its owner may pay out, optionally to nobody but the owner.

The ethereum.org democracy tutorial: token holders propose a transaction, vote on it for a fixed period, and the contract sends it if it passes.

The ethereum.org crowdsale tutorial: contributions run to a deadline against a goal, pay out a separate reward token, and are refunded if the goal is missed.

Earliest ShapeShift on-chain contract (Jul 24, 2016). Simple ETH forwarder with an active flag — routes deposits to target when active and msg.value > 0.

DAO whitehat balance-conditional router: if EF/whitehat address holds >1M ETH, route to addr1; otherwise route to addr2.

ShapeShift ETH/ETC routing contract (Jul 26, 2016). Forwards ETH to target only when on-chain forked() oracle result matches stored boolean — routing deposits to the correct wallet on each chain post-DAO-fork.

ShapeShift ETH/ETC routing contract (Jul 26, 2016). Twin instance of the ShapeShiftReceiver — identical bytecode, configured for the opposite chain fork state.

A liveness canary for the Ethereum Alarm Clock, deployed 28 July 2016.

Truffle's Migrations bookkeeping contract: it records the number of the last completed migration so a rerun knows where to resume.

The ethereum.org democracy tutorial: token holders propose a transaction, vote on it for a fixed period, and the contract sends it if it passes.

A poll contract holding options, voters and a resolution rule

The go-ethereum Contract Tutorial greeter, deployed with the greeting: Hello from Blokur!

The go-ethereum Contract Tutorial greeter, deployed with the greeting: test

The transfer and allowance logic of the Devcon 2 attendee token, kept in a library

The go-ethereum Contract Tutorial greeter, deployed with the greeting: hello

The ethereum.org crowdsale tutorial: contributions run to a deadline against a goal, pay out a separate reward token, and are refunded if the goal is missed.

A TokenTrader quoting Augur's REP against ether at a fixed spread, in lots of 100,000 token units.