# ink! Smart Contracts

## What is ink!?

It's Solidity, but without the chains. Users can build smart contracts to deploy onto your blockchain, but they are also able to be deployed to other networks. 

Let's start with a review of the pre-built [examples](https://github.com/paritytech/ink/tree/master/examples) available by Parity. We'll offer some ideas of how to implement these into the Build3 blockchain to help provide context.

## Ready-to-Ship Examples

### [Delegator](https://github.com/paritytech/ink/tree/master/examples/delegator)

The delegator smart contract is the showcase for executing other smart contracts on-chain. 

It includes in total 4 different smart contracts

* Delegator (root): Delegates calls either to the Adder or Subber smart contract
* Adder: Increases a value in the Accumulator smart contract
* Subber: Decreases a value in the Accumulator smart contract
* Accumulator: Owns a simple `i32` value that can be incremented or decremented

#### Ideas

* An architect can be delegated the authority to submit product data for review on behalf of a trade contractor.

### [DNS Registration](https://github.com/paritytech/ink/tree/master/examples/dns)

Replace complicated, hard to remember addresses with simple domain names like `kenny.build3`

{% hint style="info" %}
`Note that all values are stored as hex and so a string must be converted to hex prior to registration.`

`The front end allows the user input`` `**`kenny.b3`**` ``but the storage is set at` 0x6b656e6e792e6233000000000000000 and assigned to the origin of the requester. 
{% endhint %}

### [Multisignature Authorization](https://github.com/paritytech/ink/tree/master/examples/multisig)

One origin with multiple signatories. The number of those parties signing can be configured and changed for each contract.  This can represent many things such as

* submittal approvals (trade contractor, general contractor, engineer, architect)
* general authorizations of work (hiring and working parties)
* certificates of occupancy (inspector, plan reviewer, engineer of record)