Kovan is a Proof of Authority (PoA) publicly accessible blockchain for Ethereum; created and maintained by a consortium of Ethereum developers, to aide the Ethereum developer community.

Consistent

4-second

blocktimes

is an ERC20 token contract on one ethereum-based blockchain that is backed by ether on another ethereum-based blockchain - a side-chain.

connect your DApp sidechain with other chains

alices

side ⛓

bobs

side ⛓

charleys

side ⛓

dianas

side ⛓

n^n

Oh noes, DOES NOT SCALE :( !

... a heterogeneous multi‑chain technology.

... a protocol that allows independent blockchains to exchange information.

... an interoperability layer, that enforces order and the validity of the messages between the chains

Parachains are separate chains run in and with direct knowledge of polkadot.

& bridges allow interactions with 3rd Party chains.

relay chain

⛓

alices

para ⛓

bobs

para ⛓

charleys

para ⛓

dianas

para ⛓

1 - n

YAY!

INTEROPERABILITY!

... is a Polkadot compatible, general purpose blockchain development SDK

... grew out of Polkadot development framework

... is written in type-safe rust and WebAssembly ("WASM")

Rhododendron (PBFT, instant finality); Aurand (probabilistic finality, constant blocktime); GRANDPA (progressive, adaptive finality); Ouroboros (live, probabilistic finality) (planned); PoW (e.g., Ethash) (planned); Parachain (PoV, Polkadot consensus) (planned) or roll your own

Base-16 modified Merkle trie (aka Etherium); Binary Merkle trie (a la Shasper) (planned); Dynamic create, modify, delete so you can roll your own

.. is a web standard for an assembly like compile-target to run code in Web Browsers as almost native speed

.. is execute in a sandboxed virtual environment

.. can be compiled to from many system languages (C, C++, rust, ...)

Substrate

Wasm Chain

execute_block

Polkadot is an interoperability protocol with multi-chain collaboration at the core of its design

thanks!