Decentralised Applications
DAPP
Icons by TheNounProject
Photo by Tyler Lastovich on Unsplash
Laurent Hardy
What is the
Killer App?
Network effect
Internet Stack
Blockchain Stack
Protocol layer
Application layer
Application layer
Protocol layer
Fat Protocol
Application layer
Protocol
Thin Protocol
Protocol
Protocol
Blockchain Stack
i.e Linux
source: Fat protocols, Thin protocols
Traditional Economy
Token Economy
source: Thin protocols
building blocks
functionalities
experiments
scams
blockchains
source: crypt0snews retweet
How does a DAPP come into existence?
- Take the sourceCode of the smart contract
- Compile the source code into a JSON file
- Extract the contract ABI (Application Binary Interface)
- Extract the byte code
- Instantiate a new contract object
- Deploy the smart contract to the Ethereum blockchain
Deploy a smart contract
Every node on the Ethereum blockchain network has a copy of the smart contract
But the rest
of the world
has no clue!
How to interact with a DAPP?
State variables
they are defined once and cannot change, they are set in stone
Functions
they are used to check the value of a variable, they cost zero gas, they are free
Modifiers
they are used to modify the value of a variable, therefore they consume gas
source: Ethereum, Gas, Fuel & Fees
As of today, smart contract cannot be upgraded once deployed
Solidity documentation
in English here
documentación de Solidity
en Español aquí
Feedback is welcome.
Thanks.
