De git à la blockchain

Degità
lablockchain
Snowcamp 2017 - @sabativi

VictorSabatier
Freelance Web and mobile
developper.
Build stuﬀ using Meteor, React
and React native.
Love learning and sharing
victor@reactivic.com

Plan:
1. Deeper look into git
2. How Blockchain works ?
3. Links between the two
4. Bonus and conclusion

Adeeperlookintogit.

Someadvantages:
· Local operations.
· Integrity.
· Everyone has a copy of the
entire repo.
· Few operations are
destructive.

Gitispurelyfunctional
datastructure.

Afunctionaldatastructureis
animmutabledatastructure.

Commiting

Amending

Branching

Rebasing

Blockchain

Blockchain
Bitcoin

HowisBitcoinworking?

WhyBitcoin?

Oninternet,alltrades
aredonewithfinancial
institutions

Wehavetotrustthem.

Exchangemoneywithout
theneedofacentral
trustedparty

Howitworks?

Decentralizedledger.

Howtoreachaconcensus
onapeertopeerNetwork?

Problemstosolve
· Identification ?
· Enough money ?
· How to avoid double
spending ?

Everytransactionis
signedwithaprivatekey.

Transactionshave
inputsthatreference
previousoutputs
transactions.

Transactionchain

Howtoavoiddouble
spending?

Orderproblem

Howtoagreeonanorder?

Wecannotdependon
timeasitiseasily
falsifiable.

Blockchain.

Block

AnswertoaMathematical
problem
Hard to solve, easy to verify.

SHA256(block,nonce)<yProof of work 2
2
Due to SHA256 construction, random guess or brute force is your best choice to find a solution.

Miners

Firstpersontofindasolution
willbroadcasttheblocktothe
network

Severalpossiblebranches

Youalwaysswitchedtothe
longuestbranch.

WehavereplaceTrustin
FinancebytrustinMath.

Halfofnodesmustbehonnest.

Linksbetweenblockchain
andgit

Isgitablockchain?

· Changes are organized in a
chain protected by
cryptographic hashes.
· Distributed storage and
integrity checks.
· Identification is secure.
· Blocks and commits used
Merkle trees internally.

· Everyone strives to work on a
single branch.
· No merge, no fork in
blockchain.
· No proof of work in git.
· Limited content on a block.

InGitcontentmatters
regardless of the branch,
inBlockchainconsensusmatters
regardless of the content.

IsBitcoinagit
repository?

FromBitcointoGitcoinOr how to turn a git repository into a blockchain

Demo

Conclusions

Thanksfolks
Q&A

Ihaveconstructedthispresentationwith3
:
· Bitcoin under the hood
· Mastering Bitcoin
· Original paper
· Coursera
· Git is a purely functional data structure
· Stripe challenge
3
Icons made by Freepik from [Flaticon]

De git à la blockchain

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