From git to blockchain ! This talk is about git, immutability, bitcoin, blockchain and links between the two. Is git a blockchain ? Is bitcoin a git repository ? Find more inside...

1. Degità
lablockchain
Snowcamp 2017 - @sabativi

2. VictorSabatier
Freelance Web and mobile
developper.
Build stuff using Meteor, React
and React native.
Love learning and sharing
victor@reactivic.com
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3. Plan:
1. Deeper look into git
2. How Blockchain works ?
3. Links between the two
4. Bonus and conclusion
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4. Adeeperlookintogit.
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5. Someadvantages:
· Local operations.
· Integrity.
· Everyone has a copy of the
entire repo.
· Few operations are
destructive.
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6. Gitispurelyfunctional
datastructure.
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7. Afunctionaldatastructureis
animmutabledatastructure.
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11. Commiting
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15. Amending
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17. Branching
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21. Rebasing
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23. Blockchain
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24. Blockchain
Bitcoin
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25. HowisBitcoinworking?
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26. WhyBitcoin?
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27. Oninternet,alltrades
aredonewithfinancial
institutions
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28. Wehavetotrustthem.
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29. Exchangemoneywithout
theneedofacentral
trustedparty
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30. Howitworks?
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31. Decentralizedledger.
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32. Howtoreachaconcensus
onapeertopeerNetwork?
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33. Problemstosolve
· Identification ?
· Enough money ?
· How to avoid double
spending ?
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34. Everytransactionis
signedwithaprivatekey.
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35. Transactionshave
inputsthatreference
previousoutputs
transactions.
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36. Transactionchain
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37. Howtoavoiddouble
spending?
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43. Orderproblem
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44. Howtoagreeonanorder?
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45. Wecannotdependon
timeasitiseasily
falsifiable.
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46. Blockchain.
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47. Block
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48. AnswertoaMathematical
problem
Hard to solve, easy to verify.
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49. 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.
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50. Miners
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51. Firstpersontofindasolution
willbroadcasttheblocktothe
network
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55. Severalpossiblebranches
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57. Youalwaysswitchedtothe
longuestbranch.
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59. WehavereplaceTrustin
FinancebytrustinMath.
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60. Halfofnodesmustbehonnest.
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61. Linksbetweenblockchain
andgit
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62. Isgitablockchain?
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63. · 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.
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64. · 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.
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65. InGitcontentmatters
regardless of the branch,
inBlockchainconsensusmatters
regardless of the content.
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66. IsBitcoinagit
repository?
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67. FromBitcointoGitcoinOr how to turn a git repository into a blockchain
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68. Demo
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69. Conclusions
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70. Thanksfolks
Q&A
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71. Ihaveconstructedthispresentationwith3
:
· Bitcoin under the hood
· Mastering Bitcoin
· Original paper
· Coursera
· Git is a purely functional data structure
· Stripe challenge
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Icons made by Freepik from [Flaticon]
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