An introduction to Blockchain presented to the 4th Edition of Upper Egypt in Action Conference (UEA2018)

1. Blockchain Comes of Age
Mohannad El-Megharbel
Sr. Manager, Standardization & Technical Aspects
EGYPT
National Telecom Regulatory Authority
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2. Filling in the Gap
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1400s
1700s
1900s
2000s
Knowledge Gap Power Gap Distance Gap Next Gap?

3. Trust Gap
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4. Secure
Shared
Distributed
Ledger
Blockchain
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5. Blockchain cont.
Traditional System
Centralized system
with stored ledger
Blockchain System
Distributed system
with distributed ledger
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6. Bakr Noha Payment $500
Transaction (Tx)
From: Bakr (0xf5e…)
To: Noha (0x992…)
Amount: 500
Digital signature
0x23e423s3234…
2. Transaction is confirmed
though mining.
3. Confirmed transaction
gets pushed to network
1. Transaction information goes
through hash functions (to secure
it as well as create a time stamp)
Tx
Signature
Tx
Signature
Tx
Signature
Tx
SignatureTx
Signature
Tx
Signature
Tx
Signature
How does it work?
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7. Hash Functions
One output for every input
Variable input size turned to fixed output size
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Aswan  1+19+23+1+14 = 58
Aswan 93A742EF7E5A852855967FFE74CBD83B1E2BD5294633F89816DB2557798BA434
aswan D066CFCDA898BC44A4B884400D521BAB2C82841CC8D33479510F0EAC4DD5D525
Aswan IEEE 02FCCB113478B5DE71645FF28F3A242F7E5B7EE85A310DFD705D3C1E1F6CDA36

8. Block Header
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