SlideShare a Scribd company logo

Blockchain introduction

•
•
Thao Huynh Quang
Thao Huynh Quang

This is the short presentation of how does the theorem works at a high level. This presentation introduces Metamask, Infura, Etherscan, ... and how those systems interact with smart contracts.

Software
1 of 9
Download to read offline
Login to Metamask Send transaction (buy creeptoma) Call infura service (currently free) Select one node
 +
 execute transaction/query Choose one node
 execute transaction/query Send query directly to infura (without login. i.e: get creeptoma price) Send directly to one node MainNet Blockchain TestNet Blockchain
contract Creeptoma { function int getCreeptomaPrice(){} } Deploy - directly to one node - through infura 0x3cd9498845833058e48fde… Creetoma.getCreeptomaPrice() Call method of smart contract Local Blockchain TestNet Blockchain (8GB) MainNet Blockchain (>1TB)
20,000 gas 3$/ 1gas 1$/ 1gas 3$/ 1gas : gas price 20,000: gas used // Estimate: // Gas price: 1 gas = 10 Gwei // 1 Ether = 650$ // return a string export function estimateGasToUSD(gas) { return gweiToEther(gas * 10 * 750) + '$'; }
verify manual
On Chain vs Off Chain Solution
Blockchain introduction

Recommended

A698111855 22750 26_2018_finite
A698111855 22750 26_2018_finiteA698111855 22750 26_2018_finite
A698111855 22750 26_2018_finiteMohd Arif Ansari
 
Всеволод Поляков (DevOps Team Lead в Grammarly)
Всеволод Поляков (DevOps Team Lead в Grammarly)Всеволод Поляков (DevOps Team Lead в Grammarly)
Всеволод Поляков (DevOps Team Lead в Grammarly)Provectus
 
Net flix kafka seattle meetup
Net flix kafka seattle meetupNet flix kafka seattle meetup
Net flix kafka seattle meetupNitin Kumar
 
Lab 01 03_16
Lab 01 03_16Lab 01 03_16
Lab 01 03_16Hao Wu
 
Richard Salter: Using the Titanium OpenGL Module
Richard Salter: Using the Titanium OpenGL ModuleRichard Salter: Using the Titanium OpenGL Module
Richard Salter: Using the Titanium OpenGL ModuleAxway Appcelerator
 
CS5229 Lecture 3: Congestion Avoidance and Control
CS5229 Lecture 3: Congestion Avoidance and ControlCS5229 Lecture 3: Congestion Avoidance and Control
CS5229 Lecture 3: Congestion Avoidance and ControlWei Tsang Ooi
 
SqliteToRealm
SqliteToRealmSqliteToRealm
SqliteToRealmPluu love
 
Slide smallfiles
Slide smallfilesSlide smallfiles
Slide smallfilesrledisez
 

Recommended

A698111855 22750 26_2018_finite
A698111855 22750 26_2018_finiteA698111855 22750 26_2018_finite
A698111855 22750 26_2018_finiteMohd Arif Ansari
 
Всеволод Поляков (DevOps Team Lead в Grammarly)
Всеволод Поляков (DevOps Team Lead в Grammarly)Всеволод Поляков (DevOps Team Lead в Grammarly)
Всеволод Поляков (DevOps Team Lead в Grammarly)Provectus
 
Net flix kafka seattle meetup
Net flix kafka seattle meetupNet flix kafka seattle meetup
Net flix kafka seattle meetupNitin Kumar
 
Lab 01 03_16
Lab 01 03_16Lab 01 03_16
Lab 01 03_16Hao Wu
 
Richard Salter: Using the Titanium OpenGL Module
Richard Salter: Using the Titanium OpenGL ModuleRichard Salter: Using the Titanium OpenGL Module
Richard Salter: Using the Titanium OpenGL ModuleAxway Appcelerator
 
CS5229 Lecture 3: Congestion Avoidance and Control
CS5229 Lecture 3: Congestion Avoidance and ControlCS5229 Lecture 3: Congestion Avoidance and Control
CS5229 Lecture 3: Congestion Avoidance and ControlWei Tsang Ooi
 
SqliteToRealm
SqliteToRealmSqliteToRealm
SqliteToRealmPluu love
 
Slide smallfiles
Slide smallfilesSlide smallfiles
Slide smallfilesrledisez
 
C* Summit 2013: Time-Series Metrics with Cassandra by Mike Heffner
C* Summit 2013: Time-Series Metrics with Cassandra by Mike HeffnerC* Summit 2013: Time-Series Metrics with Cassandra by Mike Heffner
C* Summit 2013: Time-Series Metrics with Cassandra by Mike HeffnerDataStax Academy
 
Webrtc
WebrtcWebrtc
WebrtcBENNY VAZHAPPILLY
 
Message reliability in kafka
Message reliability in kafkaMessage reliability in kafka
Message reliability in kafkaMihai Ghita
 
Scaling metrics
Scaling metricsScaling metrics
Scaling metricsVladimir Varfolomeev
 
Understanding the Disruptor
Understanding the DisruptorUnderstanding the Disruptor
Understanding the DisruptorTrisha Gee
 
"Metrics: Where and How", Vsevolod Polyakov
"Metrics: Where and How", Vsevolod Polyakov"Metrics: Where and How", Vsevolod Polyakov
"Metrics: Where and How", Vsevolod PolyakovYulia Shcherbachova
 
Datafying Bitcoins
Datafying BitcoinsDatafying Bitcoins
Datafying BitcoinsTariq Ahmad
 
Message reliability in Kafka
Message reliability in KafkaMessage reliability in Kafka
Message reliability in KafkaMihai Ghita
 
A universal matter-wave interferometer with optical gratings in the time domain
A universal matter-wave interferometer with optical gratings in the time domainA universal matter-wave interferometer with optical gratings in the time domain
A universal matter-wave interferometer with optical gratings in the time domainPhysikUndMusik
 
Mirage: ML kernels in the cloud (ML Workshop 2010)
Mirage: ML kernels in the cloud (ML Workshop 2010)Mirage: ML kernels in the cloud (ML Workshop 2010)
Mirage: ML kernels in the cloud (ML Workshop 2010)Anil Madhavapeddy
 
Highlights of Go 1.1
Highlights of Go 1.1Highlights of Go 1.1
Highlights of Go 1.1jgrahamc
 
bup backup system (2011-04)
bup backup system (2011-04)bup backup system (2011-04)
bup backup system (2011-04)apenwarr
 
5th heat transfer class, tuesday, january 28, 2014
5th heat transfer class, tuesday, january 28, 20145th heat transfer class, tuesday, january 28, 2014
5th heat transfer class, tuesday, january 28, 2014Raymond Adamic
 
Garbage Collection of Java VM
Garbage Collection of Java VMGarbage Collection of Java VM
Garbage Collection of Java VMYongqiang Li
 
LOFAR - finding transients in the radio spectrum
LOFAR - finding transients in the radio spectrumLOFAR - finding transients in the radio spectrum
LOFAR - finding transients in the radio spectrumGijs Molenaar
 
Ndb cluster 80_tpc_h
Ndb cluster 80_tpc_hNdb cluster 80_tpc_h
Ndb cluster 80_tpc_hmikaelronstrom
 
Advanced smart contract
Advanced smart contractAdvanced smart contract
Advanced smart contractĐoàn Thái Thiên Lộc
 
Fluence: A Decentralized Data Processing Engine
Fluence: A Decentralized Data Processing EngineFluence: A Decentralized Data Processing Engine
Fluence: A Decentralized Data Processing EngineAlexander Demidko
 
Eclipsecon Europe: Blockchain, Ethereum and Business Applications
Eclipsecon Europe: Blockchain, Ethereum and Business ApplicationsEclipsecon Europe: Blockchain, Ethereum and Business Applications
Eclipsecon Europe: Blockchain, Ethereum and Business ApplicationsMatthias Zimmermann
 
Ethereum Solidity Fundamentals
Ethereum Solidity FundamentalsEthereum Solidity Fundamentals
Ethereum Solidity FundamentalsEno Bassey
 
26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjj
26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjj26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjj
26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjjMAHESHV559910
 
Metrics with Ganglia
Metrics with GangliaMetrics with Ganglia
Metrics with GangliaGareth Rushgrove
 

More Related Content

What's hot

C* Summit 2013: Time-Series Metrics with Cassandra by Mike Heffner
C* Summit 2013: Time-Series Metrics with Cassandra by Mike HeffnerC* Summit 2013: Time-Series Metrics with Cassandra by Mike Heffner
C* Summit 2013: Time-Series Metrics with Cassandra by Mike HeffnerDataStax Academy
 
Message reliability in kafka
Message reliability in kafkaMessage reliability in kafka
Message reliability in kafkaMihai Ghita
 
Understanding the Disruptor
Understanding the DisruptorUnderstanding the Disruptor
Understanding the DisruptorTrisha Gee
 
"Metrics: Where and How", Vsevolod Polyakov
"Metrics: Where and How", Vsevolod Polyakov"Metrics: Where and How", Vsevolod Polyakov
"Metrics: Where and How", Vsevolod PolyakovYulia Shcherbachova
 
Datafying Bitcoins
Datafying BitcoinsDatafying Bitcoins
Datafying BitcoinsTariq Ahmad
 
Message reliability in Kafka
Message reliability in KafkaMessage reliability in Kafka
Message reliability in KafkaMihai Ghita
 
A universal matter-wave interferometer with optical gratings in the time domain
A universal matter-wave interferometer with optical gratings in the time domainA universal matter-wave interferometer with optical gratings in the time domain
A universal matter-wave interferometer with optical gratings in the time domainPhysikUndMusik
 
Mirage: ML kernels in the cloud (ML Workshop 2010)
Mirage: ML kernels in the cloud (ML Workshop 2010)Mirage: ML kernels in the cloud (ML Workshop 2010)
Mirage: ML kernels in the cloud (ML Workshop 2010)Anil Madhavapeddy
 
Highlights of Go 1.1
Highlights of Go 1.1Highlights of Go 1.1
Highlights of Go 1.1jgrahamc
 
bup backup system (2011-04)
bup backup system (2011-04)bup backup system (2011-04)
bup backup system (2011-04)apenwarr
 
5th heat transfer class, tuesday, january 28, 2014
5th heat transfer class, tuesday, january 28, 20145th heat transfer class, tuesday, january 28, 2014
5th heat transfer class, tuesday, january 28, 2014Raymond Adamic
 
Garbage Collection of Java VM
Garbage Collection of Java VMGarbage Collection of Java VM
Garbage Collection of Java VMYongqiang Li
 
LOFAR - finding transients in the radio spectrum
LOFAR - finding transients in the radio spectrumLOFAR - finding transients in the radio spectrum
LOFAR - finding transients in the radio spectrumGijs Molenaar
 

What's hot (16)

C* Summit 2013: Time-Series Metrics with Cassandra by Mike Heffner
C* Summit 2013: Time-Series Metrics with Cassandra by Mike HeffnerC* Summit 2013: Time-Series Metrics with Cassandra by Mike Heffner
C* Summit 2013: Time-Series Metrics with Cassandra by Mike Heffner
 
Webrtc
WebrtcWebrtc
Webrtc
 
Message reliability in kafka
Message reliability in kafkaMessage reliability in kafka
Message reliability in kafka
 
Scaling metrics
Scaling metricsScaling metrics
Scaling metrics
 
Understanding the Disruptor
Understanding the DisruptorUnderstanding the Disruptor
Understanding the Disruptor
 
"Metrics: Where and How", Vsevolod Polyakov
"Metrics: Where and How", Vsevolod Polyakov"Metrics: Where and How", Vsevolod Polyakov
"Metrics: Where and How", Vsevolod Polyakov
 
Datafying Bitcoins
Datafying BitcoinsDatafying Bitcoins
Datafying Bitcoins
 
Message reliability in Kafka
Message reliability in KafkaMessage reliability in Kafka
Message reliability in Kafka
 
A universal matter-wave interferometer with optical gratings in the time domain
A universal matter-wave interferometer with optical gratings in the time domainA universal matter-wave interferometer with optical gratings in the time domain
A universal matter-wave interferometer with optical gratings in the time domain
 
Mirage: ML kernels in the cloud (ML Workshop 2010)
Mirage: ML kernels in the cloud (ML Workshop 2010)Mirage: ML kernels in the cloud (ML Workshop 2010)
Mirage: ML kernels in the cloud (ML Workshop 2010)
 
Highlights of Go 1.1
Highlights of Go 1.1Highlights of Go 1.1
Highlights of Go 1.1
 
bup backup system (2011-04)
bup backup system (2011-04)bup backup system (2011-04)
bup backup system (2011-04)
 
5th heat transfer class, tuesday, january 28, 2014
5th heat transfer class, tuesday, january 28, 20145th heat transfer class, tuesday, january 28, 2014
5th heat transfer class, tuesday, january 28, 2014
 
Garbage Collection of Java VM
Garbage Collection of Java VMGarbage Collection of Java VM
Garbage Collection of Java VM
 
LOFAR - finding transients in the radio spectrum
LOFAR - finding transients in the radio spectrumLOFAR - finding transients in the radio spectrum
LOFAR - finding transients in the radio spectrum
 
Ndb cluster 80_tpc_h
Ndb cluster 80_tpc_hNdb cluster 80_tpc_h
Ndb cluster 80_tpc_h
 

Similar to Blockchain introduction

Fluence: A Decentralized Data Processing Engine
Fluence: A Decentralized Data Processing EngineFluence: A Decentralized Data Processing Engine
Fluence: A Decentralized Data Processing EngineAlexander Demidko
 
Eclipsecon Europe: Blockchain, Ethereum and Business Applications
Eclipsecon Europe: Blockchain, Ethereum and Business ApplicationsEclipsecon Europe: Blockchain, Ethereum and Business Applications
Eclipsecon Europe: Blockchain, Ethereum and Business ApplicationsMatthias Zimmermann
 
Ethereum Solidity Fundamentals
Ethereum Solidity FundamentalsEthereum Solidity Fundamentals
Ethereum Solidity FundamentalsEno Bassey
 
26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjj
26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjj26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjj
26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjjMAHESHV559910
 
Sun jdk 1.6 gc english version
Sun jdk 1.6 gc english versionSun jdk 1.6 gc english version
Sun jdk 1.6 gc english versionbluedavy lin
 
Blockchain, Ethereum and Business Applications
Blockchain, Ethereum and Business ApplicationsBlockchain, Ethereum and Business Applications
Blockchain, Ethereum and Business ApplicationsMatthias Zimmermann
 
“Create your own cryptocurrency in an hour” - Sandip Pandey
“Create your own cryptocurrency in an hour” - Sandip Pandey“Create your own cryptocurrency in an hour” - Sandip Pandey
“Create your own cryptocurrency in an hour” - Sandip PandeyEIT Digital Alumni
 

Similar to Blockchain introduction (10)

Advanced smart contract
Advanced smart contractAdvanced smart contract
Advanced smart contract
 
Fluence: A Decentralized Data Processing Engine
Fluence: A Decentralized Data Processing EngineFluence: A Decentralized Data Processing Engine
Fluence: A Decentralized Data Processing Engine
 
Eclipsecon Europe: Blockchain, Ethereum and Business Applications
Eclipsecon Europe: Blockchain, Ethereum and Business ApplicationsEclipsecon Europe: Blockchain, Ethereum and Business Applications
Eclipsecon Europe: Blockchain, Ethereum and Business Applications
 
Ethereum Solidity Fundamentals
Ethereum Solidity FundamentalsEthereum Solidity Fundamentals
Ethereum Solidity Fundamentals
 
26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjj
26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjj26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjj
26065613bjmmnnnnnnnnnnnjjjjjjjjjjjjjjjjjj
 
Metrics with Ganglia
Metrics with GangliaMetrics with Ganglia
Metrics with Ganglia
 
Sun jdk 1.6 gc english version
Sun jdk 1.6 gc english versionSun jdk 1.6 gc english version
Sun jdk 1.6 gc english version
 
Tribeflow on bitcoin data
Tribeflow on bitcoin dataTribeflow on bitcoin data
Tribeflow on bitcoin data
 
Blockchain, Ethereum and Business Applications
Blockchain, Ethereum and Business ApplicationsBlockchain, Ethereum and Business Applications
Blockchain, Ethereum and Business Applications
 
“Create your own cryptocurrency in an hour” - Sandip Pandey
“Create your own cryptocurrency in an hour” - Sandip Pandey“Create your own cryptocurrency in an hour” - Sandip Pandey
“Create your own cryptocurrency in an hour” - Sandip Pandey
 

More from Thao Huynh Quang

2021-03-08-telegram-vs-signal.pdf
2021-03-08-telegram-vs-signal.pdf2021-03-08-telegram-vs-signal.pdf
2021-03-08-telegram-vs-signal.pdfThao Huynh Quang
 
Consensus and Raft Algorithm in Distributed System
Consensus and Raft Algorithm in Distributed SystemConsensus and Raft Algorithm in Distributed System
Consensus and Raft Algorithm in Distributed SystemThao Huynh Quang
 
Consensus and Raft algorithm (Vietnamese version)
Consensus and Raft algorithm (Vietnamese version)Consensus and Raft algorithm (Vietnamese version)
Consensus and Raft algorithm (Vietnamese version)Thao Huynh Quang
 
Kotlin Introduction with Android applications
Kotlin Introduction with Android applicationsKotlin Introduction with Android applications
Kotlin Introduction with Android applicationsThao Huynh Quang
 
Git Introduction with illustrations
Git Introduction with illustrationsGit Introduction with illustrations
Git Introduction with illustrationsThao Huynh Quang
 
Android Jetpack: Room persistence library
Android Jetpack: Room persistence libraryAndroid Jetpack: Room persistence library
Android Jetpack: Room persistence libraryThao Huynh Quang
 
Kubernetes and service mesh application
Kubernetes and service mesh applicationKubernetes and service mesh application
Kubernetes and service mesh applicationThao Huynh Quang
 
Kafka: All an engineer needs to know
Kafka: All an engineer needs to knowKafka: All an engineer needs to know
Kafka: All an engineer needs to knowThao Huynh Quang
 
Concurrency pattern in Kotlin
Concurrency pattern in KotlinConcurrency pattern in Kotlin
Concurrency pattern in KotlinThao Huynh Quang
 
Observability and its application
Observability and its applicationObservability and its application
Observability and its applicationThao Huynh Quang
 
Android Reverse Engineering
Android Reverse EngineeringAndroid Reverse Engineering
Android Reverse EngineeringThao Huynh Quang
 

More from Thao Huynh Quang (16)

2021-03-08-telegram-vs-signal.pdf
2021-03-08-telegram-vs-signal.pdf2021-03-08-telegram-vs-signal.pdf
2021-03-08-telegram-vs-signal.pdf
 
Consensus and Raft Algorithm in Distributed System
Consensus and Raft Algorithm in Distributed SystemConsensus and Raft Algorithm in Distributed System
Consensus and Raft Algorithm in Distributed System
 
Consensus and Raft algorithm (Vietnamese version)
Consensus and Raft algorithm (Vietnamese version)Consensus and Raft algorithm (Vietnamese version)
Consensus and Raft algorithm (Vietnamese version)
 
Kotlin Introduction with Android applications
Kotlin Introduction with Android applicationsKotlin Introduction with Android applications
Kotlin Introduction with Android applications
 
Git Introduction with illustrations
Git Introduction with illustrationsGit Introduction with illustrations
Git Introduction with illustrations
 
Android Jetpack: Room persistence library
Android Jetpack: Room persistence libraryAndroid Jetpack: Room persistence library
Android Jetpack: Room persistence library
 
Android Performance Tips
Android Performance TipsAndroid Performance Tips
Android Performance Tips
 
Kubernetes and service mesh application
Kubernetes and service mesh applicationKubernetes and service mesh application
Kubernetes and service mesh application
 
Kafka: All an engineer needs to know
Kafka: All an engineer needs to knowKafka: All an engineer needs to know
Kafka: All an engineer needs to know
 
Concurrency pattern in Kotlin
Concurrency pattern in KotlinConcurrency pattern in Kotlin
Concurrency pattern in Kotlin
 
Observability and its application
Observability and its applicationObservability and its application
Observability and its application
 
GraphQL in Android
GraphQL in AndroidGraphQL in Android
GraphQL in Android
 
Android GRPC
Android GRPCAndroid GRPC
Android GRPC
 
Android Reverse Engineering
Android Reverse EngineeringAndroid Reverse Engineering
Android Reverse Engineering
 
nosql
nosqlnosql
nosql
 
android deep linking
android deep linkingandroid deep linking
android deep linking
 

Recently uploaded

React Server Component in Next.js by Hanief Utama
React Server Component in Next.js by Hanief UtamaReact Server Component in Next.js by Hanief Utama
React Server Component in Next.js by Hanief UtamaHanief Utama
 
SensoDat: Simulation-based Sensor Dataset of Self-driving Cars
SensoDat: Simulation-based Sensor Dataset of Self-driving CarsSensoDat: Simulation-based Sensor Dataset of Self-driving Cars
SensoDat: Simulation-based Sensor Dataset of Self-driving CarsChristian Birchler
 
Recruitment Management Software Benefits (Infographic)
Recruitment Management Software Benefits (Infographic)Recruitment Management Software Benefits (Infographic)
Recruitment Management Software Benefits (Infographic)Hr365.us smith
 
Software Coding for software engineering
Software Coding for software engineeringSoftware Coding for software engineering
Software Coding for software engineeringssuserb3a23b
 
Intelligent Home Wi-Fi Solutions | ThinkPalm
Intelligent Home Wi-Fi Solutions | ThinkPalmIntelligent Home Wi-Fi Solutions | ThinkPalm
Intelligent Home Wi-Fi Solutions | ThinkPalmSujith Sukumaran
 
Software Project Health Check: Best Practices and Techniques for Your Product...
Software Project Health Check: Best Practices and Techniques for Your Product...Software Project Health Check: Best Practices and Techniques for Your Product...
Software Project Health Check: Best Practices and Techniques for Your Product...Velvetech LLC
 
Catch the Wave: SAP Event-Driven and Data Streaming for the Intelligence Ente...
Catch the Wave: SAP Event-Driven and Data Streaming for the Intelligence Ente...Catch the Wave: SAP Event-Driven and Data Streaming for the Intelligence Ente...
Catch the Wave: SAP Event-Driven and Data Streaming for the Intelligence Ente...confluent
 
MYjobs Presentation Django-based project
MYjobs Presentation Django-based projectMYjobs Presentation Django-based project
MYjobs Presentation Django-based projectAnoyGreter
 
Unveiling the Future: Sylius 2.0 New Features
Unveiling the Future: Sylius 2.0 New FeaturesUnveiling the Future: Sylius 2.0 New Features
Unveiling the Future: Sylius 2.0 New FeaturesŁukasz Chruściel
 
cpct NetworkING BASICS AND NETWORK TOOL.ppt
cpct NetworkING BASICS AND NETWORK TOOL.pptcpct NetworkING BASICS AND NETWORK TOOL.ppt
cpct NetworkING BASICS AND NETWORK TOOL.pptrcbcrtm
 
Automate your Kamailio Test Calls - Kamailio World 2024
Automate your Kamailio Test Calls - Kamailio World 2024Automate your Kamailio Test Calls - Kamailio World 2024
Automate your Kamailio Test Calls - Kamailio World 2024Andreas Granig
 
Powering Real-Time Decisions with Continuous Data Streams
Powering Real-Time Decisions with Continuous Data StreamsPowering Real-Time Decisions with Continuous Data Streams
Powering Real-Time Decisions with Continuous Data StreamsSafe Software
 
Cloud Data Center Network Construction - IEEE
Cloud Data Center Network Construction - IEEECloud Data Center Network Construction - IEEE
Cloud Data Center Network Construction - IEEEVICTOR MAESTRE RAMIREZ
 
Ahmed Motair CV April 2024 (Senior SW Developer)
Ahmed Motair CV April 2024 (Senior SW Developer)Ahmed Motair CV April 2024 (Senior SW Developer)
Ahmed Motair CV April 2024 (Senior SW Developer)Ahmed Mater
 
Exploring Selenium_Appium Frameworks for Seamless Integration with HeadSpin.pdf
Exploring Selenium_Appium Frameworks for Seamless Integration with HeadSpin.pdfExploring Selenium_Appium Frameworks for Seamless Integration with HeadSpin.pdf
Exploring Selenium_Appium Frameworks for Seamless Integration with HeadSpin.pdfkalichargn70th171
 
Balasore Best It Company|| Top 10 IT Company || Balasore Software company Odisha
Balasore Best It Company|| Top 10 IT Company || Balasore Software company OdishaBalasore Best It Company|| Top 10 IT Company || Balasore Software company Odisha
Balasore Best It Company|| Top 10 IT Company || Balasore Software company Odishasmiwainfosol
 
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdf
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdfGOING AOT WITH GRAALVM – DEVOXX GREECE.pdf
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdfAlina Yurenko
 
What is Advanced Excel and what are some best practices for designing and cre...
What is Advanced Excel and what are some best practices for designing and cre...What is Advanced Excel and what are some best practices for designing and cre...
What is Advanced Excel and what are some best practices for designing and cre...Technogeeks
 
办理学位证(UQ文凭证书)昆士兰大学毕业证成绩单原版一模一样
办理学位证(UQ文凭证书)昆士兰大学毕业证成绩单原版一模一样办理学位证(UQ文凭证书)昆士兰大学毕业证成绩单原版一模一样
办理学位证(UQ文凭证书)昆士兰大学毕业证成绩单原版一模一样umasea
 

Recently uploaded (20)

React Server Component in Next.js by Hanief Utama
React Server Component in Next.js by Hanief UtamaReact Server Component in Next.js by Hanief Utama
React Server Component in Next.js by Hanief Utama
 
SensoDat: Simulation-based Sensor Dataset of Self-driving Cars
SensoDat: Simulation-based Sensor Dataset of Self-driving CarsSensoDat: Simulation-based Sensor Dataset of Self-driving Cars
SensoDat: Simulation-based Sensor Dataset of Self-driving Cars
 
Recruitment Management Software Benefits (Infographic)
Recruitment Management Software Benefits (Infographic)Recruitment Management Software Benefits (Infographic)
Recruitment Management Software Benefits (Infographic)
 
Software Coding for software engineering
Software Coding for software engineeringSoftware Coding for software engineering
Software Coding for software engineering
 
Intelligent Home Wi-Fi Solutions | ThinkPalm
Intelligent Home Wi-Fi Solutions | ThinkPalmIntelligent Home Wi-Fi Solutions | ThinkPalm
Intelligent Home Wi-Fi Solutions | ThinkPalm
 
Software Project Health Check: Best Practices and Techniques for Your Product...
Software Project Health Check: Best Practices and Techniques for Your Product...Software Project Health Check: Best Practices and Techniques for Your Product...
Software Project Health Check: Best Practices and Techniques for Your Product...
 
Catch the Wave: SAP Event-Driven and Data Streaming for the Intelligence Ente...
Catch the Wave: SAP Event-Driven and Data Streaming for the Intelligence Ente...Catch the Wave: SAP Event-Driven and Data Streaming for the Intelligence Ente...
Catch the Wave: SAP Event-Driven and Data Streaming for the Intelligence Ente...
 
MYjobs Presentation Django-based project
MYjobs Presentation Django-based projectMYjobs Presentation Django-based project
MYjobs Presentation Django-based project
 
Unveiling the Future: Sylius 2.0 New Features
Unveiling the Future: Sylius 2.0 New FeaturesUnveiling the Future: Sylius 2.0 New Features
Unveiling the Future: Sylius 2.0 New Features
 
cpct NetworkING BASICS AND NETWORK TOOL.ppt
cpct NetworkING BASICS AND NETWORK TOOL.pptcpct NetworkING BASICS AND NETWORK TOOL.ppt
cpct NetworkING BASICS AND NETWORK TOOL.ppt
 
Hot Sexy call girls in Patel Nagar🔝 9953056974 🔝 escort Service
Hot Sexy call girls in Patel Nagar🔝 9953056974 🔝 escort ServiceHot Sexy call girls in Patel Nagar🔝 9953056974 🔝 escort Service
Hot Sexy call girls in Patel Nagar🔝 9953056974 🔝 escort Service
 
Automate your Kamailio Test Calls - Kamailio World 2024
Automate your Kamailio Test Calls - Kamailio World 2024Automate your Kamailio Test Calls - Kamailio World 2024
Automate your Kamailio Test Calls - Kamailio World 2024
 
Powering Real-Time Decisions with Continuous Data Streams
Powering Real-Time Decisions with Continuous Data StreamsPowering Real-Time Decisions with Continuous Data Streams
Powering Real-Time Decisions with Continuous Data Streams
 
Cloud Data Center Network Construction - IEEE
Cloud Data Center Network Construction - IEEECloud Data Center Network Construction - IEEE
Cloud Data Center Network Construction - IEEE
 
Ahmed Motair CV April 2024 (Senior SW Developer)
Ahmed Motair CV April 2024 (Senior SW Developer)Ahmed Motair CV April 2024 (Senior SW Developer)
Ahmed Motair CV April 2024 (Senior SW Developer)
 
Exploring Selenium_Appium Frameworks for Seamless Integration with HeadSpin.pdf
Exploring Selenium_Appium Frameworks for Seamless Integration with HeadSpin.pdfExploring Selenium_Appium Frameworks for Seamless Integration with HeadSpin.pdf
Exploring Selenium_Appium Frameworks for Seamless Integration with HeadSpin.pdf
 
Balasore Best It Company|| Top 10 IT Company || Balasore Software company Odisha
Balasore Best It Company|| Top 10 IT Company || Balasore Software company OdishaBalasore Best It Company|| Top 10 IT Company || Balasore Software company Odisha
Balasore Best It Company|| Top 10 IT Company || Balasore Software company Odisha
 
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdf
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdfGOING AOT WITH GRAALVM – DEVOXX GREECE.pdf
GOING AOT WITH GRAALVM – DEVOXX GREECE.pdf
 
What is Advanced Excel and what are some best practices for designing and cre...
What is Advanced Excel and what are some best practices for designing and cre...What is Advanced Excel and what are some best practices for designing and cre...
What is Advanced Excel and what are some best practices for designing and cre...
 
办理学位证(UQ文凭证书)昆士兰大学毕业证成绩单原版一模一样
办理学位证(UQ文凭证书)昆士兰大学毕业证成绩单原版一模一样办理学位证(UQ文凭证书)昆士兰大学毕业证成绩单原版一模一样
办理学位证(UQ文凭证书)昆士兰大学毕业证成绩单原版一模一样
 

Blockchain introduction

  • 1. Login to Metamask Send transaction (buy creeptoma) Call infura service (currently free) Select one node
 +
 execute transaction/query Choose one node
 execute transaction/query Send query directly to infura (without login. i.e: get creeptoma price) Send directly to one node MainNet Blockchain TestNet Blockchain
  • 2.
  • 3. contract Creeptoma { function int getCreeptomaPrice(){} } Deploy - directly to one node - through infura 0x3cd9498845833058e48fde… Creetoma.getCreeptomaPrice() Call method of smart contract Local Blockchain TestNet Blockchain (8GB) MainNet Blockchain (>1TB)
  • 4.
  • 5. 20,000 gas 3$/ 1gas 1$/ 1gas 3$/ 1gas : gas price 20,000: gas used // Estimate: // Gas price: 1 gas = 10 Gwei // 1 Ether = 650$ // return a string export function estimateGasToUSD(gas) { return gweiToEther(gas * 10 * 750) + '$'; }
  • 6.
  • 8. On Chain vs Off Chain Solution