2019 3rd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT)
Blockchain is a decentralized distributed database. It is among the new generation technologies a... more Blockchain is a decentralized distributed database. It is among the new generation technologies and its popularity is increasing day by day due to its attractive advantages. Although it was introduced in 1992 it was first used in 2008 with the Bitcoin virtual currency, which was laid experimentally by a developer codenamed Satoshi Nakamoto. After Bitcoin's success, Blockchain technology has been used in different fields. Not only in the financial sector; In many sectors such as health, energy, agriculture and supply chain management, applications have been developed in line with the needs. Security, first-hand operation, transparency and privacy advantages are the main reasons for the spread of Blockchain technology. By evaluating the advantages it provides, many companies have started to invest in Blokchains technology and the number of Blokchains projects has started to increase. HAVELSAN is a large-scale Defense Industry Software company, researching new generation technologies and conducting studies to create value at both the firm and national level. Blockchain is one of these technologies. Most of the projects and products made before the Blockchain were produced in the traditional structure using the central database. Blockchain still does not provide a central database performance. Although the value added will be added to the projects to be carried out with the block chain, the problem will arise where high transaction performance is important. Currently, Blockchain; ensures the accuracy, security and integrity of the data. However, as the Blockchain network grows, productivity decreases and is difficult to manage. The proposed solution to improve performance is to establish a hybrid model and to ensure that a centralized database works together with the Blockchain network. In this study, how to design a hybrid structure using Blockchain and central database, installation of the system and the problems encountered will be explained.
2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT), 2020
Covid-19 salgınıyaşadı ğımız yüzyılın en önemli küresel sağlık felaketlerinden ve insanlığın karş... more Covid-19 salgınıyaşadı ğımız yüzyılın en önemli küresel sağlık felaketlerinden ve insanlığın karşılaştığıen büyük zorluklardan biri olarak kabul edilmektedir. Covid-19 salgı nıkısa sürede dünyanın tamamına yayıldıve tüm ülkeler için sağlık, ekonomik, eğitim, ulaşım, çevresel ve sosyal zorluklar oluşturdu. Tüm ülkeler virüsün yayılmasınıengellemek amacıyla önlemler aldı. Virüs damlacık yoluyla bulaştığıiçin teması mümkün olduğunca azaltmak önemli hale geldi. Bu nedenle insanlar işlemlerini evden çıkmadan yürütmeye çalı şmışlardır. Teknolojik altyapıevden çıkmadan yürütülebilecek işlemlerin sınırlarını belirlemiştir. İnsanlar teknolojik imkanlar doğrultusunda çalışmalarını, alışverişlerini, görüşmelerini dijital olarak sağlayabilmişlerdir. Teknolojik altyapıbu süreçte ülkelerin salgını yönetmesinde ve insanların ihtiyaçlarınıkarşı layabilmesinde önemli rol oynamıştır. Ülkeler teknolojik kabiliyetleri sayesinde vatandaşlarının salgın döneminde dijital olarak işlem yapabilmesine olanak vermiştir. Covid-19 salgı nıdünyada birçok sektör ve iş modelini etkileyecektir. Yeni teknolojilerin hayatımıza girme sürecini hızlandırması beklenmektedir. Blok zinciri potansiyel olarak bu yeni teknolojilerden biridir. Blok zinciri teknolojisi Covid-19 salgınının etkisi ile yeniden tasarlanacak dünyada birçok sektörü dönüştürme potansiyeline sahiptir. Yapılan çalı şmada Covid-19 salgınıile dünyada yaşanacak değişimin etkisi ile geliştirilebilecek blok zinciri uygulamalarıve bu uygulamaların getireceği yeni iş modelleri incelenmiştir. Kripto para, dijital kimlik, tedarik zinciri yönetimi, sağlık kayıtlarının yönetimi, enerji dağı tımıve ticareti konularısalgının etkisi ile birlikte önemli hale gelecek muhtemel blok zinciri uygulamalarıdır. Bu uygulamaların geliştirilmesi ülkelerin dijital dönüşüm çalı şmalarınıtamamlamasına katkısağlayarak verimliliği artı racaktır. Bunun yanında teknolojik altyapının geliştirilmesi ile afet, salgın gibi ulusal güvenliği tehdit eden olağan dı şıdurumlarda ülkelerin süreci daha iyi yönetmesi sağlanabilecektir.
2019 International Symposium on Networks, Computers and Communications (ISNCC), 2019
Blockchain is an emerging technology which gained popularity with Bitcoin, which is the most famo... more Blockchain is an emerging technology which gained popularity with Bitcoin, which is the most famous application of that technology. After Bitcoin became popular, new usage areas of Blockchain was started to being investigating because of the advantage of the technology such as security, agentless transaction, and transparency. HAVELSAN is a large scale software company, investigates on new generation technologies and works on to adapt it. In this manner, Blockchain is one of these new generation technologies that brings impressive advantages. Blockchain is a decentralized transactional database technology in which all transactions are encrypted on blocks, allowing the buyer and seller to make a secure exchange between themselves directly. In this transactional database technology, all transactions are recorded in a structure called “Distributed (Open) Ledger”, where transactions are held and open to all users. In the traditional approach (central database), when the database is controlled by a third party, the copy of the database in the Blockchain approach is available to all participants. This prevents the data from being corrupted and destroyed. In order to be able to modify this distributed structure, the relevant changes must be recorded on all computers in the system. The success of any type of cyber attack becomes impossible because of the necessity of accepting changes in the vast majority of the network. Smart Contract is a key concept of Blockchain in order to gather all these advantages. Smart Contracts not only define the rules and penalties around an agreement in the same way that a traditional contract does, but also automatically enforce those obligations. HAVELSAN is a large scale software company that has wide range of operation field, so there could be different applications of Blockchain with regard to company operation fields. Combining this variety with the importance of Smart Contract concept, which could be counted as the basis for most Blockchain applications, it is beneficial to establish a strong based Smart Contract frame before starting to build our own applications with Blockchain. Therefore, we aimed to build our customized Smart Contract structure before developing miscellaneous applications. In this article, HAVELSAN Blockchain Smart Contract framework establishment; which infrastructures were used, the problems encountered during the development and the most applicable way of use this framework will be explained.
2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT), 2020
Özet— Tarihin ilk yıllarından itibaren alım-satım gibi güvene dayalı ekonomik işlemler merkezi ot... more Özet— Tarihin ilk yıllarından itibaren alım-satım gibi güvene dayalı ekonomik işlemler merkezi otoriteler tarafından kayıt altına alınmaktadır. Kağıdın icadı ile kayıt işlemleri daha düzenli ve detaylı bir şekilde yapılmaya başlanmıştır. Son yıllarda da bilgisayarların yaygınlaşması ile birlikte kayıt işlemleri dijital olarak yapılarak kayıtların yönetimi kolaylaştırılmıştır. Yaşanan her teknolojik gelişme veri kayıt işlemlerinde kolaylık ve hız sağlamıştır. Gelişen teknoloji ile birlikte işlemler hızlanmış ancak kayıtların yönetim merkezi otoritelerin kontrolünde kalmıştır. Dağıtık defter teknolojisi kayıtların merkezi otoritelerin kontrolünden çıktığı yeni bir yaklaşım sunmaktadır. Dağıtık defter teknolojisi merkezi bir veritabanı veya merkezi yönetimi olmayan verilerin katılımcılarda dağıtık olarak tutuldğu eşler arası ağdır. İlk dağıtık defter uygulaması 2008 yılındaki ekonomik krizin ardından ortaya çıkan Bitcoin ödeme sistemi ve kripto parasıdır. Bitcoin’in ortaya çıkmasında merkezi otoritelerin verdiği kötü ekonomik kararlar etkili olmuştur. Bitcoin ile amaç mevcut finansal sistemleri merkezi otoritelerin kontrolünden çıkarmaktır. Bitcoin’in popüler hale gelmesiyle birlikte arkasındaki blok zinciri teknolojisi dikkat çekmeye başlamıştır. Başlangıçta Bitcoin nedeniyle blok zinciri teknolojisi finans sektörü ile özdeşleştirilse de tedarik zinciri, sağlık, tarım, enerji gibi farklı sektörde kullanımına yönelik çalışmalar yapılmaya başlanmıştır. Blok zinciri teknolojisinin farklı sektörlerde kullanılabilmesi için Hyperledger, Ethereum ve Corda gibi blok zinciri altyapıları geliştirilmiştir. Ancak yapılan geliştirme çalışmalarında blok zinciri teknolojisinin hız ve ölçeklenebilirlik açısından eksiklikleri olduğu görülmüştür. Bu nedenle hız ve ölçeklenebilirlik açısından gelişmiş yeni dağıtık defter teknolojileri geliştirilmiştir. Yeni geliştirilen popüler dağıtık defter teknolojisi türleri Directed Acyclic Graph, Hashgraph, Tempo ve Holochain’dir. Yeni nesil dağıtık defter teknolojilerinin öne çıkan farklı özellikleri bulunmaktadır. Yapılan çalışmada blok zinciri ile yeni nesil dağıtık defter teknolojileri karşılaştırılmıştır.
Advances in Science, Technology and Engineering Systems Journal, 2021
Central authorities have registered economic transactions based on trust since the dawn of time. ... more Central authorities have registered economic transactions based on trust since the dawn of time. With the advent of paper, methods for documenting transactions and records became more difficult and detailed. With the widespread use of computers in recent years, digital recording has made record keeping easier and since then every technical advancement has made data recording more convenient and faster. Transactions have accelerated as technology has advanced, but the maintenance of records has remained under the jurisdiction of the authorities. The use of distributed ledger systems allows data to be released from the control of central authorities. A distributed ledger is a peer-to-peer network in which non-centralized data is shared by participants. The Bitcoin payment system and cryptocurrency, which arose after the 2008 financial crisis, was the first distributed ledger application. Central authorities' poor economic decisions aided in the rise of Bitcoin. The aim of Bitcoin is to make the current financial systems liberal from the influence of central authorities. With the rise in popularity of Bitcoin, the blockchain technology that underpins it has begun to garner interest. While blockchain technology was initially associated with the financial sector due to Bitcoin, research into its use in other sectors such as supply chain, records management, electoral systems, notary services, file systems, energy and artificial intelligence has begun. Several Blockchain infrastructures have been built to allow the use of blockchain technology in a variety of industries. However, it has been revealed in practical approaches that blockchain technology has limitations in terms of speed and scalability. As a result, new distributed ledger technologies with increased speed and scalability have been established. Hashgraph, Tangle, Tempo, Holochain are examples of newly developed distributed ledger technologies. Different influential features distinguish new generation distributed ledger technologies from the conventional Blockchain methods, which can yield into several and practical modern applications. In this study, Blockchain and new generation Distributed Ledger Technologies are compared and possible future applications are outlined.
2018 2nd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT), 2018
Age has always been an important feature of our identity. It is also an important factor in our s... more Age has always been an important feature of our identity. It is also an important factor in our social life. Predictions of age made with artificial intelligence can be applied to many areas such as intelligent human-machine interface development, security, cosmetics, electronic commerce. In this study, face images of persons were trained using convolutional neural networks, and age and gender were tried to be predicted with high success rate. Inception V1 convolutional neural network model developed by Google was used for training. Inception V1 model is already trained in the VGGFace2 dataset. Transfer learning provided by Deep Learning, the dataset is trained on this model. The IMDB dataset with face images with gender and age tags was selected as the dataset. There are 460.723 images in this dataset. 260.428 pictures in the IMDB dataset are used for training. As a result of the study, achievement rate of 70.3% in age prediction and 97% in gender prediction has been achieved.
Advances in Science, Technology and Engineering Systems Journal, 2020
Blockchain is a new generation technology that allows the central control mechanism or trusted au... more Blockchain is a new generation technology that allows the central control mechanism or trusted authority to be removed, spreading the encrypted data across all participants in the network in a distributed database structure instead of central trust. The Smart Contract structure, which defines the rules and flow that allow the things we value to operate automatically as determined without the need for an external trigger mechanism, is the core element of this technology. Blockchain has gained popularity with its most famous application, Bitcoin. After Bitcoin became popular, it turned out that Blockchain might have new uses due to the advantage of technology such as security, brokerage, and transparency, and these areas are being investigated. Many big companies have started to invest in this technology in the face of the opportunities brought by Blockchain. HAVELSAN is a largescale software company that studies and adapts new generation technologies. Blockchain technology has become of the new generation technologies that HAVELSAN is interested in due to its impressive advantages. HAVELSAN has a wide range of activities, so the company can develop various Blockchain-based applications depending on these areas. Combining this diversity with the importance of the Smart Contract concept, which can be considered as the basis for most Blockchain applications, it is decided to create a strong Smart Contract framework before starting to build different applications with Blockchain technology. The creation of HAVELSAN Blockchain Smart Contract Framework; which infrastructures are used during the development phase, the problems encountered during development and the structure of the most suitable applications to be created with the framework to be developed will be explained in this article.
2019 3rd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT)
Blockchain is a decentralized distributed database. It is among the new generation technologies a... more Blockchain is a decentralized distributed database. It is among the new generation technologies and its popularity is increasing day by day due to its attractive advantages. Although it was introduced in 1992 it was first used in 2008 with the Bitcoin virtual currency, which was laid experimentally by a developer codenamed Satoshi Nakamoto. After Bitcoin's success, Blockchain technology has been used in different fields. Not only in the financial sector; In many sectors such as health, energy, agriculture and supply chain management, applications have been developed in line with the needs. Security, first-hand operation, transparency and privacy advantages are the main reasons for the spread of Blockchain technology. By evaluating the advantages it provides, many companies have started to invest in Blokchains technology and the number of Blokchains projects has started to increase. HAVELSAN is a large-scale Defense Industry Software company, researching new generation technologies and conducting studies to create value at both the firm and national level. Blockchain is one of these technologies. Most of the projects and products made before the Blockchain were produced in the traditional structure using the central database. Blockchain still does not provide a central database performance. Although the value added will be added to the projects to be carried out with the block chain, the problem will arise where high transaction performance is important. Currently, Blockchain; ensures the accuracy, security and integrity of the data. However, as the Blockchain network grows, productivity decreases and is difficult to manage. The proposed solution to improve performance is to establish a hybrid model and to ensure that a centralized database works together with the Blockchain network. In this study, how to design a hybrid structure using Blockchain and central database, installation of the system and the problems encountered will be explained.
2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT), 2020
Covid-19 salgınıyaşadı ğımız yüzyılın en önemli küresel sağlık felaketlerinden ve insanlığın karş... more Covid-19 salgınıyaşadı ğımız yüzyılın en önemli küresel sağlık felaketlerinden ve insanlığın karşılaştığıen büyük zorluklardan biri olarak kabul edilmektedir. Covid-19 salgı nıkısa sürede dünyanın tamamına yayıldıve tüm ülkeler için sağlık, ekonomik, eğitim, ulaşım, çevresel ve sosyal zorluklar oluşturdu. Tüm ülkeler virüsün yayılmasınıengellemek amacıyla önlemler aldı. Virüs damlacık yoluyla bulaştığıiçin teması mümkün olduğunca azaltmak önemli hale geldi. Bu nedenle insanlar işlemlerini evden çıkmadan yürütmeye çalı şmışlardır. Teknolojik altyapıevden çıkmadan yürütülebilecek işlemlerin sınırlarını belirlemiştir. İnsanlar teknolojik imkanlar doğrultusunda çalışmalarını, alışverişlerini, görüşmelerini dijital olarak sağlayabilmişlerdir. Teknolojik altyapıbu süreçte ülkelerin salgını yönetmesinde ve insanların ihtiyaçlarınıkarşı layabilmesinde önemli rol oynamıştır. Ülkeler teknolojik kabiliyetleri sayesinde vatandaşlarının salgın döneminde dijital olarak işlem yapabilmesine olanak vermiştir. Covid-19 salgı nıdünyada birçok sektör ve iş modelini etkileyecektir. Yeni teknolojilerin hayatımıza girme sürecini hızlandırması beklenmektedir. Blok zinciri potansiyel olarak bu yeni teknolojilerden biridir. Blok zinciri teknolojisi Covid-19 salgınının etkisi ile yeniden tasarlanacak dünyada birçok sektörü dönüştürme potansiyeline sahiptir. Yapılan çalı şmada Covid-19 salgınıile dünyada yaşanacak değişimin etkisi ile geliştirilebilecek blok zinciri uygulamalarıve bu uygulamaların getireceği yeni iş modelleri incelenmiştir. Kripto para, dijital kimlik, tedarik zinciri yönetimi, sağlık kayıtlarının yönetimi, enerji dağı tımıve ticareti konularısalgının etkisi ile birlikte önemli hale gelecek muhtemel blok zinciri uygulamalarıdır. Bu uygulamaların geliştirilmesi ülkelerin dijital dönüşüm çalı şmalarınıtamamlamasına katkısağlayarak verimliliği artı racaktır. Bunun yanında teknolojik altyapının geliştirilmesi ile afet, salgın gibi ulusal güvenliği tehdit eden olağan dı şıdurumlarda ülkelerin süreci daha iyi yönetmesi sağlanabilecektir.
2019 International Symposium on Networks, Computers and Communications (ISNCC), 2019
Blockchain is an emerging technology which gained popularity with Bitcoin, which is the most famo... more Blockchain is an emerging technology which gained popularity with Bitcoin, which is the most famous application of that technology. After Bitcoin became popular, new usage areas of Blockchain was started to being investigating because of the advantage of the technology such as security, agentless transaction, and transparency. HAVELSAN is a large scale software company, investigates on new generation technologies and works on to adapt it. In this manner, Blockchain is one of these new generation technologies that brings impressive advantages. Blockchain is a decentralized transactional database technology in which all transactions are encrypted on blocks, allowing the buyer and seller to make a secure exchange between themselves directly. In this transactional database technology, all transactions are recorded in a structure called “Distributed (Open) Ledger”, where transactions are held and open to all users. In the traditional approach (central database), when the database is controlled by a third party, the copy of the database in the Blockchain approach is available to all participants. This prevents the data from being corrupted and destroyed. In order to be able to modify this distributed structure, the relevant changes must be recorded on all computers in the system. The success of any type of cyber attack becomes impossible because of the necessity of accepting changes in the vast majority of the network. Smart Contract is a key concept of Blockchain in order to gather all these advantages. Smart Contracts not only define the rules and penalties around an agreement in the same way that a traditional contract does, but also automatically enforce those obligations. HAVELSAN is a large scale software company that has wide range of operation field, so there could be different applications of Blockchain with regard to company operation fields. Combining this variety with the importance of Smart Contract concept, which could be counted as the basis for most Blockchain applications, it is beneficial to establish a strong based Smart Contract frame before starting to build our own applications with Blockchain. Therefore, we aimed to build our customized Smart Contract structure before developing miscellaneous applications. In this article, HAVELSAN Blockchain Smart Contract framework establishment; which infrastructures were used, the problems encountered during the development and the most applicable way of use this framework will be explained.
2020 4th International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT), 2020
Özet— Tarihin ilk yıllarından itibaren alım-satım gibi güvene dayalı ekonomik işlemler merkezi ot... more Özet— Tarihin ilk yıllarından itibaren alım-satım gibi güvene dayalı ekonomik işlemler merkezi otoriteler tarafından kayıt altına alınmaktadır. Kağıdın icadı ile kayıt işlemleri daha düzenli ve detaylı bir şekilde yapılmaya başlanmıştır. Son yıllarda da bilgisayarların yaygınlaşması ile birlikte kayıt işlemleri dijital olarak yapılarak kayıtların yönetimi kolaylaştırılmıştır. Yaşanan her teknolojik gelişme veri kayıt işlemlerinde kolaylık ve hız sağlamıştır. Gelişen teknoloji ile birlikte işlemler hızlanmış ancak kayıtların yönetim merkezi otoritelerin kontrolünde kalmıştır. Dağıtık defter teknolojisi kayıtların merkezi otoritelerin kontrolünden çıktığı yeni bir yaklaşım sunmaktadır. Dağıtık defter teknolojisi merkezi bir veritabanı veya merkezi yönetimi olmayan verilerin katılımcılarda dağıtık olarak tutuldğu eşler arası ağdır. İlk dağıtık defter uygulaması 2008 yılındaki ekonomik krizin ardından ortaya çıkan Bitcoin ödeme sistemi ve kripto parasıdır. Bitcoin’in ortaya çıkmasında merkezi otoritelerin verdiği kötü ekonomik kararlar etkili olmuştur. Bitcoin ile amaç mevcut finansal sistemleri merkezi otoritelerin kontrolünden çıkarmaktır. Bitcoin’in popüler hale gelmesiyle birlikte arkasındaki blok zinciri teknolojisi dikkat çekmeye başlamıştır. Başlangıçta Bitcoin nedeniyle blok zinciri teknolojisi finans sektörü ile özdeşleştirilse de tedarik zinciri, sağlık, tarım, enerji gibi farklı sektörde kullanımına yönelik çalışmalar yapılmaya başlanmıştır. Blok zinciri teknolojisinin farklı sektörlerde kullanılabilmesi için Hyperledger, Ethereum ve Corda gibi blok zinciri altyapıları geliştirilmiştir. Ancak yapılan geliştirme çalışmalarında blok zinciri teknolojisinin hız ve ölçeklenebilirlik açısından eksiklikleri olduğu görülmüştür. Bu nedenle hız ve ölçeklenebilirlik açısından gelişmiş yeni dağıtık defter teknolojileri geliştirilmiştir. Yeni geliştirilen popüler dağıtık defter teknolojisi türleri Directed Acyclic Graph, Hashgraph, Tempo ve Holochain’dir. Yeni nesil dağıtık defter teknolojilerinin öne çıkan farklı özellikleri bulunmaktadır. Yapılan çalışmada blok zinciri ile yeni nesil dağıtık defter teknolojileri karşılaştırılmıştır.
Advances in Science, Technology and Engineering Systems Journal, 2021
Central authorities have registered economic transactions based on trust since the dawn of time. ... more Central authorities have registered economic transactions based on trust since the dawn of time. With the advent of paper, methods for documenting transactions and records became more difficult and detailed. With the widespread use of computers in recent years, digital recording has made record keeping easier and since then every technical advancement has made data recording more convenient and faster. Transactions have accelerated as technology has advanced, but the maintenance of records has remained under the jurisdiction of the authorities. The use of distributed ledger systems allows data to be released from the control of central authorities. A distributed ledger is a peer-to-peer network in which non-centralized data is shared by participants. The Bitcoin payment system and cryptocurrency, which arose after the 2008 financial crisis, was the first distributed ledger application. Central authorities' poor economic decisions aided in the rise of Bitcoin. The aim of Bitcoin is to make the current financial systems liberal from the influence of central authorities. With the rise in popularity of Bitcoin, the blockchain technology that underpins it has begun to garner interest. While blockchain technology was initially associated with the financial sector due to Bitcoin, research into its use in other sectors such as supply chain, records management, electoral systems, notary services, file systems, energy and artificial intelligence has begun. Several Blockchain infrastructures have been built to allow the use of blockchain technology in a variety of industries. However, it has been revealed in practical approaches that blockchain technology has limitations in terms of speed and scalability. As a result, new distributed ledger technologies with increased speed and scalability have been established. Hashgraph, Tangle, Tempo, Holochain are examples of newly developed distributed ledger technologies. Different influential features distinguish new generation distributed ledger technologies from the conventional Blockchain methods, which can yield into several and practical modern applications. In this study, Blockchain and new generation Distributed Ledger Technologies are compared and possible future applications are outlined.
2018 2nd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT), 2018
Age has always been an important feature of our identity. It is also an important factor in our s... more Age has always been an important feature of our identity. It is also an important factor in our social life. Predictions of age made with artificial intelligence can be applied to many areas such as intelligent human-machine interface development, security, cosmetics, electronic commerce. In this study, face images of persons were trained using convolutional neural networks, and age and gender were tried to be predicted with high success rate. Inception V1 convolutional neural network model developed by Google was used for training. Inception V1 model is already trained in the VGGFace2 dataset. Transfer learning provided by Deep Learning, the dataset is trained on this model. The IMDB dataset with face images with gender and age tags was selected as the dataset. There are 460.723 images in this dataset. 260.428 pictures in the IMDB dataset are used for training. As a result of the study, achievement rate of 70.3% in age prediction and 97% in gender prediction has been achieved.
Advances in Science, Technology and Engineering Systems Journal, 2020
Blockchain is a new generation technology that allows the central control mechanism or trusted au... more Blockchain is a new generation technology that allows the central control mechanism or trusted authority to be removed, spreading the encrypted data across all participants in the network in a distributed database structure instead of central trust. The Smart Contract structure, which defines the rules and flow that allow the things we value to operate automatically as determined without the need for an external trigger mechanism, is the core element of this technology. Blockchain has gained popularity with its most famous application, Bitcoin. After Bitcoin became popular, it turned out that Blockchain might have new uses due to the advantage of technology such as security, brokerage, and transparency, and these areas are being investigated. Many big companies have started to invest in this technology in the face of the opportunities brought by Blockchain. HAVELSAN is a largescale software company that studies and adapts new generation technologies. Blockchain technology has become of the new generation technologies that HAVELSAN is interested in due to its impressive advantages. HAVELSAN has a wide range of activities, so the company can develop various Blockchain-based applications depending on these areas. Combining this diversity with the importance of the Smart Contract concept, which can be considered as the basis for most Blockchain applications, it is decided to create a strong Smart Contract framework before starting to build different applications with Blockchain technology. The creation of HAVELSAN Blockchain Smart Contract Framework; which infrastructures are used during the development phase, the problems encountered during development and the structure of the most suitable applications to be created with the framework to be developed will be explained in this article.
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