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Technical characteristics and innovation (6/6)

4. digital identity Currently, there are a series of different blockchain protocols in the blockchain ecosystem, including smart assets, smart contracts, anti-counterfeiting traceability, application chain tracking and the most common financial applications, and blockchain digital identity can record all assets of each identity and transaction and reverse behavior without any omission. Chain and if blocks as the application more widely accepted by the public and the world, more need to know each other to cooperate with us and deal with the identity of the names defined, at the same time, to really go to the heart, and make the personal block chain, financial institutions in the financial services and cooperation can play the role of a more fair, and can be built in the yuan block chain application layer, make the application layer can be Shared to consensus digital identity information of the layer. However, in many blockchain protocols, especially the public blockchain, digital identity is often completed in the non-consensus layer in the same way as the traditional centralized processing. In Achain blockchain, the super-sovereign digital identity does not rely on any centralized or third-party entity for verification, so it can work together with the smart assets on Achain to develop a large and feasible decentralized application system. People's life is stepping into the digital age step by step, and the super-sovereign digital identity can make any asset transfer in an unprecedented and convenient way, business and social can interact with all kinds of digital assets, so that the value of the Internet really into our future.

5. consensus mechanism the consensus mechanism is established on the basis of Result Delegated Proof of Stake (RDPOS) consensus mechanism by default.

6. smart contract In the ETH blockchain system, a smart contract is an object on a chain that contains code and data storage. The drafters of a contract can describe the terms of the contract in a supported computer language, set execution conditions, and perform operations upon completion of the execution conditions, participation interfaces, and so on. After the contract drawer registers the contract on the blockchain, other users can participate in the contract by calling the interface. Under the premise that the content of the contract is correctly expressed in the contract language, when the execution condition is reached, the system will perform the set operation according to the description of the contract code, and there will be no phenomenon that the participants refuse to perform the terms in reality.

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Technical characteristics and innovation (3/6)

1. algorithm encryption technology SHA (Secure Hash Algorithm) is a series of cryptographic Hash functions designed by the national security agency (NSA) and released by the national institute of standards and technology (NIST). Through the customization of SHA512 encryption technology, DOA developed the exclusive sha512-doa encryption technology to ensure the data security of DOA network.

2. Ring Topology Hub technology DOA's Ring Topology Hub technology connects multiple chains to a Hub, making it easy for digital asset terminals to achieve one-click cross-link and transformation. The advantage of a ring is that the topology consumes much less resources than a star or tree. With fewer nodes and closer distance, it may not be obvious, but with distance and more nodes, the advantage of ring network will be obvious.

3. SDK and baas platform DOA sovereign alliance chain will provide OPEN API for the upper layer application and SDK encapsulated API supply and call, so that the application can access a variety of resources in the DOA sovereign alliance chain network through SDK, including account, transaction, ledger, smart contract, monitoring (sent by smart contract or block generated) events and so on. For developers and testers of community applications, it is not easy to build a set of distributed blockchain solution, which requires both investment in hardware infrastructure and all-round development and operation management. DOA sovereign alliance chain will launch a fully open blockchain service (BaaS) platform, providing one-stop test network construction, distributed ledger content visualization, intelligent contract development and testing, network monitoring and analysis and other functions. The blockchain simulation environment provided by the BaaS platform will be close to the real world application scenarios, allowing developers to easily migrate and publish proven business models to the DOA sovereign federation chain The rise of the Internet and mobile applications has made the use of digital identity more and more common. However, different centralized service providers need to apply for a new user name and password every time, which leads to the risk of data leakage, and the complicated and repeated registration process is also a waste of time. For this series of problems, the industry is looking for new solutions, in which the blockchain digital identity solutions stand out.

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DOA Platform Components (4/4)

----DOA Storage Clinical records of while in the form of electronic documents is hardly more than a few megabytes of storage space, but the medical image data at hundreds of megabytes and even more, the size of the genetic data according to different data processing phase, the required capacity is likely to have more than thousands of megabytes, all the data stored in the block chain is not desirable. Therefore, DOA encrypts data with private keys that can only be decrypted by the user, and stores the data outside the blockchain in storage space built by IFPS based file system and internal data network, but only stores the hash value of the data in the blockchain. In addition to using their personal devices (mobile phones, computers, etc.) as the main data storage space, users can also store medical information in the storage space outside the DOA core layer blockchain. Based on such stored data, users can easily access a variety of personalized digital medical care services, and the integrity of the stored data can be verified by the hash value stored in the blockchain. In order to cope with the loss of personal device management data due to the failure or loss of smart phones and computers where users store data. DOA provides an internal data backup system and will provide users with 1GB of free medical information storage space. Although the average user can store almost all of their clinical records and medical image data, it may be difficult to meet the needs of users who have genetic data or frequent hospital visits and generate more medical records through various services. In this case, DOA will provide additional storage space at a very low price. For all these storage Spaces, DOA will comply with the international medical information management standards set forth in ACTS such as HIPAA.

----DOA SearchSystem As one of the core functions of DOA, which operates its own separate search system, users can use the data search function to obtain medical information of people who meet certain conditions. In addition, all users can manage their personal information to decide whether they can be the object of public search. Therefore, the search system is basically only for those users who are allowed to be searched. Users can set search criteria including search license and search license options. If the user is allowed to be searched, the DOA search system stores index information about the user's data. Medical researchers can then use search systems to retrieve users of the data they want, and trade data in a peer-to-peer (P2P) format through data owners and smart contracts. In order to minimize exposure of user information, DOA use Intel software protection extension system (SGX), in a sealed space to store and manage sensitive user information, so that even the DOA search system administrator cannot understand the registered users of information in the system, to minimize the possibility of user information exposure, so that the personal information storage is more security. If the user does not want the data to be directly retrieved by the DOA search system, but is still willing to sell or donate the data when they qualify, they can participate in the transaction of the data in a slightly different way. Users who want to get data from others can find the data through the DOA real-time search system by simply entering information such as the search conditions for the required data and the payment for providing the data in the DOA network. At this point, the user who wants to sell data can determine whether his data meets this condition from the personal device, and participate in the transaction of data through the push notification function, or even not actively participate, all these functions can be completed automatically in the background.

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DOA Platform Components (2/4)

The DOA platform is a distributed application based on EVM. EVM is now widely used in the development of intelligent contracts. From the aspects of time cost, money cost, universality and reliability, the EVM based platform is more efficient than the blockchain network and the platform based on it. In addition, the development based on EVM can theoretically run on evm-enabled quantum chain (Qtum) and E0S and other types of blockchain platforms. According to the technical support of these blockchain platforms, DOA can flexibly select the operating platform. Among these blockchain platforms, the bitcoin platform of quantum chain currently borrows the protocol algorithm in the form of POS, which is the fastest scalable platform supporting EVM. DOA platform has three main types of information: DOA currency information, personal information and medical information. These data storage methods use distributed storage based on IFPS file system. Although it is the most ideal method to store all information on the blockchain, we can only minimize the amount of information stored directly on the blockchain due to practical limitations such as cost, storage space and performance. Personal and medical information that takes up a large amount of storage space will be stored in an encrypted form outside the blockchain, and only the hash value corresponding to them will be stored on the blockchain.

----DOA Account Accounts that can be created on the DOA platform can be divided into ordinary user accounts, medical service provider accounts (medical personnel, medical institutions, medical care applications, etc.) and medical researcher accounts according to their purposes of use. Depending on their actual roles in the DOA ecosystem, they require different capabilities, permissions, and reliability. The following table summarizes the differences between the three types of accounts: In principle, ordinary user account is prohibited from accessing another person's account. Although the account owner can manage the account on behalf of another person if he/she cannot manage the account, it can only be done with his/her consent. There are two types of people who want to view others' medical information: one is the application of medical service providers for the purpose of providing medical services. Medical consumers such as sometimes happens by accident or disease lose consciousness makes it impossible to personal identity certification of the situation, and in order to deal with this kind of situation, emergency medical consumer account must be blood types, and other important information can be a separate record, special circumstances, health care providers in their consent, also can access a separate record of information. The other is the application of medical information for medical research and development of medical care services. In this case, they need to be authenticated as independent medical researchers and authenticated as account owners. However, medical service providers and medical researchers need to conduct qualification certification for account registration, so as to effectively distinguish the information filled in by medical service providers from the information generated in ordinary accounts.

----DOA medical service provider qualification certification system The DOA platform has a healthcare provider qualification system that differentiates healthcare providers from regular users. This authentication system USES a hybrid authentication system, which combines a centralized authentication method directly authenticated by a trusted authority with a decentralized authentication method from an already certified P2P. Among them, the final result of P2P authentication will be decided by the vote of the authentication participants. The results of individual assessors' votes will not be published during this process, and will therefore be assessed using an anonymous authentication protocol. In order to guarantee the value of medical information recorded on the DOA platform, the data generator must be certified as a doctor, and the medical record filled by a certified medical service provider is naturally of higher value. If it is a medical institution, it also needs to confirm whether it has passed the qualification certification.

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DOA Platform Architecture

----DOA core layer Because the amount of data that can be stored on the blockchain is very limited, a separate storage space is needed for information such as medical data. The core layer is a distributed database for storing data, and the latest encryption technology in DOA medical data network is used to protect data. The medical data generated and transmitted in DOA application is encrypted in the application layer through DOASDK, and then transmitted later, so as to ensure that only the data holder can decrypt the data. The core layer is accessible through the service layer of the DOA. In addition, DOA's core layer provides a backup and recovery system for stored data so that it can be safely stored without being lost.

----DOA service layer The service layer provides all the core functions including connecting DOA applications to the core layer and managing user information. The service layer is driven by the block chain and based on the information stored in the block chain, it performs the data input/output function through the connection with the DOA core layer.

----DOA application layer DOA application layer is a general term for applications that manage and utilize medical information through the platform, and it includes all kinds of applications in mobile and web environments. The service layer provides support for applications to access platform data. With the upcoming SDK, application development will become much easier. Even without the SDK, you can develop applications that connect to the DOA platform if you follow the upcoming API and development protocols. Some practical applications and service examples based on DOA development are described in detail in the service examples in chapter 5 below.

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Vision and value of DOA

"Redistribute the value of personal medical information, improve the quality of medical access and services, and accelerate the decentralization of personal medical information." The DOA team aims to achieve the goal of decentralizing personal medical information based on expertise in the medical field. The DOA aims to transform the medical information management system from institutional-oriented to patient-oriented in order to ensure the reliability, transparency and security of medical information exchange. Based on the medical information stored on the platform, DOA will further develop a variety of services related to quality health care, and it will also set up a unique reward mechanism to provide more value to all participants on the platform.