Is there a class or sequence diagram for BitcoinCore?

CheckBlock() --> Checks the info inside a block AcceptBlock() --> Additional checks + write to disk ProcessNewBlock() --> Calls both of the above and also a function called ActivateBestChain(), which decides whether propagation to the network is warranted, among other things. ConnectBlock() and DisconnectBlock() Append the block in question to the end of the blockchain (or take it off from there), linking it with the previous block's hash.

Bitcoin needs to be industrial-strength code, so expect to see checks everywhere, for anything that could possibly happen (i.e., >1 coinbase transactions in a block, etc.). Moreover, some database operations are atomic, there are decisions when to propagate new blocks to the network, and to further complicate matters, the source code itself is the best documentation out there (slowly changing though, Andreas' Book is just a start).

Let's start with CheckBlock(), which is called by other functions:

Its sequence of...

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No problem.

A Sequence diagram is used to show the communication, i.e. method calls, between a group of Objects for a specific execution path.

I put the important part in bold text above. Sequence diagrams show how multiple objects communicate, not a single object.

There could be hundreds and maybe thousands of possible execution paths involving many objects. There is no way to create a program that can create Sequence diagrams. Sequence diagrams are created manually and by a human. The human is deciding what goes on the Sequence diagram.

You keep mentioning that you want to show all the methods of a Class. Why don't you create a Class diagram then that shows...

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Sequence diagram is the most common kind of interaction diagram, which focuses on the message interchange between a number of lifelines.

Sequence diagram describes an interaction by focusing on the sequence of messages that are exchanged, along with their corresponding occurrence specifications on the lifelines.

The following nodes and edges are typically drawn in a UML sequence diagram: lifeline, execution specification, message, combined fragment, interaction use, state invariant, continuation, destruction occurrence.

Major elements of the sequence diagram are shown on the picture below.

Major elements of UML sequence diagram.

You can find some sequence diagram examples here:


Lifeline is a named element which represents an individual participant in the interaction. While parts and structural features may have multiplicity greater than 1, lifelines represent only one interacting entity.

If the...

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While there is an assumption that Sequence Diagrams were made for developers, the truth is that a company’s business staff could use such diagrams to communicate how exactly the business presently currently works by illustrating how the different business objects interact. In addition to this, a business-level sequence diagram may also be used as a “requirements document” to showcase the prerequisites for a future system implementation. It is at the requirements period of a certain project that analysts can take use cases to the next level by offering a more formal level of refinement. It is when this happens that use cases are often refined into sequence diagrams.

A company’s technical staff could utilize sequence diagrams in order to document the behaviour of a future system. It is during the design period that developers and architects utilize the diagram to showcase the system’s object interactions, thereby putting out a more fleshed out overall system design. Besides...

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The new home for Visual Studio documentation is Visual Studio 2017 Documentation on

The latest version of this topic can be found at UML Sequence Diagrams: Guidelines.

In Visual Studio, you can draw a sequence diagram to show an interaction. An interaction is a sequence of messages between typical instances of classes, components, subsystems, or actors.

UML sequence diagrams are part of a UML model and exist only within UML modeling projects. To create a UML sequence diagram, on the Architecture menu, click New UML or Layer Diagram. Find out more about UML sequence diagram elements or UML modeling diagrams in general. For a video demonstration, see Sketching Interactions by using Sequence Diagrams (2010).

To see which versions of Visual Studio support this feature, see Version support for architecture and modeling tools.

Using UML Sequence Diagrams

Basic Steps for Drawing Sequence Diagrams

Creating and Using...

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Hierarchy of UML 2.5 Diagrams, shown as a class diagram. The individual classes are represented just with one compartment, but they often contain up to three compartments.

In software engineering, a class diagram in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among objects.

The class diagram is the main building block of object-oriented modelling. It is used both for general conceptual modelling of the systematics of the application, and for detailed modelling translating the models into programming code. Class diagrams can also be used for data modeling.[1] The classes in a class diagram represent both the main elements, interactions in the application, and the classes to be programmed.

A class with three compartments.

In the diagram, classes are represented with boxes that contain...

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There's no way to automatically generate class diagrams from sequence diagrams; as @rai.skumar said, they serve for different purposes.

Why it's not possible to automatically generate class diagrams from sequence diagrams?

In the development process the class diagram appears, mainly, in two stages: project analysis and architectural project. The last comes right after the first (i.e there is no other "official" stage between them).

In project analysis you get the Use Case (UC) descriptions and then starts to identify which classes are going to appear in your project, for each UC, but doesn't identify neither their responsibilities nor their relationships. Right after that you create the sequence diagram for each UC and then you identify classes relationships and attributes giving you the class analysis diagram.

The class analysis diagram could be automatically generated from a sequence diagram, it's a direct mapping. But it wouldn't be very useful since...

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A sequence diagram is a kind of UML diagram that is used primarily to show the interactions between objects that are represented as lifelines in a sequential order.

Creating sequence diagram

Perform the steps below to create a UML sequence diagram Visual Paradigm uml diagram tools.

Select Diagram > New from the application toolbar. In the New Diagram window, select Sequence Diagram. Click Next. Enter the diagram name and description. The Location field enables you to select a model to store the diagram. Click OK.

Creating actor

To create actor, click Actor on the diagram toolbar and then click on the diagram.

Creating lifeline

To create lifeline, you can click LifeLine on the diagram toolbar and then click on the diagram.

Alternatively, a much quicker and more efficient way is to use Resource Catalog:

Move your mouse pointer over the source lifeline. Press on the Resource Catalog button and drag it out.
Release the...
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Interaction diagrams depict a specific set of interactions between a set of objects. In this fourth article introducing UML from a programmer's perspective, Stephen Palmer compares UML sequence and collaboration diagrams with equivalent Java source code constructs.

Welcome to the fourth article in a series introducing UML and object modeling from a Java programmer's perspective. In the previous articles, we introduced UML class diagrams comparing their contents to classes and interfaces in the Java programming language. In this article, we move on to consider another type of UML diagram: the interaction diagram. Interaction diagrams depict a specific set of interactions between a set of objects. We are essentially looking to answer the question, "What does a method call look like in UML?"

We will be using a very simplistic and partially complete sales and tracking system to illustrate sequence and collaboration diagrams. The system consists of six Java classes with...

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Samples Index | Next Diagram >>

The sequence diagram in figure 1 represents an elaboration for the 'Student Registers for Class' use case in an automated student registration system. (Click here to see the diagram without the horizontal dotted guidelines.)

Figure 1 - Automated Registration System sample sequence diagram

The boxes at the top of the sequence diagram constitute the diagram header and represent the components or units of the system. Sequence diagram editor supports four types of header elements (see the full list of supported sequence diagram elements):

Actors - Actors represent a person or other external entity that interacts with the system. Objects - Objects are used to represent object instances in an object-oriented programming language such as Java or C++. Units - Units are used to represent logical entities in the system such as components, servers, threads and tasks that may or...
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Sequence diagrams are a popular dynamic modeling solution. Dynamic modeling focuses on the the interactions occurring within the system. Sequence diagrams specifically focus on the "lifelines" of an object and how they communicate with other objects to perform a function before the lifeline ends. Make your own sequence diagram using our UML diagram tool.

Follow the link to access a customizable sequence diagram template. You can add shapes, swap out text, change colors, and much more.

What is a Sequence Diagram

To understand what a sequence diagram is, it's important to know the role of UML. UML, or the Unified Modeling Language, is a modeling toolkit that guides the creation and notation of many types of diagrams, including behavior diagrams, interaction diagrams, and structure diagrams. Sequence diagrams are a kind of interaction diagram, because they describe how—and in what order—a group of objects works together. These diagrams are used by software...

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Table of content

Introduction on Bitcoin The entrepreneur perspectiveThe economist perspectiveThe whistleblower perspectiveThe dark perspectiveShow me the code Getting startedBitcoin address Protecting privacyIdentity verificationUnder the hoodShared ownershipConclusion

Introduction on Bitcoin

Codeproject fellows, I am glad to release the first article of a serie. [NEW : Part 2 Here]
I recently ported a good part of bitcoin source code from C++ to C#. I imported almost all unit tests. NBitcoin have approximately 70 tests you can use to play and discover.
This is a great learning experience that I will share with you. But Bitcoin all the technical aspects of bitcoin are too long to explain in only one article.
I will start this intro by looking Bitcoin from different perspectives, talking what led to its birth, and then showing you the code. For the first part I will cover only the offline aspect of bitcoin. In other words, I will omit all...

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Projects and procedures to build Bitcoin Core with MS Visual Studio

1.0 - 7/2/15 - initial release for Bitcoin Core 0.10.2 with Visual Studio 2013
1.1 - 11/6/15 - support for Bitcoin Core 0.11.1 with Visual Studio 2013 (includes OpenSSL 1.0.2d) 1.2 - 11/7/15 - support miniupnpc-1.9.20151026 (fixes buffer overrun vulnerability) 1.3 - 3/5/16 - support for Bitcoin Classic 0.11.2 with Visual Studio 2013

Current Versions Bitcoin

bitcoin bitcoinclassic-0.11.2.cl1 External berkeleydb db_4.8.30.NC boost boost_1.56.0 miniupnpc miniupnpc_1.9 (2015.1026) openssl openssl_1.0.2d protobuf protobuf-2.6.1 qrencode qrencode-3.4.4 qt qt-everywhere-opensource-src-5.4.2 zlib zlib_1.2.8

There are three parts to this readme. The first part is a rant. Please feel free to skip :) The second part is a cookbook for building Bitcoin Core with Microsoft Visual Studio. This Git repository includes the project files you'll need to do this. The third part talks about initializing the...

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What is opt-in RBF?

Opt-in Replace-by-Fee (RBF) allows transactions to be flagged as replaceable until they are confirmed in a block.

Is it a new feature?

Transaction replacement was introduced by Satoshi in the first release of the Bitcoin software, but later removed due to denial-of-service problems. Opt-in RBF solves this issue by requiring transaction replacements to pay a higher fee.

What is it used for?

During the period when transactions are waiting to be confirmed, some wallets would like to be able to update those transactions in order to increase their fee (which may help them get confirmed faster), compress multiple transactions into one, create background coinjoins (to improve privacy), or to perform a number of other useful actions.

How does it work?

Opt-in RBF is a change to memory pool and network relay code that allows those wallets to optionally add a signal to their transactions which tells full nodes that those...

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Why can't I activate my license in Eclipse?

When license activation fails in the 'Add License' dialog, then please follow these steps:

New licenses are in online mode and you must paste only the license identifier into the 'Add License' dialog. Do not paste the entire encrypted license when the license is in online mode. License activation uses the URL If you access that URL from your browser, you should get an HTTP Status 400 response. Anything else indicates a firewall or proxy issue. If the connection issue is caused by a local proxy, you may be able to fix the problem with the correct configuration in Eclipse at 'Window > Preferences > General > Network Connections'. If nothing else helps, you can switch your license to offline mode on your ObjectAid account: Please click on the license you want to update. On the 'License' page, switch the License Mode to Offline, enter the 'Offline...
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Sequence Diagrams
A sequence diagram is a form of interaction diagram which shows objects as lifelines running down the page, with their interactions over time represented as messages drawn as arrows from the source lifeline to the target lifeline. Sequence diagrams are good at showing which objects communicate with which other objects; and what messages trigger those communications. Sequence diagrams are not intended for showing complex procedural logic.

A lifeline represents an individual participant in a sequence diagram. A lifeline will usually have a rectangle containing its object name. If its name is "self", that indicates that the lifeline represents the classifier which owns the sequence diagram.

Sometimes a sequence diagram will have a lifeline with an actor element symbol at its head. This will usually be the case if the sequence diagram is owned by a use case. Boundary,...

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The following checklist shows the necessary steps for constructing a sequence diagram per mutation event from the use cases. Subsequently, we will explain the individual steps further:

Checklist 4.10 Constructing Sequence Diagrams in the Interaction View

Identify involved classes—What is affected by mutation events? Determine initial object—Where does the mutation event go first? Propagate events—How is the mutation event forwarded? Specify event parameter—What do objects have to know? Verify the sequence diagram—Is everything correct?

Identify Involved Classes—What is Affected by Mutation Events?

The classes that a mutation event affects have to be identified. This occurs on the basis of statechart diagrams (see The Behavioral View). The questions are:

Which classes are already affected by a certain mutation event? To answer this question you will have to look up which statechart diagrams contain the mutation event. If the mutation...
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