> For the complete documentation index, see [llms.txt](https://hub.bsvblockchain.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hub.bsvblockchain.org/higher-learning/bsv-academy/bsv-opcodes/op_nop-op_ver.md). # Op\_NOP, OP\_Ver **Chronicle Release Update:** This chapter covers OP\_NOP, OP\_VERIFY, and their derivatives—all remain fully functional in Chronicle release with full backward compatibility. The Chronicle release has also restored version-related opcodes (OP\_VER, OP\_VERIF, OP\_VERNOTIF) which are discussed at the end of this chapter. Bitcoin Script needs mechanisms to control execution flow and validate conditions. While OP\_IF provides branching logic, other opcodes offer different control patterns. **OP\_NOP** and **OP\_VERIFY**, along with their derivatives, provide essential tools for script validation and execution control that appear in virtually every production Bitcoin Script. #### You will explore: * How OP\_NOP provides placeholder functionality for script padding * How OP\_VERIFY creates validation checkpoints that fail scripts on false conditions * The efficiency benefits of VERIFY derivatives * Practical patterns for multi-step validation * Restored version-related opcodes and their status #### By the end of this chapter, learners will: * **Understand** the purpose and operation of OP\_NOP and OP\_VERIFY * **Apply** VERIFY derivatives to create efficient validation scripts * **Implement** multi-step verification chains * **Recognize** when to use each VERIFY derivative * **Design** validation patterns that fail fast --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://hub.bsvblockchain.org/higher-learning/bsv-academy/bsv-opcodes/op_nop-op_ver.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.