Script Templates

Script templates play a critical role in facilitating the creation and management of scripts that control the locking and unlocking of UTXOs (transaction outputs or tokens in BSV). These scripts are integral to implementing the various transaction protocols on the blockchain, adhering to Bitcoin's original vision while enhancing security, scalability, and efficiency.

The Role of Scripts in BSV

Scripts are pieces of code that define the conditions under which funds can be spent on the blockchain. Every transaction on the BSV network includes two kinds of scripts:

  • Locking Scripts: These scripts set conditions under which coins can be spent. They are included in the output of a transaction.

  • Unlocking Scripts: These scripts satisfy the conditions set by the locking scripts to spend the funds in a subsequent transaction. They are found in the input of a transaction.

The purpose of these scripts is to ensure that only authorized parties can access and transact the funds by meeting predefined conditions, which may include providing a digital signature or solving a computational challenge. Any conceivable set of constraints can be programmed into a locking script.

Concept of Script Templates

A script template is a predefined framework that simplifies the process of creating otherwise-potentially-complex locking and unlocking scripts. It abstracts away the underlying script construction details, allowing developers to create scripts without having to write low-level code for every new scenario. The template provides methods and properties to generate scripts dynamically based on the transaction context and the specific input parameters provided.

Components of a Script Template

A script template generally includes the following:

  1. Lock Method: This method generates a locking script based on given parameters, such as a public key hash or other conditions defined by the transaction type (e.g., P2PKH—Pay to Public Key Hash).

  2. Unlock Method: This method creates an unlocking script, which usually involves generating a digital signature and potentially other data required to unlock the funds according to the locking script's conditions.

  3. Estimate Length: This utility provides an estimation of the unlocking script's length, which can be crucial for transaction fee calculation.

Importance of Script Templates

Simplification and Standardization

Script templates standardize the creation of scripts, ensuring consistency and reducing errors in script generation. They provide a high-level interface for commonly used script patterns, like P2PKH, reducing the need for repetitive, error-prone coding.

Security Enhancements

By abstracting the details of script creation, script templates help in minimizing security risks associated with manual script handling. Robust templates can ensure that scripts are generated in a secure manner, adhering to the necessary cryptographic standards and best practices. Templates can also be audited for increased security, which will benefit everyone who relies upon it.

Scalability and Efficiency

Script templates enable developers to quickly implement and deploy blockchain solutions on a large scale. They reduce the complexity involved in script creation, allowing developers to focus on building applications rather than dealing with the intricacies of script coding.


Templates are designed to be flexible and extensible, accommodating various transaction types and conditions without significant modifications to the underlying codebase. This flexibility is crucial for adapting to evolving use cases and requirements in the BSV ecosystem.


Script templates are fundamental tools within the BSV SDK that streamline the development of on-chain use-cases by providing robust, secure, and efficient methods for handling transaction scripts. They encapsulate the complexity of script creation and ensure that developers can focus on higher-level application logic, thereby accelerating the development process and enhancing the capabilities of their implementations. To get started with script templates in the TypeScript SDK, check out this tutorial!

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