btclib-wallet

Projects that follow the best practices below can voluntarily self-certify and show that they've achieved an Open Source Security Foundation (OpenSSF) best practices badge.

There is no set of practices that can guarantee that software will never have defects or vulnerabilities; even formal methods can fail if the specifications or assumptions are wrong. Nor is there any set of practices that can guarantee that a project will sustain a healthy and well-functioning development community. However, following best practices can help improve the results of projects. For example, some practices enable multi-person review before release, which can both help find otherwise hard-to-find technical vulnerabilities and help build trust and a desire for repeated interaction among developers from different companies. To earn a badge, all MUST and MUST NOT criteria must be met, all SHOULD criteria must be met OR be unmet with justification, and all SUGGESTED criteria must be met OR unmet (we want them considered at least). If you want to enter justification text as a generic comment, instead of being a rationale that the situation is acceptable, start the text block with '//' followed by a space. Feedback is welcome via the GitHub site as issues or pull requests There is also a mailing list for general discussion.

We gladly provide the information in several locales, however, if there is any conflict or inconsistency between the translations, the English version is the authoritative version.
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These are the Gold level criteria. You can also view the Passing or Silver level criteria.

Baseline Series: Baseline Level 1 Baseline Level 2 Baseline Level 3

        

 Basics 3/5 ●

  • General

    Note that other projects may use the same name.

    Bitcoin wallet functionality built on btclib

    Please use SPDX license expression format; examples include "Apache-2.0", "BSD-2-Clause", "BSD-3-Clause", "GPL-2.0+", "LGPL-3.0+", "MIT", and "(BSD-2-Clause OR Ruby)". Do not include single quotes or double quotes.
    If there is more than one language, list them as comma-separated values (spaces optional) and sort them from most to least used. If there is a long list, please list at least the first three most common ones. If there is no language (e.g., this is a documentation-only or test-only project), use the single character "-". Please use a conventional capitalization for each language, e.g., "JavaScript".
    The Common Platform Enumeration (CPE) is a structured naming scheme for information technology systems, software, and packages. It is used in a number of systems and databases when reporting vulnerabilities.

  • Prerequisites


    Enough for a badge!

    The project MUST achieve a silver level badge. [achieve_silver]

  • Project oversight


    Not enough for a badge.

    The project MUST have a "bus factor" of 2 or more. (URL required) [bus_factor]
    A "bus factor" (aka "truck factor") is the minimum number of project members that have to suddenly disappear from a project ("hit by a bus") before the project stalls due to lack of knowledgeable or competent personnel. The truck-factor tool can estimate this for projects on GitHub. For more information, see Assessing the Bus Factor of Git Repositories by Cosentino et al.

    fametrano wrote almost all of the code and is the only person who knows it in depth. The claude account in the contributors graph comes from the Co-Authored-By trailer on AI-assisted commits, most of them fametrano's. pmazzocchi, an organization owner, did the 2026-09-30 security review and, in October 2026, contributed changes to descriptor and PSBT parsing, the fetch backends and the tests that replay upstream vectors and corpora. mayankdhingra02 opened 17 merged pull requests in October 2026, most of their lines under tests/, on BIP322, PSBT and descriptors (counted with gh pr list -R btclib-org/btclib-wallet -s merged -A mayankdhingra02 -L 500 -S 'merged:2026-10-01..2026-10-31' --json number -q length). Other outside contributors have made only small changes. giacomocaironi, also an organization owner, has made no commit to this repository. The organization owners administer every repository. Knowledge of the code rests on fametrano alone. https://github.com/btclib-org/.github/blob/main/GOVERNANCE.md#continuity https://github.com/btclib-org/btclib-wallet/graphs/contributors


    Not enough for a badge.

    The project MUST have at least two unassociated significant contributors. (URL required) [contributors_unassociated]
    Contributors are associated if they are paid to work by the same organization (as an employee or contractor) and the organization stands to benefit from the project's results. Financial grants do not count as being from the same organization if they pass through other organizations (e.g., science grants paid to different organizations from a common government or NGO source do not cause contributors to be associated). Someone is a significant contributor if they have made non-trivial contributions to the project in the past year. Examples of good indicators of a significant contributor are: written at least 1,000 lines of code, contributed 50 commits, or contributed at least 20 pages of documentation.

    The significant contributors are fametrano, pmazzocchi and mayankdhingra02. pmazzocchi and fametrano are associated: both are CheckSig co-founders, as their GitHub profiles state. mayankdhingra02 opened 17 merged pull requests in October 2026, about 500 lines under src/ and 4,000 under tests/, on BIP322, PSBT and descriptors. Whether he is unassociated is not established. Other outside contributors have made only small changes. giacomocaironi, also an organization owner, has made no commit to this repository. https://github.com/fametrano https://github.com/pmazzocchi https://github.com/mayankdhingra02


  • Other


    Enough for a badge!

    The project MUST include a license statement in each source file. This MAY be done by including the following inside a comment near the beginning of each file: SPDX-License-Identifier: [SPDX license expression for project]. [license_per_file]
    This MAY also be done by including a statement in natural language identifying the license. The project MAY also include a stable URL pointing to the license text, or the full license text. Note that the criterion license_location requires the project license be in a standard location. See this SPDX tutorial for more information about SPDX license expressions. Note the relationship with copyright_per_file, whose content would typically precede the license information.

    Every .py file states "Distributed under the MIT software license, see the accompanying LICENSE file or https://opensource.org/license/mit", e.g. https://github.com/btclib-org/btclib-wallet/blob/main/src/btclib_wallet/__init__.py


 Change Control 4/4 ●

  • Public version-controlled source repository


    Enough for a badge!

    The project's source repository MUST use a common distributed version control software (e.g., git or mercurial). [repo_distributed]
    Git is not specifically required and projects can use centralized version control software (such as subversion) with justification.

    Repository on GitHub, which uses git. git is distributed.


    Enough for a badge!

    The project MUST clearly identify small tasks that can be performed by new or casual contributors. (URL required) [small_tasks]
    This identification is typically done by marking selected issues in an issue tracker with one or more tags the project uses for the purpose, e.g., up-for-grabs, first-timers-only, "Small fix", microtask, or IdealFirstBug. These new tasks need not involve adding functionality; they can be improving documentation, adding test cases, or anything else that aids the project and helps the contributor understand more about the project.

    Small tasks for newcomers carry the label "good first issue", which CONTRIBUTING.md sets aside for a first contribution. https://github.com/btclib-org/btclib-wallet/blob/main/CONTRIBUTING.md#the-issue-tracker https://github.com/btclib-org/btclib-wallet/issues?q=label%3A%22good+first+issue%22


    Enough for a badge!

    The project MUST require two-factor authentication (2FA) for developers for changing a central repository or accessing sensitive data (such as private vulnerability reports). This 2FA mechanism MAY use mechanisms without cryptographic mechanisms such as SMS, though that is not recommended. [require_2FA]

    The btclib-org GitHub organization requires two-factor authentication of every member (organization setting two_factor_requirement_enabled = true), so nobody without 2FA can change a repository. https://github.com/btclib-org


    Enough for a badge!

    The project's two-factor authentication (2FA) SHOULD use cryptographic mechanisms to prevent impersonation. Short Message Service (SMS) based 2FA, by itself, does NOT meet this criterion, since it is not encrypted. [secure_2FA]
    A 2FA mechanism that meets this criterion would be a Time-based One-Time Password (TOTP) application that automatically generates an authentication code that changes after a certain period of time. Note that GitHub supports TOTP.

    The btclib-org GitHub organization requires two-factor authentication of every member and has 'Only allow secure two-factor methods' selected, which refuses SMS as a second factor: only TOTP apps, security keys/passkeys and GitHub Mobile are accepted. On 2026-11-12, gh api orgs/btclib-org answers two_factor_requirement_enabled true and has no field for the secure-methods setting, which was read from the organization's security settings on 2026-09-30 and recorded at https://github.com/btclib-org/.github/issues/1362#issuecomment-5903994882


 Quality 6/7 ●

  • Coding standards


    Enough for a badge!

    The project MUST document its code review requirements, including how code review is conducted, what must be checked, and what is required to be acceptable. (URL required) [code_review_standards]
    See also two_person_review and contribution_requirements.

    REVIEWING.md states what a review checks, how a finding is written and what clears a pull request; the part shared by every repository is followed by what this tree checks in particular. https://github.com/btclib-org/btclib-wallet/blob/main/REVIEWING.md


    Not enough for a badge.

    The project MUST have at least 50% of all proposed modifications reviewed before release by a person other than the author, to determine if it is a worthwhile modification and free of known issues which would argue against its inclusion [two_person_review]

    Over the last two releases, v2026.11.11 and v2026.11.12, 5 of 46 pull requests were approved by somebody other than the author, 11%, below the 50% the criterion asks (v2026.11.12 4 of 22, v2026.11.11 1 of 24); 0 were approved by somebody other than fametrano. Counted by merge time between release publications, over the same two-release window on every btclib-org project, with gh pr list -R btclib-org/btclib-wallet -s merged -L 500 -S 'merged:2026-11-11T12:36:22Z..2026-11-12T05:25:49Z' --json author,reviews -q '[.[] | .author.login as $a | select(any(.reviews[]; .state == "APPROVED" and .author.login != $a))] | length', which prints 4, and the same with 'merged:2026-11-07T03:02:56Z..2026-11-11T12:36:21Z', which prints 1. With -q length in place of the query, the two print 22 and 24. Adding and .author.login != "fametrano" inside any() makes both print 0. main's ruleset requires one approving review from somebody other than the author, and fametrano holds a pull_request-mode bypass of it. https://github.com/btclib-org/.github/issues/2021


  • Working build system


    Enough for a badge!

    The project MUST have a reproducible build. If no building occurs (e.g., scripting languages where the source code is used directly instead of being compiled), select "not applicable" (N/A). (URL required) [build_reproducible]
    A reproducible build means that multiple parties can independently redo the process of generating information from source files and get exactly the same bit-for-bit result. In some cases, this can be resolved by forcing some sort order. JavaScript developers may consider using npm shrinkwrap and webpack OccurrenceOrderPlugin. GCC and clang users may find the -frandom-seed option useful. The build environment (including the toolset) can often be defined for external parties by specifying the cryptographic hash of a specific container or virtual machine that they can use for rebuilding. The reproducible builds project has documentation on how to do this.

    The sdist is built with SOURCE_DATE_EPOCH from the commit. Every week sdist-rebuild.yml rebuilds the latest release's sdist from its signed tag and verifies it against the release's build attestation, and RELEASING.md gives the same check to anyone. https://github.com/btclib-org/btclib-wallet/blob/main/.github/workflows/sdist-rebuild.yml


  • Automated test suite


    Enough for a badge!

    A test suite MUST be invocable in a standard way for that language. (URL required) [test_invocation]
    For example, "make check", "mvn test", or "rake test" (Ruby).

    https://github.com/btclib-org/btclib-wallet?tab=contributing-ov-file


    Enough for a badge!

    The project MUST implement continuous integration, where new or changed code is frequently integrated into a central code repository and automated tests are run on the result. (URL required) [test_continuous_integration]
    In most cases this means that each developer who works full-time on the project integrates at least daily.

    test.yml runs the suite on every pull request and push to main that changes more than prose, as automated_integration_testing says, and its aggregate check is required on main. https://github.com/btclib-org/btclib-wallet/blob/main/.github/workflows/test.yml


    Enough for a badge!

    The project MUST have FLOSS automated test suite(s) that provide at least 90% statement coverage if there is at least one FLOSS tool that can measure this criterion in the selected language. [test_statement_coverage90]

    pyproject.toml sets fail_under = 100.0 in [tool.coverage.report], and the coverage job gates every pull request that changes more than prose, as automated_integration_testing says. https://github.com/btclib-org/btclib-wallet/blob/main/pyproject.toml


    Enough for a badge!

    The project MUST have FLOSS automated test suite(s) that provide at least 80% branch coverage if there is at least one FLOSS tool that can measure this criterion in the selected language. [test_branch_coverage80]

    pyproject.toml sets branch = true in [tool.coverage.run], and the 100% gate includes branch coverage. https://github.com/btclib-org/btclib-wallet/blob/main/pyproject.toml


 Security 4/5 ●

  • Use basic good cryptographic practices

    Note that some software does not need to use cryptographic mechanisms. If your project produces software that (1) includes, activates, or enables encryption functionality, and (2) might be released from the United States (US) to outside the US or to a non-US-citizen, you may be legally required to take a few extra steps. Typically this just involves sending an email. For more information, see the encryption section of Understanding Open Source Technology & US Export Controls.

    Not enough for a badge.

    The software produced by the project MUST support secure protocols for all of its network communications, such as SSHv2 or later, TLS1.2 or later (HTTPS), IPsec, SFTP, and SNMPv3. Insecure protocols such as FTP, HTTP, telnet, SSLv3 or earlier, and SSHv1 MUST be disabled by default, and only enabled if the user specifically configures it. If the software produced by the project does not support network communications, select "not applicable" (N/A). [crypto_used_network]

    Not every network communication has a secure protocol. CompactFilterFetcher talks to a peer over plain TCP, the p2p v1 transport, and no encrypted transport is offered for it; its transport has no default, so the caller chooses it, and its messages are checked against what the fetcher holds. Elsewhere traffic goes in the clear only where the caller chooses it. TlsLineTransport, the Electrum transport, verifies the server certificate and host name with a TLS 1.2 floor, and offers no plain TCP. The Esplora backend has no default server. The BLOCKSTREAM_INFO constant it offers holds https urls. The Core backends use the caller's bitcoin-core-rpc client, which verifies HTTPS and speaks plain HTTP only for an http url. https://github.com/btclib-org/btclib-wallet/blob/main/src/btclib_wallet/fetch/peer_transport.py https://github.com/btclib-org/btclib-wallet/blob/main/src/btclib_wallet/fetch/transport.py https://github.com/btclib-org/btclib-wallet/blob/main/src/btclib_wallet/fetch/esplora.py


    Enough for a badge!

    The software produced by the project MUST, if it supports or uses TLS, support at least TLS version 1.2. Note that the predecessor of TLS was called SSL. If the software does not use TLS, select "not applicable" (N/A). [crypto_tls12]

    TlsLineTransport sets minimum_version to TLS 1.2 itself. The Esplora and Core backends use bitcoin-core-rpc's HTTPS. CompactFilterFetcher's p2p transport does not use TLS. https://github.com/btclib-org/btclib-wallet/blob/main/src/btclib_wallet/fetch/transport.py


  • Secured delivery against man-in-the-middle (MITM) attacks


    Enough for a badge!

    The project website, repository (if accessible via the web), and download site (if separate) MUST include key hardening headers with nonpermissive values. (URL required) [hardened_site]
    Note that GitHub and GitLab are known to meet this. Sites such as https://securityheaders.com/ can quickly check this. The key hardening headers are: Content Security Policy (CSP), HTTP Strict Transport Security (HSTS), X-Content-Type-Options (as "nosniff"), and X-Frame-Options. Fully static web sites with no ability to log in via the web pages could omit some hardening headers with less risk, but there's no reliable way to detect such sites, so we require these headers even if they are fully static sites.

    The project site is served over HTTPS and answers Content-Security-Policy with frame-ancestors 'none', X-Frame-Options: DENY, X-Content-Type-Options: nosniff and Strict-Transport-Security. Check with curl -sI https://btclib.org/btclib-wallet/ The repository on github.com sends all four. PyPI's project page https://pypi.org/project/btclib-wallet/ sends all but the CSP; that is PyPI's to set. The documentation site https://btclib-wallet.readthedocs.io/ is served by Read the Docs over HTTPS with Strict-Transport-Security and X-Content-Type-Options nosniff, and no Content-Security-Policy or X-Frame-Options; that is Read the Docs' to set. Measured with curl -sIL on 2026-11-12.


  • Other security issues


    Enough for a badge!

    The project MUST have performed a security review within the last 5 years. This review MUST consider the security requirements and security boundary. [security_review]
    This MAY be done by the project members and/or an independent evaluation. This evaluation MAY be supported by static and dynamic analysis tools, but there also must be human review to identify problems (particularly in design) that tools cannot detect.

    pmazzocchi, an owner other than the maintainer, reviewed the tree on 2026-09-30 against ASSURANCE_CASE.md, claim by claim. Issue 169 records the scope, the method, what was not covered and the findings, each filed as an issue. https://github.com/btclib-org/btclib-wallet/issues/169


    Enough for a badge!

    Hardening mechanisms MUST be used in the software produced by the project so that software defects are less likely to result in security vulnerabilities. (URL required) [hardening]
    Hardening mechanisms may include HTTP headers like Content Security Policy (CSP), compiler flags to mitigate attacks (such as -fstack-protector), or compiler flags to eliminate undefined behavior. For our purposes least privilege is not considered a hardening mechanism (least privilege is important, but separate).

    ruff's select = ["ALL"] includes the bandit S rules, so unsafe deserialization, weak temporary files and shell injection fail the lint gate. CodeQL also runs on every pull request. https://github.com/btclib-org/btclib-wallet/blob/main/.github/workflows/codeql.yml


 Analysis 2/2 ●

  • Dynamic code analysis


    Enough for a badge!

    The project MUST apply at least one dynamic analysis tool to any proposed major production release of the software produced by the project before its release. [dynamic_analysis]
    A dynamic analysis tool examines the software by executing it with specific inputs. For example, the project MAY use a fuzzing tool (e.g., American Fuzzy Lop) or a web application scanner (e.g., OWASP ZAP or w3af). In some cases the OSS-Fuzz project may be willing to apply fuzz testing to your project. For purposes of this criterion the dynamic analysis tool needs to vary the inputs in some way to look for various kinds of problems or be an automated test suite with at least 80% branch coverage. The Wikipedia page on dynamic analysis and the OWASP page on fuzzing identify some dynamic analysis tools. The analysis tool(s) MAY be focused on looking for security vulnerabilities, but this is not required.

    Every release runs the test suite before it is published. release.yml calls test.yml, and the PyPI upload runs only if it passes. The suite fails below 100% coverage, branches included. ClusterFuzzLite fuzzing and cosmic-ray mutation testing also run every week. https://github.com/btclib-org/btclib-wallet/blob/main/.github/workflows/release.yml https://github.com/btclib-org/btclib-wallet/blob/main/.github/workflows/fuzz.yml


    Enough for a badge!

    The project SHOULD include many run-time assertions in the software it produces and check those assertions during dynamic analysis. [dynamic_analysis_enable_assertions]
    This criterion does not suggest enabling assertions during production; that is entirely up to the project and its users to decide. This criterion's focus is instead to improve fault detection during dynamic analysis before deployment. Enabling assertions in production use is completely different from enabling assertions during dynamic analysis (such as testing). In some cases enabling assertions in production use is extremely unwise (especially in high-integrity components). There are many arguments against enabling assertions in production, e.g., libraries should not crash callers, their presence may cause rejection by app stores, and/or activating an assertion in production may expose private data such as private keys. Beware that in many Linux distributions NDEBUG is not defined, so C/C++ assert() will by default be enabled for production in those environments. It may be important to use a different assertion mechanism or defining NDEBUG for production in those environments.

    The tests, mutation runs and fuzz targets run Python without -O, so assertions are enabled.



You can use tools and AI systems to propose changes via a simple URL, such as https://www.bestpractices.dev/en/projects/14813/choose/edit?osps_ac_01_01_status=Met&osps_ac_01_01_justification=GitHub+enforced. See our automation proposals system for how to do that. This data is available under the Community Data License Agreement – Permissive, Version 2.0 (CDLA-Permissive-2.0). This means that a Data Recipient may share the Data, with or without modifications, so long as the Data Recipient makes available the text of this agreement with the shared Data. Please credit Ferdinando Ametrano and the OpenSSF Best Practices badge contributors.

Project badge entry owned by: Ferdinando Ametrano.
Entry created on 2026-09-24 15:04:06 UTC, last updated on 2026-11-12 15:28:40 UTC. Last achieved passing badge on 2026-09-24 17:43:53 UTC.