Exonumia Africa Launches Mantra, an Encrypted Tool for Bitcoin Translation Teams
Exonumia Africa has introduced Mantra, an end-to-end encrypted. And decentralized translation management tool. Designed for groups that publish Bitcoin literature in many languages.
The project announced the alpha on 9 September 2026 and pointed users to mantra.press. Exonumia said it built the software after years of coordinating open-source translations in more than 21 languages on exonumia.africa.
Mantra is not a conventional translation dashboard. It treats a translation team as a cryptographic group: members talk in private chats. Propose work in chunks, and publish only after a threshold of admins sign with a shared key that no single person holds.
Why Exonumia built its own tool?
Exonumia is a South African nonprofit that translates Bitcoin educational material into native African languages.
Founder Kgothatso Ngako started the project after noticing that most Bitcoin literature is in English. While many people who would benefit from it do not use English as a first language.
The organization has published or worked on material in languages including isiZulu, Kiswahili, Shona, Chewa, Arabic, Somali, Lingala, Kirundi, Luganda. And others, covering texts such as the Bitcoin white paper and later educational books. As the translator network grew, coordination became the bottleneck.
Exonumia said Mantra began as an internal tool. The team later concluded that most of the real workflow happens in conversation. So the product is built around encrypted group chat rather than a traditional project-management interface.
What Mantra does?
The public site describes Mantra as “a press a group holds in common.” It lists four functions:
- Speak: group conversation encrypted end to end. Relays carry ciphertext and cannot read it.
- Translate: a work is split into chapters and chunks. A group names the dialects it speaks and translates one chunk at a time.
- Sign: the group creates one signing key in a ceremony. Each member keeps a share. Nothing is published until enough shares sign.
- Hold: twelve words restore identity and wallet. Payments settle over Lightning to keys on the user’s device.
There is no company account to recover and no server that can read group messages. Identity is a key the user owns.
How the cryptography works?
Mantra’s chat layer uses end-to-end encryption through NIP-17, MLS (Messaging Layer Security). And the Marmot protocol. Messages are sealed on the sending device and opened only on intended devices. Relays store ciphertext only.
Group approval uses FROST (Flexible Round-Optimized Schnorr Threshold Signatures). FROST lets a group produce one valid Schnorr signature without any participant holding the full private key.
To check that the group key’s entropy is sound and not biased toward one member. Group creation experimentally runs ChillDKG over NIP-17. ChillDKG is a distributed key-generation protocol designed for FROST. After the ceremony, the temporary NIP-17 setup group can be retired.
Participants become admins of the new group, and the signing key becomes the group identifier. Exonumia says this will later hold even as admins are added or removed.
Subgroups for large translator communities
Community management was another unsolved problem. Mantra adds subgroups, each with its own FROST key. A parent group can issue a signed “birth certificate” to a subgroup.
That certificate can later prove that work approved by the subgroup came from a recognized child group, while keeping the parent group smaller and quieter.
The design is meant for language teams, chapter teams, or working parties that should operate on their own without flooding a main chat.
Infrastructure and source code
Mantra has no private backend of its own. Messages travel over interchangeable Nostr relays.
Users can send the same event to several relays so that one outage or refusal does not stop the group.
The project says it is built in the open. Source and protocol notes are published at code.sigidli.com/mantra/mantra-kmp. Target platforms listed on the site are Android, iOS, and desktop.
Alpha warning: not ready for production work
Exonumia was explicit about stability. This is an alpha release. The default relay currently drops messages every hour.
And any update can wipe the local database. The team told users who actually need the tool to wait for beta.
The website also states that sign-in is not open yet and that the product is still in alpha testing.
Why the launch matters?
Bitcoin education in Africa is still limited by language. English-language white papers, explainer essays. And books do not reach many first-language speakers of isiZulu, Kiswahili, Somali, Lingala, or Shona. Exonumia’s answer has been human translation by community contributors, not machine output alone.
Mantra tries to give those contributors the same properties Bitcoin itself emphasizes: no single custodian, verifiable signatures. And tools that work across borders.
If the beta holds up, similar groups outside Africa could use the same stack for any multilingual publishing project that needs private discussion plus public, checkable sign-off.
For now, the useful public artifacts are the announcement thread from @ExonumiaAfrica, the product site at mantra.press, the translation library at exonumia.africa. And the source repository.
Anyone testing the alpha should treat keys, drafts. And chat history as disposable until the beta lands.