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+---
+layout: fr
+title: Offline Signing Library for XmrSigner to Production
+author: Thor a.k.a. vThor a.k.a DiosDelRayo
+amount: 97
+milestones:
+  - name: Material
+    funds: 1 XMR
+    done:
+    status: unfinished
+  - name: First month
+    funds: 48 XMR
+    done:
+    status: unfinished
+  - name: Second month
+    funds: 48 XMR
+    done:
+    status: unfinished
+payouts:
+  - date:
+    amount:
+  - date:
+    amount:
+  - date:
+    amount:
+---
+
+# Offline Signing Library for XmrSigner Production
+
+## About
+
+This proposal aims to create a minimal library for offline signing on
+air-gapped devices, focusing on essential features:
+
+- Seed phrase generation (including polyseed)
+- Address and key generation
+- Account and sub-address management
+- Address verification
+- Output importing and Key Image exporting (raw and encrypted)*
+- Unsigned transaction handling (description, sanity checks, signing)
+- Block height and date estimation
+
+The library will be implemented in C++ with a C ABI, allowing use in
+multiple languages. It will be based on the current Monero source but
+without relying on wallet2, aiming for minimal external dependencies,
+not inventing the wheel again, nor rolling own crypto.
+
+Key objectives:
+- Comprehensive documentation
+- Quick start guide for offline and hardware wallet developers
+- Documentation of challenges in stripping down and cross-compiling
+- Buildroot package for easy target system integration
+- Python module for library usage
+- Test code
+- Modification of XmrSigner to use this new library
+
+## Who
+
+Thor (vThor/DiosDelRayo), currently completing the [XmrSigner (MoneroSigner Resurrection) proposal](https://ccs.getmonero.org/proposals/%20MoneroSignerResurrection.html).
+
+## Why
+
+[XmrSigner](https://github.com/XmrSigner/xmrsigner), while functional, is currently more of a proof of concept than a
+production-ready tool. This library addresses several key issues:
+
+1. Performance: The current implementation using wallet RPC is slow,
+especially on resource-constrained devices.
+2. Security: Minimizing dependencies and code base improves auditability
+and reduces attack surface.
+3. Flexibility: A dedicated library allows for easier integration into
+various offline signing solutions.
+4. Resource efficiency: Stripping down to essential features enables use on
+lower-power devices.
+
+By creating this library, we can:
+- Bring XmrSigner to production readiness
+- Provide a foundation for future hardware wallet development
+- Explore the viability of using even more resource-constrained devices
+(e.g., MCUs) for offline signing
+
+A proof of concept has been developed to validate this approach:
+[c_abi_for_cpp_code_PoC](https://github.com/DiosDelRayo/c_abi_for_cpp_code_PoC)
+
+This library will significantly improve XmrSigner's performance, security,
+and usability while opening doors for more diverse Monero hardware wallet
+solutions in the future.
+
+## Milestones and Timeline
+
+Given the significant time investment and potential challenges ahead, I
+propose a shift from my usual value-based pricing to an hourly rate for
+this project. 
+
+Proposed terms:
+- 120 hours per month for two months (240 hours total)
+- Compensation: 48 XMR per month (96 XMR total)
+- Additional 1 XMR for printed literature (requested at project start)
+- Total compensation: 97 XMR
+
+Hours worked beyond 120 in the first month will roll over to the second. If
+the project completes before 240 hours, unused funds can be allocated to
+future proposals or returned to the general fund. Should more time be
+needed, I'll submit a new proposal.
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