From e1a010b779493d289c7971f38b0761b6d71a9622 Mon Sep 17 00:00:00 2001
From: Satoshi Qazi Muhammed <info@pezkuwichain.io>
Date: Fri, 17 Jul 2026 10:40:01 -0700
Subject: [PATCH] Fix: keep net.i2p.crypto.eddsa classes from being stripped by
 R8

Signer.kt/SignatureVerifier.kt in substrate-sdk-android look up the
"EdDSA" JCA provider by name at runtime (Signature.getInstance(...,
"EdDSA")), backed by net.i2p.crypto:eddsa's EdDSASecurityProvider. With
no keep rule, R8 stripped/renamed its classes in the minified release
build, so the provider's own registered service implementation could no
longer be found - "class configured for Signature (provider: EdDSA)
cannot be found", reproduced on-device sending SOL (every Solana
transaction signs with Ed25519, so this path is always hit).
---
 app/proguard-rules.pro | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index d0f00f24..cc79acc6 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -77,6 +77,16 @@
 -keep class org.bouncycastle.** { *; }
 -dontwarn org.bouncycastle.**
 
+# ============================================================
+# EdDSA (net.i2p.crypto:eddsa, pulled in transitively by substrate-sdk-android)
+# ============================================================
+# Signer.kt/SignatureVerifier.kt look up this JCA provider by name at runtime
+# (Signature.getInstance(..., "EdDSA")) - every Ed25519 signature (all Solana
+# transactions, and any Substrate account using CryptoType.ED25519) goes
+# through this provider, so its classes must survive obfuscation intact.
+-keep class net.i2p.crypto.eddsa.** { *; }
+-dontwarn net.i2p.crypto.eddsa.**
+
 # ============================================================
 # Native JNI Bindings (Rust)
 # ============================================================