schedule a recurring post to advertise on nostr, no nsec is stored, only signed events

Advertize

Android app that pre-generates and schedules Nostr ad posts. Enter your nsec once, generate a batch of signed events, and the app posts them on schedule with no further interaction.

No key storage. The nsec is used only during batch generation, then wiped with 16-64 random cycles of SHA-256 overwrite.

Features

QR scan the nsec instead of typing it
Pre-generates 7 days of signed Nostr events (kind 1) with chained commitment tags
Randomized posting schedule ~8h intervals with +/-2h jitter
Smart relay discovery: fetches your follow list (kind 3), then their relay lists (kind 10002), picks the top 16 most common relays, refreshes 5 minutes before each post
Live countdown notification shows time to next post, persists in status bar while ads are pending
Auto-resumes on app launch or device reboot if pending ads exist
Low-battery alert notifies you a day before ads run out
BIP340 Schnorr signing via Go native library, compiled for all Android ABIs

APK Download

https://git.smesh.lol/advertize-releases/raw/branch/main/advertize-v1.0.0.apk

Screenshots

Generate	Status
nsec input + QR scan	pending queue
ad content editor	next post countdown
days selector	posted history

Build from source

Requirements:

Go 1.25+
Android SDK 36 + NDK
gomobile

git clone https://git.smesh.lol/advertize.git
cd advertize

# Build native crypto library
cd crypto
gomobile bind -target=android -androidapi 26 -o ../app/libs/crypto.aar .
cd ..

# Build APK
echo "sdk.dir=$ANDROID_HOME" > local.properties
./gradlew assembleDebug

# Install
adb install app/build/outputs/apk/debug/app-debug.apk

Architecture

Kotlin/Compose UI
    |
    v
PostingService (foreground, AlarmManager-scheduled)
    |
    +-- RelayDiscovery (kind 3 -> kind 10002 -> top 16)
    +-- RelayPool (OkHttp WebSocket publisher)
    +-- BatchGenerator (pre-sign events in Room DB)
    +-- crypto.aar (Go gomobile: BIP340 Schnorr, secp256k1)

Crypto is a thin Go module over git.mleku.dev/mleku/nostr compiled to native code via gomobile. No JNI hand-writing. All 4 Android ABIs bundled (arm64-v8a, armeabi-v7a, x86, x86_64).

Permissions

Internet: relay communication
Camera: QR code scanning (nsec input only, on-demand)
Foreground service: persistent notification while posting, auto-starts on boot if pending
Exact alarms: scheduled post wakeups
Notifications: posting status and low-battery alerts

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