Rattlegram

about

description

*Rattlegram* lets you transmit short text messages over COFDMTV encoded audio signals. COFDMTV is based on COFDM (coded orthogonal frequency-division multiplexing) technology: - 160 ms long OFDM symbols - 6.25 Hz per sub-carrier - 1/8 guard interval - differentially encoded PSK (phase-shift keying) modulation - systematic polar codes for forward error correction Currently Modes 14, 15 and 16 are supported: Using either SPC(2048, 1392), SPC(2048, 1056) or SPC(2048, 712) with CRC32C aided SCL decoding and differential QPSK modulation for the payload. Only a bandwidth of 1600 Hz is needed and the transmission of either 85, 128 or 170 bytes take about one second with the leading noise and fancy header disabled.

publisher

78ce6faa72264387284e647ba6938995735ec8c7d5c5a65737e55130f026307d

first seen

2026-09-17T22:35:54.062918+00:00

last event

2026-10-08 17:27 UTC

install

zapstore.dev or any Zapstore-compatible client

source & build

repository

https://github.com/aicodix/rattlegram

arch flags

android-arm64-v8a android-armeabi-v7a android-x86 android-x86_64

manifest

missing

releases (kind 30063)

1 release indexed; latest 1.19.

assets & verification

Every app, release and asset event is schnorr-verified (NIP-01 id + signature) before it enters the catalog, and assets are content-addressed by sha256. We subscribe read-only to the catalog relay — never write to it.

1.19 — app-release.apk

sha256

3098114e035aec1df480f6fc2220a415cfee50f604f17c4374cb4b46d2fe9928

size

7.4 MB

archs

android-arm64-v8a, android-armeabi-v7a, android-x86, android-x86_64

version code

20

apk cert sha256

b68ff5248273a1d8616c64f6b96c189a062a1f6e2e2966aac71e9d1918a2ed74

download

app-release.apk

Showing the newest 1 asset descriptor; the full set is in /api/apps/78ce6faa…