Henceforth

Bitcoin Script's stack model came from FORTH. Henceforth lets you write in the language Script was modelled on — then sign and broadcast.

Bitcoin you can script.

Henceforth is a Bitcoin SV wallet wrapped around a complete FORTH terminal. Send, receive, and broadcast real Bitcoin transactions from a programmable command line. Define your own words, build raw transactions byte by byte, and visualise data with code you write yourself.

There's nothing else like it on the App Store.

YOUR KEYS, YOUR COINS

Private keys live in the iOS Keychain — never on a server. Every send is gated by Face ID or Touch ID. Transactions are permanent on the BSV blockchain, and fees are typically a fraction of a cent.

For extra safety, Cold Mode signs transactions on a second offline iPhone over AirDrop — a real air-gap setup without dedicated hardware.

A TERMINAL THAT DOES MORE THAN PRINT HELLO WORLD

Full Forth-2012 CORE compliance (133 standard words) plus 200+ Bitcoin Script and BSV protocol extensions.

Print a string: ." Hello, World"

Define a word and run it: : square dup * ; 5 square .

Pay someone from the command line: 1000 s" 1Q88RPbg..." send

The terminal isn't a toy shell — it's the same Forth interpreter that builds the transactions you broadcast.

WRITE, SAVE, AND RUN YOUR OWN PROGRAMS

Save reusable code as .fs files. The built-in editor and file manager lets you write, version, and rerun scripts. The classic FORTH way: small composable words growing into your own personal vocabulary.

CHARTS FROM THE STACK

Bar, line, and pie charts from any values on the stack. Visualise sequences, payment histories, or whatever data you compute — directly from FORTH code.

WHAT'S INSIDE

• BSV wallet with multi-recipient sends and raw transaction builder • Privacy-aware UTXO selection — fresh change addresses every send • 1Sat Ordinal awareness — protects your inscriptions from accidental spending • SPV transaction verification — trust math, not servers • Universal app — iPhone, iPad, and Mac • Local-first — works offline; on-chain when you broadcast • Forever yours — one-time purchase, no subscriptions, no ads

Powered by FORTH, the stack-based language Chuck Moore created in 1970.