RPOW2
A modern tribute

RPOW2

Recreating Hal Finney's first digital currency — one of Bitcoin's most important predecessors.

Before Bitcoin

Four years before Bitcoin, there was RPOW.

In 2004, Hal Finney introduced Reusable Proofs of Work — the first practical digital monetary system built around proof-of-work.

Bitcoin solved decentralization.
RPOW proved something first:

that proof-of-work could represent scarce digital value.

Who was Hal Finney?

One of the greatest cryptographers and cypherpunks of his generation.

An early contributor to PGP, a pioneer of digital cash, and one of Bitcoin's earliest collaborators.

January 12, 2009
#1

Hal received the very first bitcoin transaction ever sent by Satoshi Nakamoto.

How RPOW worked

Unlike Bitcoin, the original RPOW was centralized.

A trusted server running on an IBM 4758 Secure Cryptographic Coprocessor verified transfers and prevented double-spending. Users trusted secure hardware instead of thousands of independent nodes.

What it did not have
No blockchain
No decentralized consensus
No mining difficulty adjustment
Why build RPOW2?

Twenty-two years later, one question:

Would Hal's original idea still stand today?

A working, modern tribute to the idea that started it all.

RPOW2 rebuilds Finney's system — honoring the cryptography, the ambition, and the man who received bitcoin's first transaction.

RPOW2

Before the blockchain, there was the proof. This is where it began.

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