On January 3, 2009, Satoshi Nakamoto mined the Bitcoin Genesis Block, embedding the now-famous headline from The Times: “Chancellor on brink of second bailout for banks.”

Nine days later, on January 12, 2009, something even more significant happened — at least from the perspective of proving Bitcoin actually worked.

Block 170 contained the first Bitcoin transaction between two distinct human beings: Satoshi Nakamoto sent 10 BTC to Hal Finney.

That transaction — a simple transfer of ten freshly minted coins — represents the moment Bitcoin transitioned from a clever cryptographic trick into a functioning peer-to-peer electronic cash system. It is, in many ways, the real birthday of Bitcoin as a usable technology.

I. The Recipient: Hal Finney, the Cryptographer Who Understood First

Hal Finney was not an ordinary early adopter. He was one of the most respected cryptographers of his generation — a co-developer of PGP (Pretty Good Privacy), the creator of the first anonymous remailer, and a cypherpunk who had been thinking about digital cash since the 1990s.

Finney had been active on the Cypherpunks mailing list alongside figures like Wei Dai (creator of b-money), Nick Szabo (creator of Bit Gold), and Adam Back (creator of Hashcash). When Satoshi published the Bitcoin whitepaper in October 2008, Finney was one of the few people in the world who had the cryptographic background to immediately grasp what was being proposed.

“I thought I was going to be one of the first people in the world to actually create digital cash — but Satoshi beat me to it. When I saw his whitepaper, I knew this was it.”

— Hal Finney (from his BitcoinTalk posts, 2009)

On January 10, 2009 — just seven days after the Genesis Block — Finney posted on BitcoinTalk that he had successfully compiled and run Bitcoin version 0.1 on his computer. He was the second person, after Satoshi, to operate a Bitcoin node.

Two days later, Satoshi sent him 10 BTC.

II. The Transaction: Block 170 in Detail

Block 170 was mined at approximately 22:28 UTC on January 12, 2009. The coinbase transaction created 50 fresh BTC — the standard block reward at the time — and then immediately sent 10 of those coins to Hal Finney’s address.

The receiving address — 1HUG5jQrYnZUHP8aJ7jXzN5oGhJ1z5gJcP — has never spent a single satoshi. The 10 BTC remain in place to this day, untouched for over 17 years.

At Bitcoin’s all-time high, those 10 coins were worth approximately $1,100,000. But their historical significance far exceeds their monetary value.

III. Why This Transaction Matters

The significance of Block 170 extends far beyond the relatively small amount transferred:

1. Proof of Two-Party Functionality. Before Block 170, all Bitcoin transactions were either coinbase outputs (mined coins sitting at the miner’s address) or hypothetical constructs in the whitepaper. Block 170 proved that one person could send coins to another — the entire premise of peer-to-peer electronic cash depended on this working correctly.

2. The Social Layer. Bitcoin is not just a technical protocol — it’s a social contract. The first transaction between Satoshi and Finney created the first social proof: two people, unknown to each other in physical space, transacting value across the internet without any trusted intermediary.

3. Timestamp Immutability. The coins in Block 170 are at the very bottom of Bitcoin’s on-chain archaeology. They were minted in the first week of Bitcoin’s existence. Every subsequent block, every transaction, every wallet address — all of it builds on top of the timestamp foundation laid by blocks 1 through 170.

4. A Cryptographic Handshake. Satoshi chose Finney deliberately. Sending the first Bitcoin to one of the world’s most respected cryptographers was a gesture of legitimacy — a signal that Bitcoin had been examined and validated by someone whose opinion mattered in the cryptographic community.

IV. The Coins That Never Moved

One of the most remarkable aspects of Block 170 is that the 10 BTC have never been spent. After 17+ years, they remain exactly where Satoshi placed them.

This creates a unique form of timestamp scarcity:

Hal Finney passed away on August 28, 2014, after a five-year battle with ALS. He was cryopreserved by the Alcor Life Extension Foundation. The private keys to his Bitcoin wallet — including the 10 BTC from Block 170 — were likely stored on his personal computer. Their fate remains unknown.

If the keys are held by Finney’s estate, they represent the single most historically significant Bitcoin UTXO in existence — the first coins ever transferred between two people, locked in a time capsule of cryptographic history.

If the keys were lost with Finney’s passing (as many believe), then those 10 BTC are permanently burned — removed from circulating supply forever. Either way, they will never move again.

V. Block 170 in the Context of 2009

To understand the significance of Block 170, it’s helpful to place it in the timeline of Bitcoin’s first month:

During this period, the entire Bitcoin network had a combined hashrate measured in single-digit MH/s — a modern ASIC miner could outcompute the entire 2009 network in milliseconds. The difficulty was 1, and a standard desktop CPU could mine blocks.

VI. The Archaeological Significance of Block 170

For the on-chain archaeologist, Block 170 represents something akin to a fossilized footprint — proof that Bitcoin was not just Satoshi’s solo experiment, but a system designed for actual human use.

The 10 BTC in Hal Finney’s address are the earliest known example of a complete peer-to-peer transaction:

• Sender: Pseudonymous creator (Satoshi)
• Recipient: Real-world cryptographer (Finney)
• Amount: Meaningful but not trivial (10 BTC)
• Outcome: Coins received and acknowledged
• Historical record: Documented on BitcoinTalk by both participants

This transaction is to cryptocurrency what the first telephone call (Alexander Graham Bell to Thomas Watson, March 10, 1876) or the first email (Ray Tomlinson to himself, 1971) is to communication technology. It marks the moment the abstraction became real.

VII. Conclusion: The Smallest Transaction with the Largest Meaning

Ten bitcoin. Less than a cup of coffee in 2026 terms when measured by face value. But the 10 BTC sent from Satoshi to Hal Finney on January 12, 2009, carry a historical weight that no amount of present-day bitcoin can match.

They are the first proof that Bitcoin works. They are the first timestamp-anchored social contract in the digital age. They are an artifact of a moment when two people — one pseudonymous, one very real — transacted across the internet without banks, without governments, without trust in anything but code.

And 17 years later, they still sit exactly where Satoshi put them. A digital fossil. An immutable timestamp. The first breath of a new financial system.

In a world where everything digital can be copied, the 10 BTC in Block 170 are utterly unique. Like a dinosaur footprint preserved in stone, they can be seen but never replicated — the moment value first traveled from one mind to another across the blockchain.

— Encryption Archive · coinage-history.com