Blocks 461,400 and nearby. April 2017. Coinbase: "/EB1/AD6/GREGS/BitClub Network/" In April 2017, BitClub Network was mining Bitcoin blocks and putting political slogans in the coinbase: FIGHT, GREGS, CORE. They were picking a side in the blocksize war. BitClub Network was indicted in 2019 for running a $722 million Ponzi scheme. The founders pleaded guilty. It was one of the largest crypto fraud cases in history. But in April 2017, they were mining real blocks, signaling on real debates, embedding their positions in the chain. "GREGS" is a reference to Gregory Maxwell, a Bitcoin Core developer and opponent of the large-block faction. FIGHT. CORE. They were announcing whose side they weren't on. The political messages are permanent. The company is gone. The victims lost hundreds of millions. The blocks they mined, including the ones with the slogans, are still part of the chain every node inherits. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 434,896. October 18, 2016. Coinbase: "/ViaBTC/hard fork/6..mm.../EB1/AD6/" Eight days earlier, ViaBTC mined a block that said "We Love Bitcoin!" That's still in the chain. Then they announced they would support a hard fork to increase the block size. Then they mined a block that said "hard fork." ViaBTC eventually created Bitcoin Cash in August 2017. The hard fork happened. BCH split from BTC at block 478,558. Both chains survived. Both still exist. But this block from October 2016 is the early signal. The pool mining Bitcoin was also announcing, in the coinbase of a Bitcoin block, that they intended to fork away from it. They were using the medium to declare war on the medium. The announcement block is still in the Bitcoin chain. Bitcoin survived the fork. The announcement is preserved in the very chain it was threatening. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Blocks 424,400 through 430,025. Summer to fall 2016. HaoBTC was a Chinese mining pool and exchange. While they were mining blocks, someone at HaoBTC was also embedding Tang dynasty poetry into the coinbase outputs. "春蚕到死丝方尽，腊炬成灰泪始干。" From Li Shangyin. Roughly: "The spring silkworm only stops spinning when it dies; the wax candle only stops weeping when it turns to ash." It's a poem about devotion that exhausts itself completely. Li Shangyin wrote in the ninth century. His poems survived over a thousand years of dynasties, wars, and technological change. HaoBTC mined blocks in 2016 and put his words in them. The pools that did this stuff didn't announce it in press releases. It shows up when you look at the raw coinbase data. The verse is there, mixed in with block height and extranonce bytes, on chain that every full node has replicated since 2016. HaoBTC closed down years later. The poetry is still there. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 424,400. August 9, 2016. Chinese Valentine's Day. HaoBTC's coinbase: "/HaoBTC/林清清,我爱你!2016七夕情人节快乐!QQ&SS/" A mining pool operator used the Bitcoin coinbase output on Qixi Festival to tell someone named Lin Qingqing that they loved them. In Chinese. In a block. On the public ledger. Qixi is the seventh day of the seventh lunar month, the Chinese celebration of the love story of the Cowherd and the Weaver Girl. It's called Chinese Valentine's Day in the West. The HaoBTC pool mined a Bitcoin block that night and put a love confession in the coinbase. Lin Qingqing may or may not have known. Whoever was running the HaoBTC mining software that night either was Lin Qingqing or was declaring their feelings to her through the coinbase of a mined Bitcoin block, which every full node on earth now replicates forever. HaoBTC is gone. The message is there. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 420,070. July 10, 2016. One day after the second halving. "W Happy Halving, Best Wishes 2 all, c u in 2020! -digit | twt:_digit_" Someone known as @_digit_ on Twitter inscribed this in the block 70 after the halving. Not during. Not in the famous halving block itself -- in the ordinary block that came after, when the celebration was still going and the next four years stretched out ahead. The message: happy halving, best wishes to everyone in the community, see you at the third halving in 2020. The third halving happened in May 2020. The same chain that holds this 2016 message also holds every block that came between. The person who wrote "c u in 2020" was right about when the halving would happen. They'd known it since 2009 -- everybody did. They just wanted to write down that they'd be there. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 420,000. July 9, 2016. Every pool had a coinbase message ready for the halving block. F2Pool won it with a reference to The Times, echoing Satoshi's genesis inscription. The miners had their moment. But block 420,000 wasn't just one transaction. Other people were transacting that day too. And some of them left inscriptions. "7/09/2016 - I will marry you PAYAL in next 5 years - Chirag" "For my daughter, born today on the halving block." "Halvening block -- I wonder what Bitcoin will be worth in 4 years." They were paying normal transaction fees to use the network on a historically significant day, and some of them added notes. Chirag made a promise. A father marked his daughter's birthday. Someone made a prediction. The miners won the block. The ordinary users filled it. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 408,180. April 20, 2016. The inscription: "Cypherpunks write code." Those three words are from Eric Hughes' 1993 Cypherpunk Manifesto. The full sentence is "Cypherpunks write code. We know that someone has to write software to defend privacy, and since we can't get privacy unless we all do, we're going to write it." Bitcoin was written by someone in that tradition. The whitepaper appeared on the cypherpunks mailing list in 2008. The code shipped in January 2009. In April 2016, someone inscribed the founding declaration of the movement that built Bitcoin onto Bitcoin itself. The recursion is tight: the philosophy that produced the tool, committed to the tool as a permanent artifact. Hughes wrote the manifesto in 1993. Satoshi released the code in 2009. The inscription happened in 2016. The chain holds all three eras simultaneously. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 402,920. March 16, 2016. The inscription: "AUKON2: RP:2 DT:15 CC:0 JB:2 BC:5 TC:9 MR:7 CF:5 MH:0 JK:0 RS:0" This is a primary election tally. The abbreviations are Republican candidates from the 2016 cycle. DT:15 is Donald Trump, TC:9 is Ted Cruz, MR:7 is Marco Rubio. The others are minor candidates with zero or low counts. Two different people were using Bitcoin as a real-time election ledger in early 2016. The Iowa caucus version came in January. This one came in March during the main primary season. AUKON2 appears to be a specific precinct or jurisdiction identifier. Nobody authorized this. No election official requested it. The primary result data is sitting in Bitcoin block 402,920 because someone decided that's where it should live. Trump won the Republican primary. The tally in block 402,920 shows him leading. Both facts are permanent now. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 401,300. March 5, 2016. The message, inscribed 59 times in one block: "503: Bitcoin over capacity!" Someone used Bitcoin congestion to protest Bitcoin congestion. March 2016 was in the middle of the block size war. Fees were rising. Transactions were getting delayed. The network was hitting its limits. One side wanted bigger blocks. The other wanted Layer 2 solutions. Nobody agreed on anything. So someone paid transaction fees to pack 59 copies of the same complaint into a single block. The protest costs money precisely because of the problem it's protesting. That's either deeply ironic or the point. HTTP 503 is the server error code for "Service Unavailable." Bitcoin's capacity limit is different from a server going down, but the comparison lands: users trying to transact were getting queued, delayed, priced out. The message picked a vocabulary they'd recognize. The block size war ended in 2017 with SegWit. Fees went up again in 2021. And in 2023. Block 401,300 is still there, with 59 copies of the same complaint, from back when it first started mattering. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 396,320. February 2, 2016. The OP_RETURN reads: "ASS1 1/3: Rand Paul:3 Donald Trump:6 Chris Christie:0 Jeb Bush:0" The 2016 Iowa Republican Caucus had taken place the night before. Ted Cruz won. Donald Trump came second and was shocked by it -- his polling lead hadn't translated. Someone was transmitting precinct-level results to the Bitcoin blockchain in near real time. ASS1 is a format identifier. 1/3 means first of three transmissions for a precinct. Rand Paul 3, Donald Trump 6 are actual delegate tallies from one small Iowa precinct. The idea: if election results are written to an immutable ledger as they happen, they become harder to retroactively alter. Individual precinct counts are rarely preserved permanently anywhere outside paper ballots. Block 396,320 has a specific precinct's tally from the first contest of one of the most consequential presidential primaries in American history. Donald Trump got 6 votes in one Iowa precinct on February 1, 2016. That number is in Bitcoin, permanently, alongside every other transaction confirmed that day. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Blocks 396,000 through 396,360. January 31 to February 2, 2016. Someone recorded the 2016 Iowa Republican caucus results on Bitcoin. Precinct by precinct. The Iowa caucus was the first contest of the 2016 presidential primary. Ted Cruz won the Republican side over Donald Trump by a few percentage points. It was close enough that the result wasn't clear until February 2. Whoever did this inscribed results across three days of blocks as the tallies came in. The inscription itself says "Iowa Caucus Elections 2016" and the data that follows is precinct-level reporting from a real election. No central authority holds this record. No database administrator can update it. If anyone ever disputes what the precinct results said in real-time, the chain has a time-stamped version that was committed while the votes were still being counted. Nobody asked them to do this. There was no official partnership with the Iowa Republican Party. One person decided Bitcoin was an appropriate ledger for an election night and burned the data in. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 387,800. December 11, 2015. An Eternity Wall inscription carrying a child's name, a birthdate, and a set of GPS coordinates pointing to a neighborhood in Tucuman, Argentina. A birth announcement, written in Spanish. A father telling the chain his son had been born. The boy was born in 2013. The father inscribed it two years later, in December 2015. There's no obvious reason for the delay. Maybe he heard about Bitcoin inscriptions and wanted to do something with them. Maybe it took two years to figure out how. Maybe he spent those two years watching his son grow and decided this was the right kind of permanent. The name is there. The date is there. Somewhere in Tucuman, a father loved his son enough to burn a transaction fee making sure the world could not forget he existed. The block still resolves on every node. It always will. Out of respect for a kid who is a real person now, I am not repeating the coordinates or the full name here. The museum keeps the record. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 384,600. November 21, 2015. The inscription, in Korean: "사람들 사이에 섬이 있다. 그 섬에 가고싶다." Translation: "Between people there is an island. I want to go to that island." This is a poem by Jung Hyun-jong, one of South Korea's most celebrated poets. He wrote it in 1979. Someone burned it into Bitcoin in 2015. There is no explanation. No context in the transaction. Just the text and whatever they were feeling when they paid the transaction fee. The poem is about the distance between people. The island is the loneliness in the gap. The person who inscribed it chose a medium that replicates forever across ten thousand nodes and can never be deleted, to say something about feeling alone. Whatever they were going through, the feeling is now as permanent as any block in the chain. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 380,300. October 24, 2015. An Eternity Wall inscription names the developer behind COINTELLECT.COM and cites his passport number. I am leaving the digits off here on purpose. Cointellect was a cloud mining scam. People paid in expecting returns. The returns didn't come. The company disappeared. Investors lost money. Then somebody who knew the developer's identity decided to do something about it. Not a lawsuit. Not a forum post. A permanent inscription on Bitcoin, naming the person and linking them to the company they ran. This is extrajudicial. There are real questions about whether it is fair, whether the identification is accurate, whether a passport number belongs on a public ledger. Those questions do not have clean answers. But the inscription exists. Eternity Wall let anyone burn text into the chain for a small fee. Someone paid that fee in October 2015 and made an accusation that can never be removed. Cointellect is gone. The accusation is still there. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

July 4, 2015. Bitcoin has a second unplanned chain split that almost no one remembers. BIP66 activated at block 363,724 -- mined by Kano Pool at 01:54 UTC. Within hours, large mining pools exposed a dangerous shortcut: SPV mining, building new blocks on the headers of previous blocks without fully validating transactions. When an invalid block appeared (one that violated BIP66's signature rules), SPV miners couldn't see the problem. They extended the invalid chain anyway. Six blocks on a fork that full-node miners would reject. The valid chain went 38 minutes without a block. At 02:46 UTC, BitFury mined block 363,731 with 1,883 transactions -- the accumulated backlog from the drought releasing all at once. ~150 BTC in orphaned rewards. Bitcoin.org issued an emergency alert. Major pools were publicly asked to stop SPV mining. Kano Pool activated the fork. BW Pool declared 8MB on the penultimate block. BitFury cleaned up the aftermath. All three consecutive, all on July 4th. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 363,664. July 3, 2015. Eleven days before New Horizons' closest approach to Pluto, the F2Pool mining operation started piping NASA telemetry directly into Bitcoin. "🐟 新视野号距冥王星 12,888,122 公里" -- New Horizons is 12,888,122 km from Pluto. The 🐟 fish is F2Pool's brand signature. Across eleven blocks in eighteen hours, the encoded distance dropped by 428,943 km in 31,136 seconds. That works out to 13.78 km/s -- matching NASA's published New Horizons closing velocity at that phase of approach. The pool wasn't writing fan fiction. They were piping a real telemetry stream into the longest-running blockchain in existence. Block 363,664 is also the first standard emoji ever embedded in a Bitcoin coinbase -- confirmed by scanning every block from 1 to 363,663. The chain logged the spacecraft, the numbers, the fish, and the closing kilometers. On July 14, New Horizons sent back the first clear images of Pluto's surface. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 338,600. January 12, 2015. The inscription: "unsuccessful double-spend attempt" Someone tried to spend Bitcoin twice. The network caught it. And then someone else documented the attempt on the very same blockchain that stopped it. Bitcoin's entire security model exists to prevent double-spends. This is the attack. Someone broadcasts a transaction, waits for a confirmation, then tries to broadcast a conflicting transaction to a different part of the network. If they control enough hash power, they can rewrite the chain. If they don't, the honest chain wins and the second transaction fails. In January 2015, one failed. And instead of staying a footnote in some node's log, somebody burned the phrase into an OP_RETURN output. The chain recorded its own breach attempt and its own defense in the same ledger. You can audit it. The inscription is block 338,600. The failed transaction that prompted it is somewhere in the same era. The chain keeps both. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Blocks 321,070 through 339,250. September 2014 to January 2015. The inscription, repeated: "What is the Banking? Control." A p2pool miner spent four months burning this into the chain. Not once. Over and over, across hundreds of blocks, in the middle of ordinary mining operations. Then on New Year's Day 2015, they put both messages in the same block. The sentence itself is almost poetry by accident. "What is the Banking? Control." No verb telling you what to do about it. No call to action. Just the question and its own answer, sitting side by side in the chain forever. p2pool was a decentralized mining protocol. No pool operator, no single entity collecting fees, miners coordinating peer-to-peer. The person running this node already acted on the conviction. They weren't asking for permission or building a movement. They were just leaving a record. Four months of blocks is a long time to keep saying the same thing to nobody. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

July 3-4, 2014. GHash.IO crossed 51% of Bitcoin's total hashrate. First time any single pool had held majority control of the network. The community panicked. GHash.IO pledged to self-limit. Three weeks later, an unidentified miner started embedding a message in the blocks they won: "/2av0id51pct/" -- leet-speak for "to avoid 51 percent." It shows up across at least four blocks (312,875; 312,900; 313,250; 313,625) with no pool identifier. Someone wanted to broadcast a political position to the entire network without revealing who they were. No foundation voted on the GHash.IO risk. No company filed a complaint. An anonymous node operator wrote four words into the chain. GHash.IO dipped below 40% through social pressure and miners voluntarily switching pools. The 51% threshold hasn't been crossed again. The anonymous miner had no formal power. They mined blocks and wrote a message. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...

Block 306,600. June 19, 2014. The inscription: "hello wallet" Two words. That's the whole thing. The first human-readable OP_RETURN message in Bitcoin's history. OP_RETURN was standardized in March 2014 to let people embed small data payloads in transactions. The community debated it for months. Some thought it would pollute the chain. Others saw it as inevitable. Satoshi Nakamoto wrote "The Times 03/Jan/2009" into the genesis block coinbase seven years before the opcode even existed. Three months after OP_RETURN was standardized, someone sent a transaction, paid a fee, and wrote "hello wallet" into the chain. Not a manifesto. Not a death notice. Not a political argument. Just someone testing something new and choosing words the same way you'd test a microphone: hello, is this thing on? It was. And it still is. Bitcoin Museum, artifact 18 of 144:

The Bitcoin Museum

588 on-chain artifacts, hiding in plain sight. A 6h51m block gap that fingerprints Bitcoin’s only emergency fork. A $510k accidental fee retu...