<p>Just for fun I made a program to list all record low hashes starting from block 1 ...</p>
<p>Max block count: 773048</p>
<pre><code>Block      1 : 00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048
Block      2 : 000000006a625f06636b8bb6ac7b960a8d03705d1ace08b1a19da3fdcc99ddbd
Block      4 : 000000004ebadb55ee9096c9a2f8880e09da59c0d68b1c228da88e48844a1485
Block      6 : 000000003031a0e73735690c5a1ff2a4be82553b2a12b776fbd3a215dc8f778d
Block     10 : 000000002c05cc2e78923c34df87fd108b22221ac6076c18f3ade378a4d915e9
Block     12 : 0000000027c2488e2510d1acf4369787784fa20ee084c258b58d9fbd43802b5e
Block     16 : 00000000174a25bb399b009cc8deff1c4b3ea84df7e93affaaf60dc3416cc4f5
Block     23 : 000000000cd339982e556dfffa9de94744a4135c53eeef15b7bcc9bdeb9c2182
Block     46 : 0000000002d5f429a2e3a9d9f82b777469696deb64038803c87833aa8ee9c08e
Block    113 : 00000000019176838de40606d70738084f2fbc48a50548eeeac3ceb857677c6d
Block    525 : 00000000015402dc2bcc4afdc3be3c58e873a7ecea22c12f72d6889eb9b9a0b1
Block    598 : 0000000000d16752cf56ebae77a37a8fa1ac8e234336a41622c3b7924a07a644
Block    722 : 000000000033b4ee1cc40f05145b1a3987cca2473589e7e23082996e2fe7c899
Block   1430 : 000000000009606d829b157912edb060c406b519fb2bfcc1078c196b69c67e49
Block  11686 : 00000000000243ab3dd422f82638c9651cfc401ac763b2228f00f6abae334f48
Block  43011 : 000000000000c09b5844620bdec4d533107844efea128a6ec6326dd92f6dc7e6
Block  55593 : 000000000000b545d467b95ad844b8c718f9b76e9426e4efab7e097ca09a83da
Block  60040 : 0000000000009f9f9991befc49dc787a190206d1dd32467b687e32157d48c651
Block  61068 : 000000000000177131355902f9a7a9d94d1f57aba9ef4430bb01123190325977
Block  73373 : 000000000000013af45c4ac4814ab12a69a6e65a40db0e1e3844fcb2ecaddb24
Block  89665 : 0000000000000062864d8512b92b2f6a0c2a9edcda82aae03063879b3869d507
Block  91940 : 000000000000004fa1186f88c245f89757b74b7ef1fa87302ab340b635686c1c
Block 101777 : 000000000000000834e72c05564b54cc21ac27fb0cbe4ec686bfe607273ad611
Block 114335 : 0000000000000006acb7899a26faa6290030e25ae41c8b3f62d69809994b89d8
Block 125552 : 00000000000000001e8d6829a8a21adc5d38d0a473b144b6765798e61f98bd1d
Block 206712 : 00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f
Block 239572 : 000000000000000006582fa9652895fda92c757ae6beee9dfbc3932125b5ab8e
Block 244583 : 000000000000000004ae693a1a8e740a33dd996c27ccc64217ed647e0b90d910
Block 258283 : 0000000000000000004bb6e7e2661661ba9809062d90c3121933d6d02c8bd763
Block 266381 : 000000000000000000028c32e6952731326747bae4be8db0f832d6eea0362050
Block 313338 : 00000000000000000000b7de9e5c19e52be073156924b7cf235efb27ae8a202a
Block 326055 : 000000000000000000007e1166d92acf81d4e2d95934fcdec1276b09a7db9390
Block 331908 : 000000000000000000006836c4009ab00485cd1de4d5958ca7839184d0b80067
Block 334261 : 000000000000000000002d414bb8f9175ba6c6563721e1ba2c1373c2bd94f29f
Block 368527 : 00000000000000000000013712632da34788a7b4ae2cd78f7982c7036610126b
Block 458091 : 00000000000000000000011246f099d94f91628d71c9d75ad2f9a06e2beb7e92
Block 500174 : 0000000000000000000000bb5b432a764ad6c7acf677dcd99161abfdf68e698e
Block 515910 : 0000000000000000000000ab789f6d71d9642ae3f697975ccd00afcb98fe6bd2
Block 585774 : 000000000000000000000019b43763eb4519f4fe65eae9be90fe73117b89026d
Block 634842 : 000000000000000000000003681c2df35533c9578fb6aace040b0dfe0d446413
Block 742035 : 000000000000000000000000fcb36c64b8a99acde151e61c933c6f7a57271db3
Block 756951 : 0000000000000000000000005d6f06154c8685146aa7bc3dc9843876c9cefd0f
</code></pre>

CC BY-SA 4.0
2021-03-31T10:05:22.930Z
Is the source to your program available?
RedGrittyBrick
CC BY-SA 4.0
2021-04-01T12:10:20.893Z
sure, it's here. https://github.com/Johanpmeert/LowBlockHashLister
But it uses my own java library to do rpc calls to a local node. That's also on github under JpmBitcoinRpcClient.
johanpm
CC BY-SA 4.0
2024-02-09T16:16:43.737Z
You should add dates to when the blocks were mined to this list :)
Thorkil Værge
CC BY-SA 4.0
2021-03-31T09:51:52.093Z
2023-01-22T07:31:06.653Z
2023-01-22T07:31:06.653Z
johanpm
<p>I don't think there is a site that will show you this information, but it is fairly trivial to find out.</p>
<p>Here's an old Bitcointalk thread that discusses this: <a href="https://bitcointalk.org/index.php?topic=29675.0" rel="nofollow noreferrer">https://bitcointalk.org/index.php?topic=29675.0</a></p>
<p>Here's a python script that will calculate it for you. You will need a bitcoind for it to connect to:</p>
<pre class="lang-py prettyprint-override"><code>from bitcoinrpc.authproxy import AuthServiceProxy, JSONRPCException
import binascii
import struct

def uint256_to_str(u):
    rs = b&quot;&quot;
    for i in range(8):
        rs += struct.pack(&quot;&lt;I&quot;, u &amp; 0xFFFFFFFF)
        u &gt;&gt;= 32
    return binascii.hexlify(rs)

def uint256_from_str(s):
    s = binascii.unhexlify(s)
    r = 0
    t = struct.unpack(&quot;&lt;IIIIIIII&quot;, s[:32])
    for i in range(8):
        r += t[i] &lt;&lt; (i * 32)
    return r

def byteswap(a):
    return &quot;&quot;.join(reversed([a[i:i+2] for i in range(0, len(a), 2)]))

# rpc_user and rpc_password are set in the bitcoin.conf file
rpc_user = &quot;user&quot;
rpc_password = &quot;password&quot;
rpc_connection = AuthServiceProxy(&quot;http://%s:%s@127.0.0.1:8332&quot;%(rpc_user, rpc_password))

best_hash = uint256_from_str(&quot;ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff&quot;)
best_height = 0
counter = 0

while True:
    try:
        commands = [ [ &quot;getblockhash&quot;, height] for height in range(counter, counter + 10000) ]
        block_hashes = rpc_connection.batch_(commands)
        
        for block_hash in block_hashes:
            block_uint256 =  uint256_from_str(byteswap(block_hash))
            if block_uint256 &lt; best_hash:
                best_hash = block_uint256
                best_height = counter
            counter += 1

        print(&quot;Processed &quot; + str(counter) + &quot; blocks&quot;)
    except Exception as e:
        print(e)
        break;

print(&quot;Lowest Block Hash: &quot; + byteswap(uint256_to_str(best_hash).decode()) + &quot; at block height &quot; + str(best_height))
</code></pre>
<p>This script gave me the following output:</p>
<pre><code>Lowest Block Hash: 00000000000000000000011246f099d94f91628d71c9d75ad2f9a06e2beb7e92 at block height 458091
</code></pre>

CC BY-SA 4.0
2017-10-13T05:17:11.580Z
2023-06-02T22:51:48.840Z
2023-06-02T22:51:48.840Z
Ava Chow
<p>As an alternative to syncing a full Bitcoin node, there is a <a href="https://console.cloud.google.com/bigquery" rel="nofollow noreferrer">BigQuery</a> public dataset for Bitcoin (and some <a href="https://cloud.google.com/blog/products/data-analytics/introducing-six-new-cryptocurrencies-in-bigquery-public-datasets-and-how-to-analyze-them" rel="nofollow noreferrer">other cryptocurrencies</a>):</p>
<pre class="lang-sql prettyprint-override"><code>SELECT
    `number`,
    `hash`
FROM 
    `bigquery-public-data.crypto_bitcoin.blocks` 
ORDER BY  
    `hash`
LIMIT 
    10
</code></pre>
<p>Results in JSON:</p>
<pre class="lang-json prettyprint-override"><code>[
  {
    &quot;number&quot;: &quot;634842&quot;,
    &quot;hash&quot;: &quot;000000000000000000000003681c2df35533c9578fb6aace040b0dfe0d446413&quot;
  },
  {
    &quot;number&quot;: &quot;585774&quot;,
    &quot;hash&quot;: &quot;000000000000000000000019b43763eb4519f4fe65eae9be90fe73117b89026d&quot;
  },
  {
    &quot;number&quot;: &quot;675600&quot;,
    &quot;hash&quot;: &quot;00000000000000000000001a9bf725a1f7d019440a04f39706c083751b62974d&quot;
  },
  {
    &quot;number&quot;: &quot;658771&quot;,
    &quot;hash&quot;: &quot;00000000000000000000001e9590a06c8452a3ce553834b2bab3daebf62f8b79&quot;
  },
  {
    &quot;number&quot;: &quot;679468&quot;,
    &quot;hash&quot;: &quot;0000000000000000000000250fae6b97e3241d86c65fb5be489875c49032b25b&quot;
  },
  {
    &quot;number&quot;: &quot;679848&quot;,
    &quot;hash&quot;: &quot;00000000000000000000002d142973ed07a220bf571360b70b90f4f0a1e739ce&quot;
  },
  {
    &quot;number&quot;: &quot;625857&quot;,
    &quot;hash&quot;: &quot;000000000000000000000030f8cf8e0a76db53525aff8d56dcfdf4c74fc7878c&quot;
  },
  {
    &quot;number&quot;: &quot;622050&quot;,
    &quot;hash&quot;: &quot;000000000000000000000031a10e42c80137b3c3ad3e15c5dfb4ea213c83e497&quot;
  },
  {
    &quot;number&quot;: &quot;664602&quot;,
    &quot;hash&quot;: &quot;000000000000000000000032ad53b18dadb72800d883f8e1188ceaa566b9a222&quot;
  },
  {
    &quot;number&quot;: &quot;696345&quot;,
    &quot;hash&quot;: &quot;00000000000000000000003c5c9269d93153a4eb8fabef76318d849a2ec2b29e&quot;
  }
]
</code></pre>

CC BY-SA 4.0
2021-10-15T13:30:48.113Z
2023-07-06T04:21:44.270Z
2023-07-06T04:21:44.270Z
penfold
<p>I improved on this to print the lowest 50 block hashes as well as their heights and the dates they were generated:</p>
<pre class="lang-py prettyprint-override"><code>from bitcoinrpc.authproxy import AuthServiceProxy, JSONRPCException
import datetime

# rpc_user and rpc_password are set in the bitcoin.conf file
rpc_user = &quot;user&quot;
rpc_password = &quot;password&quot;
rpc_connection = AuthServiceProxy(&quot;http://%s:%s@127.0.0.1:8332&quot; %
                                  (rpc_user, rpc_password))

block_cnt = rpc_connection.getblockcount()
block_hashes = []

for n in range(0, block_cnt, 1000):
    commands = [[&quot;getblockhash&quot;, h] for h in range(n, min(n+1000, block_cnt))]
    block_hashes += rpc_connection.batch_(commands)

block_hashes.sort()

commands = [[&quot;getblock&quot;, block_hash] for block_hash in block_hashes[0:50]]
blocks = rpc_connection.batch_(commands)

for block in blocks:
    time = datetime.datetime.fromtimestamp(block['time']).strftime('%Y-%m-%d')
    print(block['hash'], block['height'], time)
</code></pre>
<p>A new record was just set yesterday!</p>
<pre><code>0000000000000000000000bb5b432a764ad6c7acf677dcd99161abfdf68e698e 500174 2017-12-19
</code></pre>

CC BY-SA 4.0
2017-12-20T12:26:19.810Z
2023-06-03T13:56:44.063Z
2023-06-03T13:56:44.063Z
Clayton Smith
<p>The 12 lowest block hashes in Bitcoin as of Jan 22 2023:</p>
<ul>
<li>Block <code>756951</code> (<a href="https://mempool.space/block/0000000000000000000000005d6f06154c8685146aa7bc3dc9843876c9cefd0f" rel="noreferrer"><code>0000000000000000000000005d6f06154c8685146aa7bc3dc9843876c9cefd0f</code></a>)</li>
<li>Block <code>742035</code> (<a href="https://mempool.space/block/000000000000000000000000fcb36c64b8a99acde151e61c933c6f7a57271db3" rel="noreferrer"><code>000000000000000000000000fcb36c64b8a99acde151e61c933c6f7a57271db3</code></a>)</li>
<li>Block <code>768824</code> (<a href="https://mempool.space/block/00000000000000000000000351eae66e03ae45aad1be8f94d1ca5d6fe98b6efa" rel="noreferrer"><code>00000000000000000000000351eae66e03ae45aad1be8f94d1ca5d6fe98b6efa</code></a>)</li>
<li>Block <code>634842</code> (<a href="https://mempool.space/block/000000000000000000000003681c2df35533c9578fb6aace040b0dfe0d446413" rel="noreferrer"><code>000000000000000000000003681c2df35533c9578fb6aace040b0dfe0d446413</code></a>)</li>
<li>Block <code>585774</code> (<a href="https://mempool.space/block/000000000000000000000019b43763eb4519f4fe65eae9be90fe73117b89026d" rel="noreferrer"><code>000000000000000000000019b43763eb4519f4fe65eae9be90fe73117b89026d</code></a>)</li>
<li>Block <code>675600</code> (<a href="https://mempool.space/block/00000000000000000000001a9bf725a1f7d019440a04f39706c083751b62974d" rel="noreferrer"><code>00000000000000000000001a9bf725a1f7d019440a04f39706c083751b62974d</code></a>)</li>
<li>Block <code>733234</code> (<a href="https://mempool.space/block/00000000000000000000001c79ed1fce45cf47b145fc4564a979731765a0aeca" rel="noreferrer"><code>00000000000000000000001c79ed1fce45cf47b145fc4564a979731765a0aeca</code></a>)</li>
<li>Block <code>658771</code> (<a href="https://mempool.space/block/00000000000000000000001e9590a06c8452a3ce553834b2bab3daebf62f8b79" rel="noreferrer"><code>00000000000000000000001e9590a06c8452a3ce553834b2bab3daebf62f8b79</code></a>)</li>
<li>Block <code>679468</code> (<a href="https://mempool.space/block/0000000000000000000000250fae6b97e3241d86c65fb5be489875c49032b25b" rel="noreferrer"><code>0000000000000000000000250fae6b97e3241d86c65fb5be489875c49032b25b</code></a>)</li>
<li>Block <code>738031</code> (<a href="https://mempool.space/block/000000000000000000000027ecac06b57e047cf42357d584ffe5bae94ae29a5b" rel="noreferrer"><code>000000000000000000000027ecac06b57e047cf42357d584ffe5bae94ae29a5b</code></a>)</li>
<li>Block <code>724691</code> (<a href="https://mempool.space/block/00000000000000000000002a2a53d24ef9e2f8eb8dd628e603bfcac472aeffc3" rel="noreferrer"><code>00000000000000000000002a2a53d24ef9e2f8eb8dd628e603bfcac472aeffc3</code></a>)</li>
<li>Block <code>679848</code> (<a href="https://mempool.space/block/00000000000000000000002d142973ed07a220bf571360b70b90f4f0a1e739ce" rel="noreferrer"><code>00000000000000000000002d142973ed07a220bf571360b70b90f4f0a1e739ce</code></a>)</li>
</ul>

CC BY-SA 3.0
2017-12-17T04:09:52.173Z
I'd be interested to know how you generated this list, and why you decided to post the lowest 12.
Adam Millerchip
CC BY-SA 3.0
2017-12-17T05:59:16.960Z
I run http://bitcoin.sipa.be and the website data is generated from a text file with a list of all blocks with hash and height. I sorted the file based on hash and posted the top 12, to give an idea of how common the top number of zeroes is.
Pieter Wuille
CC BY-SA 4.0
2023-12-12T18:20:11.247Z
The following equation estimates total chain work based on just 1 of the lowest hashes and its rank. Chain_work = (2^256-1) * (N-1) / Nth_smallest_hash.  Stdev error =~ 1/SQRT(N). But for the lowest hash N=1, experiment requires replacing the N-1 with 1/12 which has 5,000% stdev err.
zawy
CC BY-SA 4.0
2017-12-16T20:53:43.633Z
2023-01-22T07:41:59.017Z
2023-01-22T07:41:59.017Z
Pieter Wuille
<p>Let's assume, the hash <code>00000000000000000024c0bdbec66a889778c00bc69be0a96cbbd98b75c3ce09</code> of block #499644 is smaller than <code>
0000000000000000002d429f39afec70c938e888c3417d690bbc85e83529991c</code> of block #499645.</p>

<p>They both have 18 Zeros, then <code>2=2</code>, but then <code>4&lt;d</code>.</p>

<p>Which is the smallest hash that has ever been hashed during cryptomining? How many zeros? Which block?</p>

<blockchain><block><hash><sha256>
Which is the smallest hash that has ever been hashed?
hardfork
# Which is the smallest hash that has ever been hashed?

(Asked by: username_0 on 2017-12-16)

Let's assume, the hash `00000000000000000024c0bdbec66a889778c00bc69be0a96cbbd98b75c3ce09` of block #499644 is smaller than `0000000000000000002d429f39afec70c938e888c3417d690bbc85e83529991c` of block #499645.

They both have 18 Zeros, then `2=2`, but then `4<d`.

Which is the smallest hash that has ever been hashed during cryptomining? How many zeros? Which block?

**Tags:** blockchain, block, hash, sha256


---

## 5 answers

### Answer by username_7 on 2017-12-16. Score: 11 | Accepted answer

The 12 lowest block hashes in Bitcoin as of Jan 22 2023:

* Block `756951` ([`0000000000000000000000005d6f06154c8685146aa7bc3dc9843876c9cefd0f`](https://mempool.space/block/0000000000000000000000005d6f06154c8685146aa7bc3dc9843876c9cefd0f))
* Block `742035` ([`000000000000000000000000fcb36c64b8a99acde151e61c933c6f7a57271db3`](https://mempool.space/block/000000000000000000000000fcb36c64b8a99acde151e61c933c6f7a57271db3))
* Block `768824` ([`00000000000000000000000351eae66e03ae45aad1be8f94d1ca5d6fe98b6efa`](https://mempool.space/block/00000000000000000000000351eae66e03ae45aad1be8f94d1ca5d6fe98b6efa))
* Block `634842` ([`000000000000000000000003681c2df35533c9578fb6aace040b0dfe0d446413`](https://mempool.space/block/000000000000000000000003681c2df35533c9578fb6aace040b0dfe0d446413))
* Block `585774` ([`000000000000000000000019b43763eb4519f4fe65eae9be90fe73117b89026d`](https://mempool.space/block/000000000000000000000019b43763eb4519f4fe65eae9be90fe73117b89026d))
* Block `675600` ([`00000000000000000000001a9bf725a1f7d019440a04f39706c083751b62974d`](https://mempool.space/block/00000000000000000000001a9bf725a1f7d019440a04f39706c083751b62974d))
* Block `733234` ([`00000000000000000000001c79ed1fce45cf47b145fc4564a979731765a0aeca`](https://mempool.space/block/00000000000000000000001c79ed1fce45cf47b145fc4564a979731765a0aeca))
* Block `658771` ([`00000000000000000000001e9590a06c8452a3ce553834b2bab3daebf62f8b79`](https://mempool.space/block/00000000000000000000001e9590a06c8452a3ce553834b2bab3daebf62f8b79))
* Block `679468` ([`0000000000000000000000250fae6b97e3241d86c65fb5be489875c49032b25b`](https://mempool.space/block/0000000000000000000000250fae6b97e3241d86c65fb5be489875c49032b25b))
* Block `738031` ([`000000000000000000000027ecac06b57e047cf42357d584ffe5bae94ae29a5b`](https://mempool.space/block/000000000000000000000027ecac06b57e047cf42357d584ffe5bae94ae29a5b))
* Block `724691` ([`00000000000000000000002a2a53d24ef9e2f8eb8dd628e603bfcac472aeffc3`](https://mempool.space/block/00000000000000000000002a2a53d24ef9e2f8eb8dd628e603bfcac472aeffc3))
* Block `679848` ([`00000000000000000000002d142973ed07a220bf571360b70b90f4f0a1e739ce`](https://mempool.space/block/00000000000000000000002d142973ed07a220bf571360b70b90f4f0a1e739ce))

> **Comments:**
> **username_8**: I'd be interested to know how you generated this list, and why you decided to post the lowest 12.  
> **username_7**: I run http://bitcoin.sipa.be and the website data is generated from a text file with a list of all blocks with hash and height. I sorted the file based on hash and posted the top 12, to give an idea of how common the top number of zeroes is.  
> **username_9**: The following equation estimates total chain work based on just 1 of the lowest hashes and its rank. Chain_work = (2^256-1) * (N-1) / Nth_smallest_hash.  Stdev error =~ 1/SQRT(N). But for the lowest hash N=1, experiment requires replacing the N-1 with 1/12 which has 5,000% stdev err.  

---

### Answer by username_1 on 2021-03-31. Score: 7

Just for fun I made a program to list all record low hashes starting from block 1 ...

Max block count: 773048

```
Block      1 : 00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048
Block      2 : 000000006a625f06636b8bb6ac7b960a8d03705d1ace08b1a19da3fdcc99ddbd
Block      4 : 000000004ebadb55ee9096c9a2f8880e09da59c0d68b1c228da88e48844a1485
Block      6 : 000000003031a0e73735690c5a1ff2a4be82553b2a12b776fbd3a215dc8f778d
Block     10 : 000000002c05cc2e78923c34df87fd108b22221ac6076c18f3ade378a4d915e9
Block     12 : 0000000027c2488e2510d1acf4369787784fa20ee084c258b58d9fbd43802b5e
Block     16 : 00000000174a25bb399b009cc8deff1c4b3ea84df7e93affaaf60dc3416cc4f5
Block     23 : 000000000cd339982e556dfffa9de94744a4135c53eeef15b7bcc9bdeb9c2182
Block     46 : 0000000002d5f429a2e3a9d9f82b777469696deb64038803c87833aa8ee9c08e
Block    113 : 00000000019176838de40606d70738084f2fbc48a50548eeeac3ceb857677c6d
Block    525 : 00000000015402dc2bcc4afdc3be3c58e873a7ecea22c12f72d6889eb9b9a0b1
Block    598 : 0000000000d16752cf56ebae77a37a8fa1ac8e234336a41622c3b7924a07a644
Block    722 : 000000000033b4ee1cc40f05145b1a3987cca2473589e7e23082996e2fe7c899
Block   1430 : 000000000009606d829b157912edb060c406b519fb2bfcc1078c196b69c67e49
Block  11686 : 00000000000243ab3dd422f82638c9651cfc401ac763b2228f00f6abae334f48
Block  43011 : 000000000000c09b5844620bdec4d533107844efea128a6ec6326dd92f6dc7e6
Block  55593 : 000000000000b545d467b95ad844b8c718f9b76e9426e4efab7e097ca09a83da
Block  60040 : 0000000000009f9f9991befc49dc787a190206d1dd32467b687e32157d48c651
Block  61068 : 000000000000177131355902f9a7a9d94d1f57aba9ef4430bb01123190325977
Block  73373 : 000000000000013af45c4ac4814ab12a69a6e65a40db0e1e3844fcb2ecaddb24
Block  89665 : 0000000000000062864d8512b92b2f6a0c2a9edcda82aae03063879b3869d507
Block  91940 : 000000000000004fa1186f88c245f89757b74b7ef1fa87302ab340b635686c1c
Block 101777 : 000000000000000834e72c05564b54cc21ac27fb0cbe4ec686bfe607273ad611
Block 114335 : 0000000000000006acb7899a26faa6290030e25ae41c8b3f62d69809994b89d8
Block 125552 : 00000000000000001e8d6829a8a21adc5d38d0a473b144b6765798e61f98bd1d
Block 206712 : 00000000000000000ae2dba9951e28a3e6308ac7e9e8536104c503aa772c848f
Block 239572 : 000000000000000006582fa9652895fda92c757ae6beee9dfbc3932125b5ab8e
Block 244583 : 000000000000000004ae693a1a8e740a33dd996c27ccc64217ed647e0b90d910
Block 258283 : 0000000000000000004bb6e7e2661661ba9809062d90c3121933d6d02c8bd763
Block 266381 : 000000000000000000028c32e6952731326747bae4be8db0f832d6eea0362050
Block 313338 : 00000000000000000000b7de9e5c19e52be073156924b7cf235efb27ae8a202a
Block 326055 : 000000000000000000007e1166d92acf81d4e2d95934fcdec1276b09a7db9390
Block 331908 : 000000000000000000006836c4009ab00485cd1de4d5958ca7839184d0b80067
Block 334261 : 000000000000000000002d414bb8f9175ba6c6563721e1ba2c1373c2bd94f29f
Block 368527 : 00000000000000000000013712632da34788a7b4ae2cd78f7982c7036610126b
Block 458091 : 00000000000000000000011246f099d94f91628d71c9d75ad2f9a06e2beb7e92
Block 500174 : 0000000000000000000000bb5b432a764ad6c7acf677dcd99161abfdf68e698e
Block 515910 : 0000000000000000000000ab789f6d71d9642ae3f697975ccd00afcb98fe6bd2
Block 585774 : 000000000000000000000019b43763eb4519f4fe65eae9be90fe73117b89026d
Block 634842 : 000000000000000000000003681c2df35533c9578fb6aace040b0dfe0d446413
Block 742035 : 000000000000000000000000fcb36c64b8a99acde151e61c933c6f7a57271db3
Block 756951 : 0000000000000000000000005d6f06154c8685146aa7bc3dc9843876c9cefd0f

```

> **Comments:**
> **username_2**: Is the source to your program available?  
> **username_1**: sure, it's here. https://github.com/Johanpmeert/LowBlockHashLister But it uses my own java library to do rpc calls to a local node. That's also on github under JpmBitcoinRpcClient.  
> **username_3**: You should add dates to when the blocks were mined to this list :)  

---

### Answer by username_4 on 2017-10-13. Score: 5

I don't think there is a site that will show you this information, but it is fairly trivial to find out.

Here's an old Bitcointalk thread that discusses this: <https://bitcointalk.org/index.php?topic=29675.0>

Here's a python script that will calculate it for you. You will need a bitcoind for it to connect to:

```py
from bitcoinrpc.authproxy import AuthServiceProxy, JSONRPCException
import binascii
import struct

def uint256_to_str(u):
    rs = b""
    for i in range(8):
        rs += struct.pack("<I", u & 0xFFFFFFFF)
        u >>= 32
    return binascii.hexlify(rs)

def uint256_from_str(s):
    s = binascii.unhexlify(s)
    r = 0
    t = struct.unpack("<IIIIIIII", s[:32])
    for i in range(8):
        r += t[i] << (i * 32)
    return r

def byteswap(a):
    return "".join(reversed([a[i:i+2] for i in range(0, len(a), 2)]))

# rpc_user and rpc_password are set in the bitcoin.conf file
rpc_user = "user"
rpc_password = "password"
rpc_connection = AuthServiceProxy("http://%s:%s@127.0.0.1:8332"%(rpc_user, rpc_password))

best_hash = uint256_from_str("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")
best_height = 0
counter = 0

while True:
    try:
        commands = [ [ "getblockhash", height] for height in range(counter, counter + 10000) ]
        block_hashes = rpc_connection.batch_(commands)
        
        for block_hash in block_hashes:
            block_uint256 =  uint256_from_str(byteswap(block_hash))
            if block_uint256 < best_hash:
                best_hash = block_uint256
                best_height = counter
            counter += 1

        print("Processed " + str(counter) + " blocks")
    except Exception as e:
        print(e)
        break;

print("Lowest Block Hash: " + byteswap(uint256_to_str(best_hash).decode()) + " at block height " + str(best_height))

```

This script gave me the following output:

```
Lowest Block Hash: 00000000000000000000011246f099d94f91628d71c9d75ad2f9a06e2beb7e92 at block height 458091

```


---

### Answer by username_5 on 2021-10-15. Score: 5

As an alternative to syncing a full Bitcoin node, there is a [BigQuery](https://console.cloud.google.com/bigquery) public dataset for Bitcoin (and some [other cryptocurrencies](https://cloud.google.com/blog/products/data-analytics/introducing-six-new-cryptocurrencies-in-bigquery-public-datasets-and-how-to-analyze-them)):

```sql
SELECT
    `number`,
    `hash`
FROM 
    `bigquery-public-data.crypto_bitcoin.blocks` 
ORDER BY  
    `hash`
LIMIT 
    10

```

Results in JSON:

```json
[
  {
    "number": "634842",
    "hash": "000000000000000000000003681c2df35533c9578fb6aace040b0dfe0d446413"
  },
  {
    "number": "585774",
    "hash": "000000000000000000000019b43763eb4519f4fe65eae9be90fe73117b89026d"
  },
  {
    "number": "675600",
    "hash": "00000000000000000000001a9bf725a1f7d019440a04f39706c083751b62974d"
  },
  {
    "number": "658771",
    "hash": "00000000000000000000001e9590a06c8452a3ce553834b2bab3daebf62f8b79"
  },
  {
    "number": "679468",
    "hash": "0000000000000000000000250fae6b97e3241d86c65fb5be489875c49032b25b"
  },
  {
    "number": "679848",
    "hash": "00000000000000000000002d142973ed07a220bf571360b70b90f4f0a1e739ce"
  },
  {
    "number": "625857",
    "hash": "000000000000000000000030f8cf8e0a76db53525aff8d56dcfdf4c74fc7878c"
  },
  {
    "number": "622050",
    "hash": "000000000000000000000031a10e42c80137b3c3ad3e15c5dfb4ea213c83e497"
  },
  {
    "number": "664602",
    "hash": "000000000000000000000032ad53b18dadb72800d883f8e1188ceaa566b9a222"
  },
  {
    "number": "696345",
    "hash": "00000000000000000000003c5c9269d93153a4eb8fabef76318d849a2ec2b29e"
  }
]

```


---

### Answer by username_6 on 2017-12-20. Score: 3

I improved on this to print the lowest 50 block hashes as well as their heights and the dates they were generated:

```py
from bitcoinrpc.authproxy import AuthServiceProxy, JSONRPCException
import datetime

# rpc_user and rpc_password are set in the bitcoin.conf file
rpc_user = "user"
rpc_password = "password"
rpc_connection = AuthServiceProxy("http://%s:%s@127.0.0.1:8332" %
                                  (rpc_user, rpc_password))

block_cnt = rpc_connection.getblockcount()
block_hashes = []

for n in range(0, block_cnt, 1000):
    commands = [["getblockhash", h] for h in range(n, min(n+1000, block_cnt))]
    block_hashes += rpc_connection.batch_(commands)

block_hashes.sort()

commands = [["getblock", block_hash] for block_hash in block_hashes[0:50]]
blocks = rpc_connection.batch_(commands)

for block in blocks:
    time = datetime.datetime.fromtimestamp(block['time']).strftime('%Y-%m-%d')
    print(block['hash'], block['height'], time)

```

A new record was just set yesterday!

```
0000000000000000000000bb5b432a764ad6c7acf677dcd99161abfdf68e698e 500174 2017-12-19

```


---

