mempool

Explore the full Bitcoin ecosystem with mempool.space •
Be your own explorer with The Mempool Open Source ProjectⓇ •
Stuck transaction? Mempool AcceleratorⓇ fixes this ✨

Public Key

npub18d4r6wanxkyrdfjdrjqzj2ukua5cas669ew2g5w7lf4a8te7awzqey6lt3

NIP-05 Address

mempool.space

Profile Code

nprofile1qqsrk63a8wentzpk5ex3eqpf9wtww6vwcddzuh9y2800567n4ulwhpqpp3mhxue69uhkyunz9e5k7qg5waehxw309a3xcctnw3ezue3h0gh8s7t6tft8tf

Publishing to

thecitadel.nostr1.com/sierra

Author Public Key

npub18d4r6wanxkyrdfjdrjqzj2ukua5cas669ew2g5w7lf4a8te7awzqey6lt3

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Last Notes

2026-02-11 19:12:52 UTC

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👀

2026-01-19 02:34:54 UTC

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don't forget mempoo.space, another one of our distinguished closed-source projects

2025-12-23 00:49:49 UTC

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and it updates in real-time 💜
well-done!!

2025-06-06 06:02:25 UTC

https://image.nostr.build/dbfef355fb0f6d377e58478a781ddfc37598f0fe743031b4605e6bf9307a1b3e.jpg

2025-05-08 22:03:09 UTC

Great time to revisit this excellent series by glozow and murch on mempools and relay policy
https://bitcoinops.org/en/blog/waiting-for-confirmation/

2025-04-09 02:18:52 UTC

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Full changelog and release notes:
https://github.com/mempool/mempool/releases/tag/v3.2.0

2025-04-09 02:16:44 UTC

The Mempool Open Source Project® v3.2.0 is here!
Highlights:
- Support for v3 transactions
- Support for anchor outputs
- New UTXO bubble chart on the address page
- DATUM miner tags
- Tags to identify runestone messages and inscriptions
- Package broadcast
- Stratum job data visualizations
- Taproot multisig labels
- Transaction & PSBT preview feature
- Address poisoning detection
Coming soon to your self-hosted app store on @nprofile…jjxr, @nprofile…d6j2, MyNode, RaspiBlitz, and nix-bitcoin. Or use our Docker images and build your own Bitcoin full stack from scratch!
https://image.nostr.build/db3ec712fddef6aee383df34b2da5999dccad49ebf95795502b5ea58f90b4390.jpg
https://image.nostr.build/06347805d93f1057c3f2b69157e558c07e64febe15b81286cea90ca0a5635c6c.jpg
https://image.nostr.build/dc1df4d9124d5461864c837ef352317f0ea54484d2e7da0d5335d6af17df7ddc.jpg

2025-03-11 01:06:13 UTC

You can just make a 1 s/vb tx

2025-01-31 03:21:23 UTC

https://image.nostr.build/be2351def640ca9f4de4978a04f74ceb63761b61db92cac60e79cd6a8fce6780.jpg

2024-12-23 00:00:54 UTC

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🤙

2024-09-20 15:27:20 UTC

Approximately 60% of bitcoin blocks are merge mining other chains (since the last halving).
That's down from a peak of 96% in April 2020.
For our latest @npub1m7q…m4gz report, @npub18h0…ws8m analysed which merge mining schemes are in use, and which miners are using them.
Looking at recent data we see different miner / pool groups.
Group 1. No Merge Mining
Foundry, MARA, SBI Crypto
Group 2. AuxPow & “Chain A”
ViaBTC, F2Pool & Luxor
Group 3. Distinct switching pattern
Binance Pool, BTCcom, Poolin, Braiins, ULTIMUS
Group 4. Other
Antpool, SECPOOL
Taking a longer view looking back to the genesis block we see that adoption of schemes has fluctuated wildly over time!
Read the short report here:
https://research.mempool.space/merge-mining-report/
https://m.primal.net/Kvot.jpg

2024-09-16 22:18:59 UTC

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good looks, did make that change but don't remember it causing high resource usage...just wanted to get rid of the log messages 😁

2024-09-11 20:46:52 UTC

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raspibolt guide looks old. just tested v3.0 with fulcrum according to our documentation for a fully manual install and it's working fine so far.
https://github.com/mempool/mempool/tree/master/backend
https://github.com/mempool/mempool/tree/master/frontend
recommend cross-referencing with our docs to see if you missed anything.
will run and observe for a day or so.

2024-09-09 15:21:48 UTC

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what does your setup look like? docker for mempool? have you tried running mempool with just bitcoind (i.e. without fulcrum)?

2024-08-30 18:50:47 UTC

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sweet setup you've got there ;)

2024-08-28 04:42:11 UTC

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how are you running mempool? are you using umbrel, or something else?

2024-08-27 15:25:12 UTC

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Check out the full changelog on GitHub:
https://github.com/mempool/mempool/releases/tag/v3.0.0

2024-08-27 15:24:15 UTC

The Mempool Open Source Project® v3.0.0 is here!
Over 5 years in the making, 10,000+ commits...and available for you to host on your very own server.
Major new features include:
- Mempool Accelerator™
- Mempool Goggles™
- RBF timelines
- And more!
Coming soon for 1-click installation on @nprofile…jjxr, @nprofile…w0xz, myNode, RaspiBlitz, RoninDojo, and nix-bitcoin.
As always, Docker images are also available if you want to DIY!
https://image.nostr.build/6ba12c52d96024d465b6b34b5374bfcf3d1a8465501af8690345a6cb2eaa3e14.jpg

2024-08-26 17:04:12 UTC

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GM 💜

2024-08-13 18:28:07 UTC

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love to see it!! tell him we said thanks! now you gotta get him on nostr 🙌

2024-08-06 22:10:48 UTC

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always a good time to do this, even if fees are not low

2024-08-05 01:01:19 UTC

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h/t @nprofile…3eqv

2024-08-05 01:00:57 UTC

https://image.nostr.build/86243a4b935edf1595c86519a9113e04b70994c51b7c278c811cd64e811a4ba4.jpg

2024-08-01 12:03:22 UTC

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🫡

2024-07-30 19:07:44 UTC

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thank 𝙮𝙤𝙪 for supporting the mempool open source project!

2024-07-29 14:42:08 UTC

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While the service is centralised any pool / miner that wishes to join can do so, improving access to out of band fee revenue for smaler mining pools / miners.
The 5 pools / miners currently contributing to Mempool Accelerator represent 40% of the network hashrate.
Read more here:
https://mempool.space/accelerator

2024-07-29 13:17:16 UTC

Integrate Mempool Accelerator™ into your app or website today.
Pay for each acceleration using lightning with the public API, or pay using Mempool Accelerator™ Pro account credit using the authenticated API.
https://mempool.space/docs/api/rest#accelerator-get-invoice

2024-07-27 16:05:43 UTC

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More details and answers to many of the frequently asked questions can be found here:
https://mempool.space/accelerator

2024-07-27 16:03:58 UTC

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View live accelerations and statistics on the Aceleration Dashboard
https://mempool.space/acceleration

2024-07-27 16:01:26 UTC

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As part of our mission to improve transparency, the block audit feature has been updated to incorporate acceleration bid boosts (the numbers in purple).
https://m.primal.net/JgLE.mp4

2024-07-27 15:58:14 UTC

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How does Mempool Accelerator™ work?
We send your acceleration request to all of our mining pool partners, who prioritize your transaction based on your new accelerated fee rate.
To improve transparency all active and completed accelerations are publicly visible on the Mempool Accelerator™ dashboard and via our APIs.
Watch active accelerations appear in the next projected block live as they’re made.
https://m.primal.net/JgLC.mp4

2024-07-27 15:57:23 UTC

Stuck Transaction?
Mempool Accelerator™ fixes this
Launch of open beta starts today!
Click Accelerate from the transaction page and pay with lightning or fiat.
No sign up necessary.
Initial mining pool partners make up 40% of Bitcoin’s global hashrate: Foundry USA Pool , MARA, SBICrypto, SpiderPool and @npub1qtv…7dze
https://m.primal.net/JgHz.mp4

2024-07-24 15:28:28 UTC

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👀

2024-07-15 18:41:31 UTC

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we don't run a signet faucet but we do run a testnet4 faucet
https://mempool.space/testnet4/faucet
have you tried https://signetfaucet.com?

2024-07-13 13:20:02 UTC

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check out our faq here:
https://mempool.space/accelerator

2024-07-09 05:37:54 UTC

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can't make it out from the picture but we'll take your word for it 🤙

2024-07-07 06:17:47 UTC

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sounds like a cool idea for a browser extension

2024-07-07 04:38:55 UTC

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good idea, we'll do that to celebrate taking down the 5 s/vb wall

2024-07-07 03:44:42 UTC

Backlog of >6 s/vb transactions cleared, now onto 5 s/vb.
https://image.nostr.build/8de7dfc7e4f0a4592a3dc31d0fe64d24bdf4eb45b6cc2793b8f04e60a483f9be.jpg

2024-07-07 03:17:24 UTC

Happy to announce that our new Community Sponsor program is now live!
Support The Mempool Open Source Project and get t-shirts, color-changing mugs, and more as a gift in return.
Sign up now -- swag just started shipping!
https://mempool.space/sponsor

2024-07-06 23:43:45 UTC

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https://mempool.space/graphs/mempool

2024-06-28 07:59:20 UTC

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thank you for being a great artist.
the pieces are beautiful 🤝

2024-06-06 06:25:04 UTC

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Empty Bitcoin blocks occur when miners find a block using an empty template. Many pools send empty templates to miners because they’re faster to distribute, helping miners start work slightly sooner.
10.6% of all Bitcoin blocks to date were empty, the majority of which were in the early days when there were very few transactions.
Over time this rate has dropped significantly, and now ranges from 0.15% to 0.5% at the network level https://image.nostr.build/40d41a07db11de81f8c7f02c40768dc1d90d13822db915cff84b68424193f4c7.jpg

2024-06-06 06:24:09 UTC

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Follow mempool research on nostr!
@npub1m7q…m4gz

2024-06-06 06:17:51 UTC

Check out our inaugural mempool research report which dives deep into the empty block phenomenon!
https://research.mempool.space/empty-block-report

2024-04-05 05:56:42 UTC

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yes -- at the moment, block health is intended to be a measure of intentional *exclusion*
https://mempool.space/docs/faq#what-is-block-health

2024-01-06 09:45:36 UTC

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Default core policy is to treat each Sigop as though it has a 20 byte size. These transactions with many sigops are therefore treated as though they have a lower fee rate.

2024-01-05 22:46:04 UTC

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The linked transactions have a large number of sigops (241).
Default bitcoin core transaction selection treats sigop's as though they have a larger size than they do. This means that these transactions are treated as though they have a significantly lower fee rate (half in this case)
https://github.com/bitcoin/bitcoin/blob/82ba0f80a0b56bb160c8be1fddd82dbbc4fb3947/src/policy/policy.h#L37
static constexpr unsigned int DEFAULT_BYTES_PER_SIGOP{20};

2024-01-05 18:07:13 UTC

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Thanks, investigating.

2024-01-01 16:38:42 UTC

2024 is the year we accelerate
Sign up to get notified when Mempool Accelerator launches.
https://mempool.space/signup

2023-12-30 15:44:27 UTC

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Thanks for the bug report.
If possible please can you share the device and browser you are using via DM

2023-12-30 15:34:05 UTC

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Working on it!

2023-12-28 07:20:37 UTC

Introducing Mempool Goggles!
Have you ever wished you had x-ray specs to see exactly what's inside the mempool?
No, me neither, but we built you a pair anyway.
https://image.nostr.build/6dfffff690ae12803d3646886ba448f2dfb1b9a1e4d3be35963bee0afdc9d8ec.jpg#m=image%2Fjpeg&dim=893x900&blurhash=%7CAGjj%3D%2BwDgE01OKHD%7D-%40%238o%5Df-sFr%3ASJa*xGX8NFD4S%5Eb%24gRT3rY%255Z%7CO%3FrxwHJNKR%24%2BfzJ7nNxcOtWHg9nJj9TKi%5DW%3DV%40nMbuxwnNNHe%3AoHkCWS5ts*xlR%3Az%3FajT0bvS%24ktNHnLt7NZw%40R%3BT1w%5EJENem*XUPD%23%7Es%2BnOr%3F&x=a1f1c72026d28ee865cc29a3c2a0da3bfe676f5f3ad35374b9f1898f27a17e02
Click on the Mempool Goggles icon at the top left of the mempool block visualization to reveal the new filter menu.
There are 25 different categories to explore, or mix-and-match to narrow down your focus even further.
https://image.nostr.build/989f42be01721cedfac90f517c83d3dd0791bd0699b7ab62e6a13586c5fca1ae.jpg#m=image%2Fjpeg&dim=669x680&blurhash=%7C29ZWg*JS6XR9_In0zRO0f-%3AoM%251kWkXs%2CR.w%5BIV9EMdtlWYbHxao%23xtj%5E%25Ms%3Bt7V%40kCoeRjt6R-9ERPoyV%40tlt7ogxaa%23VrM%7Bg3bIR*oLbct7o2EhV%40ofogf5ofV%40o0ofIAR%25R%2BaKWBflj%3FW%3DxtGbs%3ARPWVZ%7ER*slR-t6&x=78b74823e7a3f02cefef36ed5c2f7eb2ef596bae239446ff995de73ec8efd13a
Want to see how much of the mempool is occupied by monkey jpegs? Try the "Inscription" filter.
Curious how many transactions use both RBF and CPFP to bump fees? Hit the "Replacement" and "Pays for parent" filters.
https://image.nostr.build/faf9fcc03e238f6dcdfc9a6db242521816f4aca3e6b43c7fd83a0bd07bb1ff69.jpg#m=image%2Fjpeg&dim=669x680&blurhash=%7C29PQd%5Ek1PNZ0%7CaIEfNGxHtTx%5ExuoIacRhRiaeo3Bqkr%252oIjDngngniWXOtT1X9sls8ngr%3DWBS4BWXAxaj%3Fn%23nhWAaxWXs%3BShoLxFS1axf5S2WWE%25WBjYa%7Ds%3Aofs%3AW%3BS2V%3FV%3FjEWXSis%3Bs%3BofWoM%7BV%3DnhS5S%24bdogs%3AoJ&x=81cf8255ab24c9456ed933da5f475b24f76334c8d3e20637aad3420af5f108f7
From simple mempool analysis to advanced technical insights, Mempool Goggles has something for everyone.
Check it out now on the mempool block page
https://mempool.space/mempool-block/0

2023-12-28 07:17:21 UTC

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block health is not intended to be a measure of how closely an expected block resembles an actual block. The actual block can be vastly different from the expected block, but if no transactions appear to be intentionally excluded, it will have a high health rating
https://mempool.space/docs/faq#what-is-block-health

2023-09-30 13:55:34 UTC

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There is no API call for the number of mempol blocks, but this can be estimated by dividing the sum of the vBytes in the mempool by 1,000,000
The number of unconfirmed transactions can be called directly.
Here is a python example:
import json
import requests
import math
# Approximate number of blocks in mempool.space's mempool
total_blockVSize = sum(item['blockVSize'] for item in requests.get('https://mempool.space/api/v1/fees/mempool-blocks').json())
block_count_estimate = math.ceil(total_blockVSize/1000000)
print("Unconfirmed block count: ", block_count_estimate)
# Get transaction count
transaction_count = requests.get("https://mempool.space/api/mempool").json()['count']
print("Transaction count:", transaction_count)

2023-09-28 15:08:39 UTC

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👌

2023-09-07 15:58:53 UTC

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oh calculator not clock 🤦‍♂️

2023-09-07 15:08:45 UTC

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hey, go here:
https://mempool.space/clock/
fwiw there's a small clock icon on the graphs page (https://mempool.space/graphs) if you find that easier

2023-09-04 16:21:26 UTC

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You can observe many transactions being broadcast with lowball fees well below that required to enter the next block, increasing the unconfirmed transaction count but not affecting the fee rate

2023-09-04 16:03:46 UTC

Recent median fee rates are below 20 sat/vB despite the presence of over 557,000 unconfirmed transactions in our mempool.
https://cdn.nostr.build/i/416f29ccfae07fc1c5ce26b862d0090f98fd7f35b62897c1243853e55f15a6be.jpg

2023-09-04 15:50:41 UTC

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👀

2023-08-18 14:59:08 UTC

TAPSIGNER incoming 👀
https://cdn.nostr.build/i/89773ea599be140ce15fa3b00992424366cabae06c8ee924e922766c8c1300f7.jpg

2023-08-13 04:48:52 UTC

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https://cdn.nostr.build/i/316eaff28c36b14c5ea772e416c2a9dbaa7ca7d9bd3f8af14344b09d6d2a772e.gif

2023-08-01 14:06:29 UTC

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update: sorry fam...sadly, the mempool maintainers didn't see us eye-to-eye on this
https://github.com/mempool/mempool/pull/3927

2023-07-25 09:04:34 UTC

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🫂

2023-07-24 05:49:02 UTC

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thanks for asking...that was a bit unclear. romanz/electrs and fulcrum will still be supported. we meant that blockstream/esplora won't be supported anymore, which only affects big production deployments.

2023-07-24 03:41:46 UTC

🟧🟧8️⃣0️⃣0️⃣0️⃣0️⃣0️⃣ 🟪🟪🟪

2023-07-23 23:59:50 UTC

We’re working on major improvements to The Mempool Open Source Project as part of our upcoming v3.0 release.
Here are some of them, which are already live on mempool.space
---
1/
We’ve re-implemented our block template algorithm in Rust for improved accuracy and performance.
Before:
https://cdn.nostr.build/i/356310639d551a28dd5cc095998f0b7908a8ac51a6def2034ff0a010da910942.jpg
After:
https://cdn.nostr.build/i/99057a966a6a242e575d2798ae47c38b426fdc34ea17787da56bc6e9eb517a88.jpg
---
2/
We’ve begun visualizing both `mempoolfullrbf=0` and `mempoolfullrbf=1` transactions together
on our RBF timeline.
https://cdn.nostr.build/i/8ec67f9356538adf21f33b4c6e13111fe783fdf8cab3380d68aa8a04caf60e36.jpg
---
3/
We’ve forked blockstream/electrs to mempool/electrs and made many fixes and improvements.
(it's a breaking change -- mempool/mempool 3.x will require mempool/electrs 3.x)
https://github.com/mempool/electrs
---
4/
We’ve started integrating Mempool Accelerator™
https://cdn.nostr.build/i/97d168edb1b22b3bd5a7e2a269c32650e892aa030030862f9ef2bc317675ebef.jpg
---
5/
We now display and index P2PK outputs using their public keys.
Here's the first Bitcoin transaction from Satoshi to Hal Finney:
https://mempool.space/address/04ae1a62fe09c5f51b13905f07f06b99a2f7159b2225f374cd378d71302fa28414e7aab37397f554a7df5f142c21c1b7303b8a0626f1baded5c72a704f7e6cd84c
https://cdn.nostr.build/i/504f685819b63ee75ef6bfd10da24e6adc0abc79e64dfe9cdac0d9be45a41580.jpg
---
6/
We’ve made mempool blocks scrollable (most useful on mobile)
https://cdn.nostr.build/i/e3495a165600dcc5230bc1d46ecb67b50a90c0e5af4d792dfd34eae16497ca6c.gif
---
7/
We’ve imported historical mempool data from 2017 and 2018, thanks to a contribution from Jochen Hoenicke (https://jochen-hoenicke.de/queue/#BTC,all,weight).
https://cdn.nostr.build/i/bb25299d8f6e07cea8695572c92a48d26ba09186fcb787f37d2e66a832da9542.jpg
---
8/
There's more coming for the full 3.0 release, stay tuned!

2023-07-17 13:12:02 UTC

Tick tock, next block...
https://nostr.build/i/736a901642a079f3c785ce33da6998e7f4387fd7e6f91eabf53119c9f2ce8df7.gif
https://mempool.space/clock/mempool/0

2023-07-07 13:59:20 UTC

If you needed another reason to read/subscribe to the excellent Bitcoin Optech Newsletter...glozow and murch have been contributing a series on mempool policy for the past few weeks.
Part 8 came out this week.
Each written part of the series is accompanied by a discussion on the Bitcoin Optech Podcast.
https://bitcoinops.org/en/newsletters/2023/07/05/

2023-07-05 21:28:04 UTC

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👌

2023-07-05 19:51:28 UTC

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from dork ostrich to nerd ostrich, not bad...a contender

2023-07-05 19:19:25 UTC

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🫡
would prefer a less dorky looking ostrich icon though haha

2023-07-05 14:46:37 UTC

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good point, we should set that up

2023-07-05 14:11:51 UTC

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it sounds like you're concerned mempools might clear again

2023-07-05 13:41:48 UTC

Something about single-digit fees, green blocks, and posting about it all on nostr...feels good, wagmi
https://nostr.build/i/e7247aa1fe07f7daa3d79dca34d92277865aff4fe1c55ba18fc22820324b35a0.jpg

2023-07-01 17:45:18 UTC

Trusted third parties are usability holes

2023-04-21 17:12:05 UTC

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Will be an epic time at #[1]!
Sign up if you haven't already 🔥
#[0]

2023-04-05 23:44:18 UTC

Mempool v2.5.0 is now available on #[0]!!
Update now to get your very own self-hosted Lightning explorer!
Also included: mined block visualization, historical fiat prices, updated search bar, and much more.
⚡⚡
https://i.imgur.com/9dF0Yeh.jpg

2023-03-28 15:02:45 UTC

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Full release notes here.
https://github.com/mempool/mempool/releases/tag/v2.5.0

2023-03-28 15:02:00 UTC

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Now it’s up to our friends at Umbrel, Start9, RaspiBlitz, myNode, RoninDojo, and Citadel to make it available on their Raspberry Pi full-nodes distros.

2023-03-28 15:01:05 UTC

We just released v2.5.0 of the Mempool Open Source Project 🚀
This makes it possible for self-hosted Mempool instances to take advantage of the new features that we’ve released on mempool.space over the past few months.

2023-01-13 09:58:11 UTC

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We’re getting closer to our v2.5 release every day, but it’s complicated because of the new optional lightning node functionality. We should have updated Docker images published and an upgrade for Umbrel users within the next Two Weeks(tm), otherwise if you’re reckless feel free to upgrade your local instance to our master branch now 🤙

2023-01-06 10:13:56 UTC

🤙

2023-01-06 10:03:06 UTC

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https://youtu.be/hFIF61INmQs

2022-12-26 13:28:55 UTC

It’s important to run your own @mempool node for security, privacy, and freedom: if mempool.space goes down you won't be affected if you run your own instance. We support one-click installation on Umbrel, Raspiblitz, Start9, and more https://bitcointv.com/w/gfCk3QqmtJrULZNwc2fRuU

2022-12-26 13:25:57 UTC

It’s important to run your own
@mempool
node for security, privacy, and freedom: if mempool.space goes down you won't be affected if you run your own instance. We support one-click installation on Umbrel, Raspiblitz, Start9, and more https://bitcointv.com/w/gfCk3QqmtJrULZNwc2fRuU

2022-12-18 23:57:00 UTC

trusted third parties are security holes