Post
Topic
Board Electrum
Merits 90 from 18 users
Topic OP
LoyceV's 0.1 sat/vbyte Electrum Server Adventure
by
LoyceV
on 13/08/2025, 14:37:50 UTC
⭐ Merited by Welsh (15) ,pooya87 (10) ,NeuroticFish (10) ,joker_josue (10) ,hosemary (8) ,dbshck (8) ,bitmover (8) ,hugeblack (7) ,Pmalek (4) ,TryNinja (2) ,Charles-Tim (1) ,BitMaxz (1) ,DireWolfM14 (1) ,stwenhao (1) ,nc50lc (1) ,khaled0111 (1) ,mikel_012 (1) ,Lucius (1)
I'm currently installing my very first Electrum server, and figured I'd start a topic to keep track of my progress.

Medusah's post 4 weeks ago pointed out that an increase number of Bitcoin miners lowered their minimum transaction fee from 1 to 0.1 sat/vbyte. Unfortunately, Electrum doesn't allow the user to set a fee lower than the connected Electrum server's minimum, which makes it much more compliated to use the lower fees.
My goal is to create the first Electrum server that allows this. I may or may not be running this long-term, by the time others join the lower fees I may stop it as it takes quite some disk space.
Note that some miners still prefer empty blocks over lower fees. Use mempool.space to see how likely your transaction is going to be included. If it takes too long to confirm: just switch to an Electrum server that doesn't accept low-fee transactions, and create a new transaction with higher fee.

My current VPS has 32 GB RAM, and enough NVMe storage for everything except for Bitcoin Core's blocks directory. That directory is on much slower network storage. I'll have to see how it performs on this hardware.
It turns out there are many different implementation of Electrum server. ABCbits's post made me choose Fulcrum.

Progress so far (summarized):
  • Create user "electrum"
  • Start and sync Bitcoin Core:
Code:
bitcoind -maxuploadtarget=400000 -dbcache=16384 -rpcuser=user -rpcpassword=pass -rpcport=number
  • Start Fulcrum:
Code:
~/Fulcrum-1.12.0-x86_64-linux/Fulcrum --datadir /path/datadir --bitcoind 127.0.0.1:number --rpcuser=user --rpcpassword=pass
  • Current status:
Code:
    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                                                                                                                         
  11626 electrum  20   0 3557636 797904   6272 S 257.1   2.4  74:04.61 Fulcrum                                                                                                                                         
   9573 electrum  20   0   16.7g   2.3g   1.8g S  13.0   7.4  12:07.91 bitcoind
Code:
[2025-08-13 16:26:45.772] <Controller> Processed height: 269000, 29.6%, 19.8 blocks/sec, 7035.7 txs/sec, 25674.4 addrs/sec
[2025-08-13 16:27:27.935] <Controller> Processed height: 270000, 29.7%, 23.7 blocks/sec, 7932.9 txs/sec, 27207.3 addrs/sec
[2025-08-13 16:28:44.932] <Controller> Processed height: 271000, 29.8%, 13.0 blocks/sec, 5863.4 txs/sec, 21324.5 addrs/sec
[2025-08-13 16:29:53.065] <Controller> Processed height: 272000, 29.9%, 14.7 blocks/sec, 6917.3 txs/sec, 23934.4 addrs/sec
[2025-08-13 16:30:39.111] <Controller> Processed height: 273000, 30.0%, 21.7 blocks/sec, 9363.9 txs/sec, 34043.5 addrs/sec
[2025-08-13 16:31:14.499] <Controller> Processed height: 274000, 30.1%, 28.3 blocks/sec, 10296.1 txs/sec, 39189.5 addrs/sec
[2025-08-13 16:31:50.110] <Controller> Processed height: 275000, 30.2%, 28.1 blocks/sec, 9665.8 txs/sec, 37819.0 addrs/sec

Now we wait Smiley To be continued Smiley

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