$ umask 277; no=0; tmp=`mktemp -d -p ~/tmp/`; chmod 700 ${tmp}; while true;do no=$(($no + 1)); ssh-keygen -t ed25519 -f ${tmp}/${no} -N '' -C '' > /dev/null; grep -i -E m[a@]t[o0] ${tmp}/${no}.pub && echo ${tmp}/${no} && break; done
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOt6L8+9eF3T8o/M4BnDVZ5F7SVdPmat0hlM8s/8zV/r
/home/matoken/tmp/tmp.rGb5eSpEaJ/26016

$ git clone https://github.com/ionathanch/ssh-keygen-ed25519-vanity
$ cd ssh-keygen-ed25519-vanity
$ make

$ ./vanity mato
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEHmibZNyKuT/GO9rloS8qmatoFOZ4N7fJcRSOPCwsky
-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZWQyNTUxOQAAACBB5om2Tcirk/xjva5aEvKpmraBTmeDe3yXEUjjwsLJMgAAAIjwyswa8MrMGgAAAAtzc2gtZWQyNTUxOQAAACBB5om2Tcirk/xjva5aEvKpmraBTmeDe3yXEUjjwsLJMgA
AAEBro42f/ycDTNvMw3JHIGD5dzg+VVgshQw+RWIhN/I2WEHmibZNyKuT/GO9rloS8qmatoFOZ4N7fJcRSOPCwskyAAAAAAECAwQF
-----END OPENSSH PRIVATE KEY-----

$ time parallel -n 0 ./vanity vanity -- 1 2 3 4

$ go install github.com/pcarrier/vanity-keygen@latest
$ vanity-keygen -h
Usage of vanity-keygen:
  -cpuprofile string
        write cpu profile to file
  -threads int
        number of threads to run (default 4)

$ time vanity-keygen -threads `nproc` [mM][aA@][tT][oO0]
2023/04/05 08:30:06 Looking for a public key matching [mM][aA@][tT][oO0]
2023/04/05 08:30:06 Public key:
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIA2rzJZSoqwrVF/Pf2FzKgfL/eMATOI/V7bjdmqkGV5B
2023/04/05 08:30:06 Private key:
-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtz
c2gtZWQyNTUxOQAAACANq8yWUqKsK1Rfz39hcyoHy/3jAEziP1e243ZqpBleQQAA
AIiaywRCmssEQgAAAAtzc2gtZWQyNTUxOQAAACANq8yWUqKsK1Rfz39hcyoHy/3j
AEziP1e243ZqpBleQQAAAEDBsKpzquKe0/QTheaoVSChK8gF6d38u5mwrtqihfMY
6A2rzJZSoqwrVF/Pf2FzKgfL/eMATOI/V7bjdmqkGV5BAAAAAAECAwQF
-----END OPENSSH PRIVATE KEY-----

real    0m0.331s
user    0m0.652s
sys     0m0.048s

$ vanity-keygen aaaaa
2023/04/05 08:30:12 Looking for a public key matching aaaaa
2023/04/05 08:30:13 Generated 71,000 keypairs (69,788 Hz)
2023/04/05 08:30:14 Generated 141,000 keypairs (70,310 Hz)
2023/04/05 08:30:15 Generated 212,000 keypairs (70,454 Hz)
2023/04/05 08:30:16 Generated 284,000 keypairs (70,792 Hz)
2023/04/05 08:30:17 Generated 356,000 keypairs (71,040 Hz)

$ GOARCH=arm GOARM=7 go build .
$ file ./vanity-keygen
./vanity-keygen: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, Go BuildID=Z_Cr4XM48GAIHSA-MQng/2wFeSpgr5k0WPASNS4ho/3FEwAtva33LS2ByXLcjP/0WSk_fEc6xXCDZEo89yH, with debug_info, not stripped

$ ./vanity-keygen -threads 4 aaaa
2023/04/05 08:22:58 Looking for a public key matching aaaa
2023/04/05 08:22:59 Generated 0 keypairs (0 Hz)
2023/04/05 08:23:00 Generated 4,000 keypairs (1,991 Hz)
2023/04/05 08:23:01 Generated 4,000 keypairs (1,332 Hz)
2023/04/05 08:23:02 Generated 8,000 keypairs (1,990 Hz)
2023/04/05 08:23:03 Generated 8,000 keypairs (1,598 Hz)
^C
$ cat /proc/device-tree/model && echo
Raspberry Pi 3 Model B Rev 1.2

$ ssh-keygen -p -f ./key
Key has comment ''
Enter new passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved with the new passphrase.

$ ssh-keygen -c -f ./key
Enter passphrase:
Old comment:
New comment: vanity
Comment 'vanity' applied

$ cpu-info
Packages:
        0: Intel Core i5-7300U
Microarchitectures:
        2x Sky Lake
Cores:
        0: 2 processors (0-1), Intel Sky Lake
        1: 2 processors (2-3), Intel Sky Lake
Logical processors (System ID):
        0 (0): APIC ID 0x00000000
        1 (2): APIC ID 0x00000001
        2 (1): APIC ID 0x00000002
        3 (3): APIC ID 0x00000003
$ lsb_release -dr
No LSB modules are available.
Description:    Debian GNU/Linux 12 (bookworm)
Release:        12
$ arch
x86_64

$ cargo install rana
    Updating crates.io index
  Installing rana v0.5.1
  Downloaded is-terminal v0.4.4
  Downloaded clap_lex v0.3.2
  Downloaded syn v1.0.109
  Downloaded bip39 v1.2.0
  Downloaded 4 crates (346.5 KB) in 2.86s
error: failed to compile `rana v0.5.1`, intermediate artifacts can be found at `/tmp/cargo-installvCF9z2`

Caused by:
  package `clap_derive v4.1.0` cannot be built because it requires rustc 1.64.0 or newer, while the currently active rustc version is 1.63.0
  Try re-running cargo install with `--locked`
$ dpkg-query -W rustc
rustc   1.63.0+dfsg1-2

$ script ./nostr_vanity.log
$ docker run --rm -it rust
# rustc --version
rustc 1.67.1 (d5a82bbd2 2023-02-07)
# adduser matoken
# su - matoken
$ export PATH=/usr/local/cargo/bin:$PATH
$ rustup default stable
$ cargo install rana
$ rana --help
Rana 🐸

      o  o
     ( -- )
  /\( ,   ,)/\
^^   ^^  ^^   ^^

A simple CLI to generate nostr vanity addresses

Francisco Calderón <negrunch@grunch.dev>

Usage: rana [OPTIONS]

Options:
  -d, --difficulty <DIFFICULTY>
          Enter the number of starting bits that should be 0. [default: 0]
  -v, --vanity <VANITY_PREFIX>
          Enter the prefix your public key should have when expressed
          as hexadecimal. [default: ]
  -n, --vanity-n-prefix <VANITY_NPUB_PREFIXES_RAW_INPUT>
          Enter the prefix your public key should have when expressed
          in npub format (Bech32 encoding). Specify multiple vanity
          targets as a comma-separated list. [default: ]
  -s, --vanity-n-suffix <VANITY_NPUB_SUFFIXES_RAW_INPUT>
          Enter the suffix your public key should have when expressed
          in npub format (Bech32 encoding). Specify multiple vanity
          targets as a comma-separated list. [default: ]
  -c, --cores <NUM_CORES>
          Number of processor cores to use [default: 4]
  -r, --restore <MNEMONIC>
          Restore from mnemonic to public private key [default: ]
  -g, --generate <WORD_COUNT>
          Generate mnemonic using wordcount. Should be 12,18 or 24 [default: 0]
  -p, --passphrase <MNEMONIC_PASSPHRASE>
          Passphrase used for restoring mnemonic to keypair [default: ]
  -q, --qr
          Print QR code of the private key
  -h, --help
          Print help
  -V, --version
          Print version

$ rana --vanity-n-prefix matok
thread 'main' panicked at 'The vanity npub prefix can only contain characters supported by Bech32: 023456789acdefghjklmnpqrstuvwxyz', /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/rana-0.5.1/src/cli.rs:146:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

$ rana --vanity-n-prefix mat0k | tee rana.log
Started mining process for vanity bech32 prefix[es]: 'npub1["mat0k"]' (estimated pow: 20)
Benchmarking of cores disabled for vanity npub key upon proper calculation.
Mining using 4 cores...

$ rana --vanity-n-prefix mat0k | tee rana.log
Started mining process for vanity bech32 prefix[es]: 'npub1["mat0k"]' (estimated pow: 20)
Benchmarking of cores disabled for vanity npub key upon proper calculation.
Mining using 4 cores...
<<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>>
Vanity npub found:         mat0k
Found matching Nostr public key:
Hex public key:   df56fb6cce5a60eac0a55b09ff6d5fbb565b07da6f64a2578ae827d70a21873b
Hex private key:  7a1a088022c3110fabc445af28681c0d2c349a2123f38fe83fbc809d7c8ed6bb
Npub public key:  npub1mat0kmxwtfsw4s99tvyl7m2lhdt9kp76daj2y4u2aqnawz3psuass9qwnz
Nsec private key: nsec10gdq3qpzcvgsl27ygkhjs6qup5krfx3py0ecl6plhjqf6lyw66as4gyfat
26169409 iterations (about 2x10^7 hashes) in 3199 seconds. Avg rate 8180 hashes/second