Sebastian Falbesoner theStack
theStack
/ bip352_scanning_approaches.txt
Last active
December 4, 2025 18:43
Different approaches for scanning in Silent Payments (BIP-352)
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| Different approaches for scanning in Silent Payments (BIP-352) | |
| ============================================================================================= | |
| ===== "calculate label candidates for each tx output, look them up in the labels cache" ===== | |
| ============================================================================================= | |
| The current approach for scanning in secp #1765 is as follows, following BIP-352: | |
| For each k value, derive the unlabeled output candidate P_k, then loop over the | |
| transaction x-only outputs linearly to check whether there is either a unlabeled or a | |
| labeled match. For the latter, two label candidates are calculated for each transaction |
theStack
/ secp_pr1767_bench_results.txt
Created
November 7, 2025 20:30
Benchmark results for secp PR #1767 on my arm64 notebook (Lenovo Thinkpad T14s Gen 6, with a Qualcomm Snapdragon X Elite CPU)
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| $ cc --version | head -1 | |
| cc (Ubuntu 14.2.0-19ubuntu2) 14.2.0 | |
| $ lscpu | head -3 | |
| Architecture: aarch64 | |
| CPU op-mode(s): 64-bit | |
| Byte Order: Little Endian | |
| $ uname -a | |
| Linux thestack-ThinkPad-T14s-Gen-6 6.17.0-8-qcom-x1e #8-Ubuntu SMP PREEMPT_DYNAMIC Sun Aug 31 21:03:54 UTC 2025 aarch64 aarch64 aarch64 GNU/Linux | |
| ===== Baseline ===== |
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| #!/usr/bin/env bash | |
| set -e | |
| git checkout master | |
| git fetch upstream pull/1767/head:pr1767 | |
| git checkout pr1767 | |
| build_bench_at_commit() { | |
| local commit=$1 | |
| local suffix=$2 |
theStack
/ secp256k1-proto-extract.txt
Last active
February 18, 2025 01:36
Extract secp256k1proto from bip-frost-dkg repository with history using git-filter-repo
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| $ git clone https://github.com/BlockstreamResearch/bip-frost-dkg secp256k1proto-extract-history | |
| $ cd secp256k1proto-extract-history | |
| $ git filter-repo --path-rename reference/secp256k1ref:python/secp256k1proto | |
| $ git filter-repo --path-rename python/secp256k1ref:python/secp256k1proto | |
| $ git filter-repo --path python/secp256k1proto | |
| $ git filter-repo --path-rename python/secp256k1proto:src/secp256k1proto | |
| $ uv init --package --lib --name secp256k1proto --python 3.11 | |
| $ git add . && git commit -m 'initialized package via "uv init"' | |
| $ git remote add origin https://github.com/theStack/secp256k1proto-playground | |
| $ git push origin master:with_history2 |
theStack
/ gist:0893258c3aba91c28539b9334d2e0608
Created
October 19, 2024 13:22
considerations for a possible secp256k1 hazmat module
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| considerations for a possible secp256k1 hazmat module | |
| - exposed data types | |
| * as discussed at coredev lisbon: provide scalar and point types in the | |
| first version, field element type can still be added later if needed | |
| * responsibility for allocating space for the types? | |
| the PoC secp-zkp pr #153 [1] provides a function _scalar_size and forces | |
| the user to allocate dynamic memory, which seems not ideal, especially | |
| in embedded systems where malloc usage is often strongly discouraged | |
| (or not even possible); it seems better to know the size already at |
theStack
/ gist:d5e40876d6a60bb423c5379ad6d24911
Last active
March 27, 2024 14:44
PR28970 review notes
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| summary for #28970: | |
| let's assume we have a 1p1c-package consisting of low-feerate parent tx_p | |
| and high-feerate child tx_c. a node receives this package in form of two | |
| single tx messages, tx_p and then tx_c. | |
| to my current understanding, the following happens on this receiving node: | |
| on master: |
theStack
/ gist:b41884e31ebc5cdca3220bcaa674cb70
Created
February 18, 2024 01:36
Bitcoin depends BDB build fail on OpenBSD
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| configure:6211: checking whether C++ supports the ISO C++ standard includes | |
| configure:6231: clang++ -m64 -c -pipe -std=c++20 -O2 -I/home/thestack/bitcoin/depends/amd64-unknown-openbsd7.4/include -D_XOPEN_SOURCE=600 conftest.cpp >&5 | |
| In file included from conftest.cpp:10: | |
| In file included from /usr/include/c++/v1/iostream:37: | |
| In file included from /usr/include/c++/v1/ios:214: | |
| In file included from /usr/include/c++/v1/__locale:37: | |
| In file included from /usr/include/c++/v1/__support/openbsd/xlocale.h:13: | |
| /usr/include/c++/v1/__support/xlocale/__strtonum_fallback.h:23:64: error: unknown type name 'locale_t' | |
| char **endptr, locale_t) { | |
| ^ |
theStack
/ arm_32bit_qemu.txt
Last active
November 22, 2023 15:15
Running Bitcoin Core on an emulated 32-bit ARM system using qemu
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| # Running Bitcoin Core on an emulated 32-bit ARM system using qemu (for reproducing issue #28906 and testing the fix PR #28913) | |
| # guide based on https://translatedcode.wordpress.com/2016/11/03/installing-debian-on-qemus-32-bit-arm-virt-board/ | |
| # tested on Ubuntu 22.04 LTS | |
| $ sudo apt-get install qemu-system-arm libguestfs-tools | |
| $ wget -O installer-vmlinuz http://http.us.debian.org/debian/dists/bookworm/main/installer-armhf/current/images/netboot/vmlinuz | |
| $ wget -O installer-initrd.gz http://http.us.debian.org/debian/dists/bookworm/main/installer-armhf/current/images/netboot/initrd.gz | |
| $ qemu-img create -f qcow2 myarmdisk.qcow2 80G | |
| $ qemu-system-arm -M virt -m 2048 -kernel installer-vmlinuz -initrd installer-initrd.gz \ | |
| -drive if=none,file=myarmdisk.qcow2,format=qcow2,id=hd \ |
theStack
/ check_pr28008.py
Last active
July 27, 2023 01:27
Verify test vectors of #28008 by using PyCryptodome (and implementing FSChaCha20{Poly1305,}, BIP324Cipher)
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| #!/usr/bin/env python3 | |
| from Crypto.Cipher import ChaCha20, ChaCha20_Poly1305 | |
| def nonce_bytes(nonce32, nonce64): | |
| return nonce32.to_bytes(4, 'little') + nonce64.to_bytes(8, 'little') | |
| ############################################################################################# | |
| ### PR #28008, commit 2/8 "crypto: add the ChaCha20Poly1305 AEAD as specified in RFC8439" ### | |
| ############################################################################################# | |
| def test_chacha20poly1305(plain, aad, key, nonce96, cipher_with_tag_expected): |
theStack
/ utreexo_readme_example.go
Created
April 14, 2023 12:44
utreexo README.md example, corrected
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| package main | |
| import ( | |
| "crypto/sha256" | |
| "fmt" | |
| "github.com/utreexo/utreexo" | |
| "os" | |
| ) | |
| func main() { |
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