jamesob

-:  ---------- > 1:  608d8b4a62 rpc: move-only: consolidate blockchain scan args
1:  6a69dd267e ! 2:  d836ce3f2f Add scanblocks RPC call - scan for relevant blocks with descriptors
    @@ Metadata
     Author: Jonas Schnelli <dev@jonasschnelli.ch>
     
      ## Commit message ##
    -    Add scanblocks RPC call - scan for relevant blocks with descriptors
    +    rpc: add scanblocks - scan for relevant blocks with descriptors
    +
    +    Co-authored-by: James O'Beirne <james.obeirne@gmail.com>

jamesob

# This (very scant) guide allows you to do Android and react-native development on Linux by 
# running the android emulator in a container.

# install yay via AUR
git clone https://aur.archlinux.org/yay.git && cd yay && makpkg -si

# install all android dev packages per https://wiki.archlinux.org/title/Android
yay -Sy android-sdk-cmdline-tools-latest android-sdk-build-tools android-sdk-platform-tools android-platform 

# add to .zshrc

jamesob

Security

• no credentials kept in codebase
  • use consul/zookeeper/etc., then have code load credentials from environment variables
• using a bastion box to safeguard access to servers
  • in conjunction with, e.g., AWS security groups

Development

jamesob

$ make clean && ./configure && make clean && make && SECP256K1_BENCH_ITERS=200000 ./bench verify sign

Benchmark                     ,    Min(us)    ,    Avg(us)    ,    Max(us)

ecdsa_verify                  ,    71.5       ,    71.5       ,    71.5
ecdsa_sign                    ,    54.8       ,    54.9       ,    54.9
schnorrsig_sign               ,    41.9       ,    41.9       ,    41.9
schnorrsig_verify             ,    72.6       ,    72.6       ,    72.6

jamesob

1. Install Spotify in the usual way:

curl -fsSL https://download.spotify.com/debian/pubkey_5E3C45D7B312C643.gpg | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/spotify.gpg
sudo apt update && sudo apt install spotify-client

2. Compile stubs for X-specific calls that Spotify makes:

$ cat xstub.c

jamesob

// Open Inspect -> Console, copy-paste this in.

function load_all_gh_comments() {
  let buttons = Array.from(document.querySelectorAll('button'));
  let get_with_text = (text) => buttons.filter((b) => b.textContent.includes(text));
  let load_more_buttons = get_with_text("Load more");
  let nothing_loading = get_with_text("Loading…").length === 0;

  if (load_more_buttons.length === 0 && nothing_loading) { 
      console.log("done loading comments"); 

jamesob

OP_VAULT transaction examples

The following output was generated by the OP_VAULT functional test suite.

Normal spend, 1 input [NoRecoveryAuth]

Initialize (94 vB)

jamesob

In [17]: for h in HeaderToTipEvent.objects.order_by('-header_to_tip_secs')[:50]:
    ...:     print(f'{h.saw_header_at.date()}    {h.host.name:<14} {h.host.bitcoin_version:<24} headtotip = {h.header_to_tip_secs:<6.3f}s   headtoblock = {h.header_to_block_secs:<6.3f}s   blocktotip = {h.block_to_tip_secs:<6.3f}s   {h.blockhash} ({h.height})')
    ...:
2023-05-21    b-04.slug      25.0rc2                  headtotip = 67.749s   headtoblock = 65.571s   blocktotip = 2.178 s   00000000000000000004f0919e965cabf33b76f80ce8d69354edbdca5c7507bf (790720)
2023-05-19    b-04.slug      25.0rc2                  headtotip = 47.833s   headtoblock = 46.867s   blocktotip = 0.966 s   000000000000000000003c3aff2eb3e0022c2c9444acbf591db4cd25bfb91377 (790493)
2023-05-18    b-04.slug      25.0rc2                  headtotip = 36.867s   headtoblock = 36.725s   blocktotip = 0.142 s   000000000000000000007069e5b2d84598c731e6d6f4098c73cc2161c5f03f63 (790376)
2023-05-16    ssd-1.ccl      25.99.0-d7700d3a2647     headtotip = 31.581s   headto

jamesob

tx: https://mempool.space/tx/7bea4b346f6143dd824f8db8b739e93e414b29c2b2b9c06c9b2edf395e46fff9
block: https://mempool.space/block/000000000000000000003a3e1ed4bced6c52acb1a684d00607b00944e79ce3aa

10:12:34 james@tacoma src/bmon (?± master 3062ef8) % bmon-infra rg "(7bea4b346f6143dd824f8db8b739e93e414b29c2b2b9c06c9b2edf395e46fff9|000000000000000000003a3e1ed4bced6c52acb1a684d00607b00944e79ce3aa)"
10:13:00.149217 I fscm.remote: connecting to host bitcoin-01; may prompt for credentials
10:13:00.149566 I fscm.remote: connecting to host b-01.slug; may prompt for credentials
10:13:00.149942 I fscm.remote: connecting to host b-02.slug; may prompt for credentials
10:13:00.150279 I fscm.remote: connecting to host b-03.slug; may prompt for credentials
10:13:00.151181 I fscm.remote: connecting to host b-04.slug; may prompt for credentials
10:13:00.151781 I fscm.remote: connecting to host ssd-1.ccl; may prompt for credentials

jamesob

#11 114.6 /usr/bin/ld: libbitcoin_util.a(libbitcoin_util_a-settings.o): in function `util::ReadSettings(fs::path const&, std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, UniValue, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, UniValue> > >&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&)':
#11 114.6 /usr/include/c++/8/bits/fs_ops.h:121: undefined reference to `std::filesystem::status(std::filesystem::__cxx11::path const&)'
#11 114.6 collect2: error: ld returned 1 exit status