feat: update Bitcoin Core to v31.1

scripts/_functions.bitcoincore.sh

@@ -15,7 +15,7 @@ fi
 function downloadBitcoinCore() {
   # set version
   # https://bitcoincore.org/en/download/
-  bitcoinVersion="29.2"
+  bitcoinVersion="31.1"
 
   if bitcoin-cli --version | grep $bitcoinVersion >/dev/null; then
     echo "# Bitcoin Core $bitcoinVersion is already installed"

tests/README.md

@@ -9,6 +9,8 @@ file recursively - **to add tests, just drop a new `.bats` file here**, no CI
 change needed.
 
 Current coverage:
+- `bitcoin-core-version.bats` - pinned Bitcoin Core release, signed manifest
+  URLs, supported Linux artifact matrix, and verification ordering
 - `repository-contracts.bats` - syntax checks for every maintained shell and
   Python script, systemd unit structure, and safe config-parser adoption
 - `source-conf.bats` - safe parsing of config data, quoting, malformed lines,

tests/bitcoin-core-version.bats

@@ -0,0 +1,27 @@
+#!/usr/bin/env bats
+
+SCRIPT="$BATS_TEST_DIRNAME/../scripts/_functions.bitcoincore.sh"
+
+@test "standalone installer pins Bitcoin Core 31.1" {
+  grep -Fq 'bitcoinVersion="31.1"' "$SCRIPT"
+  ! grep -Fq 'bitcoinVersion="29.2"' "$SCRIPT"
+}
+
+@test "release downloads use the pinned version for signed manifests and binaries" {
+  grep -Fq 'bitcoin-core-${bitcoinVersion}/SHA256SUMS' "$SCRIPT"
+  grep -Fq 'bitcoin-core-${bitcoinVersion}/SHA256SUMS.asc' "$SCRIPT"
+  grep -Fq 'bitcoin-core-${bitcoinVersion}/${binaryName}' "$SCRIPT"
+  grep -Fq 'binaryName="bitcoin-${bitcoinVersion}-${bitcoinOSversion}.tar.gz"' "$SCRIPT"
+}
+
+@test "all v31.1 Linux architectures published upstream remain mapped" {
+  grep -Fq 'bitcoinOSversion="arm-linux-gnueabihf"' "$SCRIPT"
+  grep -Fq 'bitcoinOSversion="aarch64-linux-gnu"' "$SCRIPT"
+  grep -Fq 'bitcoinOSversion="x86_64-linux-gnu"' "$SCRIPT"
+}
+
+@test "signature verification precedes binary checksum acceptance" {
+  signature_line="$(grep -n 'gpg --verify SHA256SUMS.asc' "$SCRIPT" | head -n1 | cut -d: -f1)"
+  checksum_line="$(grep -n 'binaryChecksum=' "$SCRIPT" | head -n1 | cut -d: -f1)"
+  [ "$signature_line" -lt "$checksum_line" ]
+}