Version 0.20.11+:
```
# test a similar set of commands on locally-generated source package
ninja package_source
VERSION="0.20.11"
KEYS_FILE="bitcoin-abc-${VERSION}/contrib/gitian-signing/keys.txt"
# tweaked the line below since no release currently contains keys.txt
tar -zxOf <build-dir>/bitcoin-abc-0.20.11.tar.gz "${KEYS_FILE}" | while read FINGERPRINT _; do gpg --recv-keys "${FINGERPRINT}"; done
```
Earlier versions:
1. Download any number of binaries from https://download.bitcoinabc.org/0.20.9/<platform>
2. Download signature files from https://download.bitcoinabc.org/0.20.9/
3. Follow the second set of instructions for earlier versions.