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How to authenticate binary downloads

The PointSav private distribution endpoint at software.pointsav.com issues Ed25519-signed binary releases. Every download is verified against the publisher's public key before the binary executes. This guide covers requesting a licence token, downloading a release, and verifying the signature.

For the architecture behind the distribution system, see private-git-paid-customer-endpoint and software-distribution-substrate.

Before you begin

You need:

A verified account at software.pointsav.com
An active licence for the product you are downloading
A Linux or macOS host with curl installed

Step 1: Obtain your licence token

Log in to software.pointsav.com and navigate to Licences. Each active licence displays an Ed25519-signed token in the format psv1_<product>_<ulid>.<signature>. Copy the full token string.

The token encodes the product identifier, expiry date, and a cryptographic binding to your account key. The distribution endpoint returns 401 for an expired token and 403 if the token does not cover the requested product.

Step 2: Download the release archive

Pass the licence token as a bearer credential in the download request:

curl -fsSL \
  -H "Authorization: Bearer <your-licence-token>" \
  "https://software.pointsav.com/releases/<product>/<version>/linux-x86_64.tar.gz" \
  -o release.tar.gz

Replace <product> and <version> with the values shown on the Releases page for your licence. Available platforms appear alongside each release.

Step 3: Fetch the detached signature

Each release archive has an accompanying .sig file signed with the publisher's Ed25519 private key:

curl -fsSL \
  -H "Authorization: Bearer <your-licence-token>" \
  "https://software.pointsav.com/releases/<product>/<version>/linux-x86_64.tar.gz.sig" \
  -o release.tar.gz.sig

Step 4: Import the publisher's public key

The signing key is pinned at a well-known path on the distribution endpoint:

curl -fsSL \
  "https://software.pointsav.com/.well-known/pointsav-signing-key.pub" \
  -o pointsav-signing-key.pub

Confirm the key fingerprint matches the value listed in the release notes for the version you are downloading before proceeding to verification.

Step 5: Verify the Ed25519 signature

Create an allowed-signers file and run ssh-keygen -Y verify:

echo "releases@pointsav.com $(cat pointsav-signing-key.pub)" > allowed_signers

ssh-keygen -Y verify \
  -f allowed_signers \
  -I releases@pointsav.com \
  -n release \
  -s release.tar.gz.sig \
  < release.tar.gz

A successful verification prints: Good "release" signature for releases@pointsav.com

If the command prints Signature verification failed, the archive has been modified in transit or the signature file does not match the archive. Do not proceed — re-download both files and verify again before use.

Step 6: Extract and run the binary

tar -xzf release.tar.gz
chmod +x <product>
./<product> --version

The binary validates its licence token at startup. If the token has expired since the download, the process exits with a message indicating the specific expiry date. Renew the token at software.pointsav.com and restart.

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