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Government · head to head

Bidnet Direct vs Cosign

Bidnet Direct logo

Bidnet Direct

Government

Regional bid notification network where agencies post free and suppliers pay for alerts

From
On request
Free plan
No
Full reviewWebsite
Cosign logo

Cosign

Cybersecurity

Signs and verifies container images and artifacts, with or without managing keys

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only Cosign has a free tier, so it costs nothing to try first.
  • Each has a real cost: Bidnet Direct suppliers pay for aggregation, not access: the same solicitations are generally published free on individual agency and state portals, so the subscription is only worth it if searching manually costs more than the fee.; Cosign keyless signing inherits every weakness of the identity provider behind it. Sigstore’s own threat model states that if an identity provider is compromised, Sigstore will issue certificates to those identities, so a compromised account produces perfectly valid signatures.
  • They diverge on capability: Bidnet Direct covers Regional purchasing groups, Cosign covers Keyless signing.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Bidnet Direct and Cosign actually diverge.

Attributes where Bidnet Direct and Cosign differ
AttributeBidnet DirectCosign
Starting priceOn requestFree
Pricing modelquoteOpen source, no licence fee
Free tierNoYes
PlatformsWebmacOS, Linux, Windows, Docker
CategoryGovernmentCybersecurity

Identical on both: user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Bidnet Direct

  • Regional purchasing groups
  • Free agency publication
  • Supplier notification
  • Vendor registration
  • Bid document distribution
  • Award postings
  • Supplier diversity reporting

Only in Cosign

  • Keyless signing
  • Key and KMS signing
  • Registry-native storage
  • In-toto attestations
  • Offline verification
  • Trusted root and signing config

What people use each for

The jobs each tool is most often brought in to do.

Bidnet Direct

  • A small municipal purchasing department that needs competitive responses without building or paying for its own bid portalnot Cosign
  • A contractor that wants notification of every relevant solicitation across a state rather than checking dozens of agency websitesnot Cosign
  • A state cooperative wanting a single regional portal so suppliers register once for many agenciesnot Cosign
  • An agency required to demonstrate outreach to certified diverse suppliers on every solicitationnot Cosign

Cosign

  • Signing container images in a build pipeline without managing long-lived private keysnot Bidnet Direct
  • Attaching a signed bill of materials to a release so consumers can verify its provenancenot Bidnet Direct
  • Meeting a customer or regulatory requirement for signed artifactsnot Bidnet Direct
  • Verifying third-party images before they enter an internal registrynot Bidnet Direct

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Bidnet Direct

  • Suppliers pay for aggregation, not access: the same solicitations are generally published free on individual agency and state portals, so the subscription is only worth it if searching manually costs more than the fee.
  • Supplier pricing is not published and varies by geography and category breadth, which makes it difficult for a small contractor to judge value before a sales conversation.
  • Category matching produces a high volume of irrelevant alerts for suppliers whose work does not map neatly onto procurement commodity codes, so the notification stream needs constant tuning.
  • Bidnet is now one brand inside SOVRA, which divested six business units in 2025 under new private equity ownership, so portfolio priorities can change independently of any individual product's customers.
  • For agencies it is a publication and notification network rather than a sourcing system: bid evaluation, scoring and contract management need a separate tool.

Cosign

  • Keyless signing inherits every weakness of the identity provider behind it. Sigstore’s own threat model states that if an identity provider is compromised, Sigstore will issue certificates to those identities, so a compromised account produces perfectly valid signatures.
  • A signature proves who signed, never whether they should have. The documentation is explicit that Sigstore cannot determine authorisation, so every consumer must write and maintain their own identity and issuer policy or verification means nothing.
  • Nothing is enforced without an admission controller. Signing changes what you can prove, not what runs, and the official policy controller has a small maintainer base for a component sitting in a cluster admission path.
  • Upgrades break pipelines. Version 3 changed defaults, version 4 is announced as removing legacy functionality and roughly half the command line flags, and two official client libraries still lacked support for the new log format as of mid 2026.
  • Signatures do not expire. An artifact signed before a maintainer account was compromised and one signed after are indistinguishable unless somebody is actively monitoring the transparency log, and almost nobody is.

Pricing, plan by plan

Bidnet Direct

On request
  • Supplier subscription$undefined/year
    • Matched opportunity notifications
    • Access to regional purchasing group solicitations
    • Priced by geographic and category coverage
  • Agency participation$undefined/year
    • Solicitation publication and vendor registry
    • Free or low cost to participating public agencies
    • Supplier diversity reporting

Cosign

Free
  • CosignFree
    • Apache-2.0
    • Public Sigstore infrastructure free to use
    • No usage limits published

Which should you pick?

Choose Bidnet Direct if

  • You need regional purchasing groups.
  • You also want free agency publication.
Bidnet Direct review

Choose Cosign if

  • You need keyless signing.
  • You want to start without paying.
  • You work on macOS, Linux, Windows, Docker.
  • You also want key and kms signing.
Cosign review

Questions people ask

Is Bidnet Direct or Cosign better?
Neither clearly leads. Bidnet Direct starts at On request and Cosign at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Bidnet Direct or Cosign?
Cosign has a free tier; the other does not. Paid plans start at On request for Bidnet Direct and Free for Cosign.
Does Bidnet Direct or Cosign run on more platforms?
Bidnet Direct runs on Web. Cosign runs on macOS, Linux, Windows, Docker.
Can I use Cosign for free?
Yes. Cosign has a free tier, so you can try it without paying. Bidnet Direct starts at On request.
What is Bidnet Direct best used for?
Bidnet Direct is most often used for a small municipal purchasing department that needs competitive responses without building or paying for its own bid portal, a contractor that wants notification of every relevant solicitation across a state rather than checking dozens of agency websites, a state cooperative wanting a single regional portal so suppliers register once for many agencies, an agency required to demonstrate outreach to certified diverse suppliers on every solicitation. Of those, a small municipal purchasing department that needs competitive responses without building or paying for its own bid portal and a contractor that wants notification of every relevant solicitation across a state rather than checking dozens of agency websites are not what Cosign is typically brought in for.
What can Bidnet Direct do that Cosign cannot?
Bidnet Direct covers Regional purchasing groups, Free agency publication, Supplier notification, Vendor registration. Cosign covers Keyless signing, Key and KMS signing, Registry-native storage, In-toto attestations.

Answered from the vendors’ own pages

Bidnet Direct: Do government agencies pay?

Generally not, or very little. The network is funded by supplier subscriptions, which is why agencies get an existing supplier pool without paying for it.

Cosign: Does Cosign tell me if an image is vulnerable?

No. It has no vulnerability knowledge whatsoever. It can carry an SBOM as a signed attestation but never reads it. Pair it with a scanner.

Bidnet Direct: Is it worth it for a supplier?

Only if aggregation saves you more than it costs. The solicitations are public and available free elsewhere; you are buying alerting and search across many agencies at once.

Cosign: Is signing alone enough?

No. Verification is a command somebody runs. Without an admission controller enforcing it, an unsigned image still runs.

Bidnet Direct: Who owns it now?

SOVRA, the rebranded procurement business of mdf commerce, which was acquired by KKR. Bidnet Direct remains a named product within that portfolio.

Cosign: What does a bare cosign verify actually prove?

Very little. Without a pinned certificate identity and OIDC issuer, it accepts a valid signature from any identity at all.

Bidnet Direct: Does it evaluate bids?

No. It publishes and distributes. Scoring, evaluation and contract management require a sourcing platform.

Cosign: What is the risk of keyless signing?

Your OIDC provider becomes the root of trust. Compromise of that account yields genuine, verifiable signatures, so account security is the control that matters.

Cosign: Should we expect breaking changes?

Yes. Version 4 is announced to remove roughly half the flags, and a post-quantum migration is named as a further breaking change after that.

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