BLOXHUBSubmit a challenge
For European city officials

Your urban challenge does not have a solution problem. It has a co-responsibility problem.

The model — C³

So we built C³.

A BLOXHUB model for co-responsibility.

  1. C¹

    Curate

    Select the specific public, private, civic and academic actors the challenge needs.

  2. C²

    Co-create

    Get them working as one set — shared definition, transparent incentives, joint risk.

  3. C³

    Co-respond

    The network stays accountable to each other long after we leave.

Explore the thinking behind co-responsibility
The model applies across —

A Just TransitionThe Value of Thriving CitiesA Resilient Europe

Explore the model
ACTOR FIELD
The C³ method, performed

Watch the field compose itself into a constellation.

01 — The disconnected field

All the capability already exists. None of it is connected.

Around your challenge sit the people who could move it: regulators, financiers, residents, researchers, developers. They exist in your city today. They are simply scattered across four sectors that rarely meet in the same room with the same intent.

02 — C¹ Curating

We know which actors belong in the room.

Out of a noisy field, BLOXHUB selects the specific public, private, civic and academic actors whose mandates, capital and knowledge are required to move this challenge. This is the institutional muscle that nobody else has — and the curation usually includes at least one actor nobody expected.

Including the actor nobody expected.
03 — C² Co-creation

We get them working as one set.

BLOXHUB facilitates the curated actors into a working constellation: shared problem definition, transparent incentives, co-designed solutions, jointly held risk. The links between them become real.

04 — C³ Co-responsibility

The links hold after we leave.

The network becomes accountable to each other — not to BLOXHUB. The constellation stays connected past the project, so the next decision, the next funding round, the next crisis is met by an alliance that already exists.

That was the method. Next — the method, performed.

Two cities. Two constellations being curated right now.

Scroll on to see what curated co-responsibility looks like in practice — one challenge, one constellation, at a time.

Case 01HafenCity, Hamburg
Case 02Tacoma, Washington
Keep scrolling
Co-responsibility in action

Two cities. One method, calibrated to each.

Each case is an urban challenge being solved by curating the missing constellation of actors. Choose a city to explore the work.

Pick a city to begin

The payoff

Co-responsibility is what your challenge is missing. Let BLOXHUB convene it.

Submit your urban challenge. We respond within five working days with an initial read on which sectors and actor types your city likely needs — and propose a call.

  • → Specific to your city, not generic advice
  • → Confidential. Not shared beyond BLOXHUB's programme team
  • → No commitment to engage — the call is exploratory

By submitting, you agree BLOXHUB may contact you about this challenge. We don't share your details with third parties.