# Ruhrkraft Demo - Blockchain-based Advertising Time Tracking for Disinfectant Dispensers

> The Ruhrkraft Demo combines hygiene with digital marketing through intelligent disinfectant dispensers with integrated screens. The system detects approaching persons and plays targeted advertising videos during hand disinfection, with playback automatically stopping when the person leaves the area. Smart contracts transparently document the actually played advertising time and enable fair billing only for truly viewed advertisements.

**Sector:** Tertiary sector · **Industry:** PR and marketing agencies · **Organisation:** Blockchain Reallabor · **Maturity level:** Concept

Canonical URL: https://www.sapientblock.com/en/use-cases/blockchain-reallabor-energiemarketing-blockchain-demonstrieren

## Documentation status

- **Project status:** Concept
- **Evidence:** Evidence medium
- **Editorial review:** Ufuk Avci, 15 April 2026

## Description

The Blockchain Reallabor Huerth developed the Ruhrkraft demo as an interactive demonstrator for blockchain-based energy concepts. Ruhrkraft is a regional energy provider that relies on decentralised blockchain energy solutions.

The problem for the energy sector in blockchain communication: decentralised energy concepts (peer-to-peer trading, smart contracts for energy billing, tokenised energy units) are difficult for the average consumer to understand. Marketing material alone is insufficient. The Ruhrkraft demo solves this with tangible technology: visitors and potential customers can see live on a touchscreen or tablet how an energy transaction between two parties takes place on the blockchain — from feed-in via a PV system to billing the consumer. The Blockchain Reallabor Huerth (euronova CAMPUS Studio 6) serves as a demonstration centre where energy suppliers and other companies can make their blockchain concepts tangible. Ruhrkraft is documented in the Blockchain Reallabor portfolio as a practical example for the energy sector.

## Benefits

- Companies only pay for advertising that is actually seen and can precisely measure their marketing ROI.
- Users receive improved hygiene options with time-limited, relevant advertising.
- The transparent blockchain-based billing creates trust between advertisers and operators.
- The combination of hygiene and marketing opens up new revenue streams for operators of public spaces.
- Precise measurability of advertising effectiveness enables data-driven campaign optimisation.
- Marketing teams receive reliable data for campaign evaluation and can work on a success basis.

## Challenges

- Companies need to adapt their advertising strategies to the new precise measurability.
- The integration of hardware components with blockchain infrastructure requires technical expertise.
- Acceptance of the technology among users and advertising partners must first be established.
- Staff require training to manage the intelligent hygiene marketing systems.

## Technology foundation

The system uses smart contracts for automated and tamper-proof recording of advertising times at disinfectant dispensers. Blockchain technology ensures transparent billing between advertisers and operators, as all interactions are immutably documented.

## Sources

- [Ruhrkraft Demo - Blockchain Reallabor](https://blockchain-reallabor.de/portfolio-item/ruhrkraft-demo/)