# Substituting Proof of Work in Blockchain with Training-Verified Collaborative Model Computation

arXiv: https://arxiv.org/abs/2508.12138 · HTML: https://mlsanity.com/paper/2508.12138/

## Key facts

- No citing papers in the map yet (data through 14 Oct 2026).
- Builds on 5 of its 19 references that are in the map.
- First posted on arXiv 16 Aug 2025.

## Builds on (most cited first, 5 of 5)

- [Scaling Laws for Neural Language Models](https://mlsanity.com/paper/2001.08361/) (2020)
- [Experiments on Parallel Training of Deep Neural Network using Model Averaging](https://mlsanity.com/paper/1507.01239/) (2015)
- [GPU Asynchronous Stochastic Gradient Descent to Speed Up Neural Network Training](https://mlsanity.com/paper/1312.6186/) (2013)
- [Beyond Gradient Averaging in Parallel Optimization: Improved Robustness through Gradient Agreement Filtering](https://mlsanity.com/paper/2412.18052/) (2024)
- [Stochastic Gradient Descent on Highly-Parallel Architectures](https://mlsanity.com/paper/1802.08800/) (2018)

## Abstract (arXiv)

Bitcoin's Proof of Work (PoW) mechanism, while central to achieving decentralized consensus, has long been criticized for excessive energy use and hardware inefficiencies citedevries2018bitcoin, truby2018decarbonizing. This paper introduces a hybrid architecture that replaces Bitcoin's traditional PoW with a centralized, cloud-based collaborative training framework. In this model, miners contribute computing resources to train segments of horizontally scaled machine learning models on preprocessed datasets, ensuring privacy and generating meaningful outputs citeli2017securing. A central server evaluates contributions using two metrics: number of parameters trained and reduction in model loss during each cycle. At the end of every cycle, a weighted lottery selects the winning miner, who receives a digitally signed certificate. This certificate serves as a verifiable substitute for PoW and grants the right to append a block to the blockchain citenakamoto2008bitcoin. By integrating digital signatures and SHA-256 hashing citenist2015sha, the system preserves blockchain integrity while redirecting energy toward productive computation. The proposed approach addresses the sustainability concerns of traditional mining by converting resource expenditure into socially valuable work, aligning security incentives with real-world computational progress.