FAME marketplace smart-contract evaluation data

Dataset supporting the article "Blockchain and Tokenization Based Federated Data Marketplace" (submitted to Open Research Europe). It contains the per-run Ethereum gas-consumption measurements behind the average gas-cost figures reported in the paper, together with the script used to generate them. Contents: papertests.js — Node.js script that executes test cases T1–T4 and measures gas usage of the FAME marketplace smart contracts (offering creation and purchase functions for the Subscription, Pay-As-You-Go, and Pay-As-You-Use models). Usage: node papertests.js <T> <payment>, where <T> is 1–4 and <payment> is PAYG, PAYU, or Subscription. results-T1-*.json, results-T2-*.json — test results obtained on a local Geth node (v1.14.12-stable, development mode). results-T3-*.json, results-T4-*.json — test results obtained on a local Hardhat node. Test cases scale the number of data providers, assets, offers, users, and purchases (T1: 5 providers/50 users up to T4: 50 providers/2000 users) to evaluate whether smart-contract gas costs remain stable as transaction volume grows.