The Evolution of Embedding Metadata in Blockchain Transactions

TL;DR

This paper analyzes how blockchain transactions increasingly embed metadata, highlighting its growth, applications, and implications for privacy and security, with a focus on Bitcoin as a case study.

Contribution

It classifies and empirically examines the evolution of embedded metadata in blockchain transactions, emphasizing privacy concerns and potential for misuse.

Findings

Metadata usage has significantly increased over recent years.

Embedding metadata is crucial for both legitimate applications and privacy enhancement.

There is a need for improved measures to prevent criminal abuse of blockchain metadata.

Abstract

The use of blockchains is growing every day, and their utility has greatly expanded from sending and receiving crypto-coins to smart-contracts and decentralized autonomous organizations. Modern blockchains underpin a variety of applications: from designing a global identity to improving satellite connectivity. In our research we look at the ability of blockchains to store metadata in an increasing volume of transactions and with evolving focus of utilization. We further show that basic approaches to improving blockchain privacy also rely on embedding metadata. This paper identifies and classifies real-life blockchain transactions embedding metadata of a number of major protocols running essentially over the bitcoin blockchain. The empirical analysis here presents the evolution of metadata utilization in the recent years, and the discussion suggests steps towards preventing criminal use. Metadata are relevant to any blockchain, and our analysis considers primarily bitcoin as a case study. The paper concludes that simultaneously with both expanding legitimate utilization of embedded metadata and expanding blockchain functionality, the applied research on improving anonymity and security must also attempt to protect against blockchain abuse.