A brief history of the brief history of ordinal inscriptions (https://insights.glassnode.com/the-week-onchain-week-07-2023) on bitcoin from glassnode Another introduction to ordinals (https://blog.bitgo.com/the-rise-of-ordinal-inscriptions-dbe7cb0336c6) from crypto company Bitgo Bitcoin developer Andrew Poelstra on why banning arbitrary data (https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2023-January/021372.html) from the bitcoin blockchain isn't feasible The Ordinal docs (https://docs.ordinals.com) The introductory doc to BRC-20 (https://domo-2.gitbook.io/brc-20-experiment) experiment which uses ordinals to create altcoins on bitcoin Brandon Black's github (https://github.com/brandonblack)