“Contract Law and the State of Nature” by Anthony T. Kronman (1985). The Journal of Law, Economics, and Organization, Volume 1, Issue 1, SPRING 1985, Pages 5–32. A great introduction to mechanisms of contract enforcement outside the state.

Rules for a Flat World: Why Humans Invented Law and How to Reinvent It for a Complex Global Economy by Gillian K. Hadfield (2016)
https://www.goodreads.com/book/show/29587067-rules-for-a-flat-world

Assurance Contracts: mechanisms for incentivizing the creation of public goods.
https://en.wikipedia.org/wiki/Assurance_contract

Dominant Assurance Contracts
https://www.cato-unbound.org/2017/06/07/alex-tabarrok/making-markets-work-better-dominant-assurance-contracts-some-other-helpful

Agoric’s Electronic Rights Protocol (ERTP). How cryptocurrencies and digital assets are minted on Agoric’s platform.
https://agoric.com/documentation/ertp/guide/
https://github.com/Agoric/ERTP

Agoric’s Zoe framework for smart contracts:
https://agoric.com/documentation/zoe/guide/
https://github.com/Agoric/ERTP/tree/master/core/zoe

The Mystery of Capital: Why Capitalism Triumphs in the West and Fails Everywhere Else
by Hernando de Soto https://www.goodreads.com/book/show/86154.The_Mystery_of_Capital

The Digital Path by Mark S. Miller and Marc Stiegler (2003). A paper on how smart contracts can be used for property title, pre-Bitcoin.
https://agoric.com/assets/pdf/papers/digital-path.pdf

Finding The Greedy, Prodigal, and Suicidal Contracts at Scale  (2018) https://arxiv.org/pdf/1802.06038.pdf
Great paper that characterizes a number of problems that smart contracts can have, and how common they are. They used symbolic execution to search through nearly a million contracts for indicators of various problems.