Privately issued IOUs and privately minted coins are covered here in part (i) of the series. These IOUs can more specifically be described as bearer promissory notes, and even more specifically, when issued by banks, bank notes.
The Bitcoin public blockchain implements a global settlement layer ("layer 1" in bitcoin parlance). The closest historical analog to the Bitcoin settlement layer is not to the bank notes, nor even to the coins (despite its name), it is to the monetary metal that for most of monetary history from ancient civilization to the 20th century ultimately underlay the IOUs. This "metal layer" of historical money systems will be covered in part (ii) of this series, as will some even more ancient forms of non-governmental money.
Higher layers of the bitcoin ecosystem, which can include exchanges (centralized or decentralized) as well as more trust-minimized systems such as Lightning, correspond most closely in our rough historical analogies to checking accounts (which, although often counted by economists as part of the money supply, and not created or managed by governments, will be so familiar to most readers that they will not be covered in this series) and to private bank notes. In these higher layer monetary systems, a more computationally (or for bank notes physically) efficient medium is substituted for a less efficient medium (for bank notes, often the underlying metal), usually (as is the case with checking accounts, bank notes, and centralized bitcoin exchanges alike) at the cost of increasing trust and thus vulnerability and risk in the system.
|Bank note (bearer promissory instrument) issued by the North of Scotland Bank, 1945. Many banks besides central banks have issued bank notes that circulated as currency. George Selgin and Lawrence White among others have done extensive work in this area. Knowledge of the long history of non-governmental money was one of the inspirations of the original invention of trust-minimized cryptocurrency. This practice continues to this day in Hong Kong and Scotland.
|Bank of Prince Edward Island note, Canada, 1871
|Mechanic’s Bank note of 1856, Augusta, Georgia. Before our Civil War, most paper money in the United States was privately issued.
|Boone County Bank note, Lebanon, Indiana 1858. "During this era the U.S. had no central bank and paper money was issued by a variety of private banks. Some was even issued by manufacturing and retail companies. This money was backed by gold, silver, real estate, stocks, bonds, and a wide variety of other assets. You can no longer cash them in, but they are now worth often substantial sums as collectibles...the note designs were more varied and creative than modern money, and were remarkably free of politicians' faces." Source
|Hagerstown Bank note, Hagerstown, Missouri, 1850s (this instance unissued). Some other scholars within the Federal Reserve remembered the private note-issuing era in the United States; their central bankers' view of it can be found here.
|Jiaozi, a bearer promissory note
from the Song Dynasty. The earliest jiaozi were issued in Sichuan province by
merchants to relieve their fellow merchants of the high costs of transporting
the heavy government-issued iron coins.
Gordon Tullock wrote of bearer promissory notes in an earlier time and different part of China,
|A brass half-penny issued by grocer Edward Nightingale, probably dating from the early 1670s. [Source] While in most times and places, coinage was a royal or otherwise political monopoly, there were a number of important exceptions where coins were minted privately and successfully circulated as currency. Per monetary historian Glyn Davies, during the English Commonwealth, Protectorate, and early Restoration occurred “a vast issue by merchants, manufacturers, and municipalities, between 1644 and 1672, of copper tokens, mostly of farthings and halfpence.” [Davies p243]
|Anglesey & Mines druid half-penny, England, 1788. "From 1787 to 1797, private merchants and industrialists issued 600 tons of custom-made 'commercial' copper coin, which was more copper coin than the Royal Mint had supplied during the previous half century." [Source].
In part (ii) of this series we will explain and give a few examples of the monetary metals themselves, usually mined and processed by private entities. For most of monetary history, from ancient civilization until recent times, the monetary metals were the ultimate "O" in the IOUs -- the substances that bearer promissory notes were most often redeemed for -- and constituted the most common contents of the coins themselves. The various forms into which monetary metals could be shaped, including coins, were sampled and assayed for their metal content when used outside of the locale where they were issued or covered by legal tender laws.
Part (ii) will also explain why these metals, not any of their particular forms, are the closest analog we have to Bitcoin in monetary history. Finally, we will cover some the many other forms besides coins that these metals could take, the monetary and quasi-monetary functions of these forms, and get some glimpses of even more ancient forms that were the common ancestors of modern money and modern jewelry. Part 2 can only scratch the surface of this vast topic and will refer the reader to more in-depth works including those of this author.