SWIFT
The Society for Worldwide Interbank Financial Telecommunication, founded in 1973 — a secure messaging system banks use to instruct each other about payments. SWIFT does not hold, transfer, or clear money itself; it is closer to a highly secure, standardized postal service for payment instructions, with the actual movement of money happening through correspondent banking. Excluding a country's banks from SWIFT is a serious blow (removing the fast, cheap, universally trusted standard) without being an absolute technical barrier, since excluded banks can still communicate through slower, more expensive alternatives.
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