Why Must Banks Rebuild Controls for Every Blockchain?

jays8088 writes: Moving assets between blockchains is an interoperability problem. Must an institution also rebuild its governance on each network? In my SSRN paper, I propose separating institutional authority from transaction execution. Risk systems, compliance services, custodians, and human approvers would produce verifiable authorizations that asset contracts could check across networks. The aim is to preserve institutional control as the underlying technology changes. The hard questions are how authorization is scoped, revoked, kept current, and prevented from being reused. Can portable authority help solve a problem that cross-chain bridges alone leave untouched?