  Blockchain interoperability is a prominent research field which aims to build
bridges between otherwise isolated blockchains. With advances in cryptography,
novel protocols are published by academia and applied in different applications
and products in the industry. In theory, these innovative protocols provide
strong privacy and security guarantees by including formal proofs. However,
pure theoretical work often lacks the perspective of real world applications.
In this work, we describe a number of hardly researched problems which
developers encounter when building cross-chain products.
