TLDR
The State of Blockchain Interoperability in 2020 [An Overview] read by Rafael Belchior PhD researcher (Blockchain) The paper states "In this category, we identify and define different strategies for chain interoperability across public blockchains, most of them implementing cryptocurrencies" The criteria that we used to classify each solution follows Buterin’s classification: sidechain (or relay chain) approaches, notary schemes and timed hash-locks. It is worth pointing out that most research available (especially Blockchain Connectors) are very recent (since 2017, being the majority dated from 2019).via the TL;DR App
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Written by rafaelbelchior | PhD researcher (Blockchain);
https://rafaelapb.github.io/
