Protocols used in a distributed/dlt system for the nodes to establish communication

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What is the underlying protocol used by the nodes to establish initial communication within each other in distributed/distributed ledger technology?

For instance: Cassandra uses TCP to learn about other nodes.

Likewise, what protocol is used by

Bitcoin - ?
Ethereum - ?
Hashgraph - TCP?

I am not sure if this question too broad to address. Please give some pointes to get answers to this questions.

Thanks
Aug 6, 2018 in Blockchain by charlie_brown
• 7,720 points
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1 answer to this question.

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yes all are over TCP/IP connections secured by TLS encryption in hashgraph architecture-hashgraph, `wiki-etherum-netwroking , lightning-is-bitcoins-tcp-ip

answered Aug 6, 2018 by ariaholic
• 7,340 points

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