April 2020
Intermediate to advanced
244 pages
7h 20m
English
Content preview from Securing Blockchain Networks like Ethereum and Hyperledger Fabric
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Peer discovery in Bitcoin
At startup, each node must connect to at least one active peer on the network. After consulting the list of hardcoded IP addresses, or following the query of DNS seeds, the node is able to establish a connection with at least one other peer node. This connection is established through the TCP protocol by contacting port 8333 of the peer if the connection is established on the Bitcoin mainnet, or port 18333 in the case of the Bitcoin testnet. Once the connection is established, the handshake phase takes place, during which the nodes exchange the version message containing the updated information on the network (such as the version number, IP addresses, and the height of the blockchain).
At this point, with the information ...
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