Does bitcoin have a central server?

[kioicoin]

Recently in the study of p2p communication technology, NAT found holes, that is, through a variety of gateways, routers, firewalls, to ensure P2P to establish a connection, you need a central server. Does Bitcoin have a hub server? If there is a central server is not safe, the country a direct blow to seal ip dead. Really out of the center server p2p technology?

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 ;)In theory, bitcoin has no central server. In practice, however, bitcoin software often obtains a list of peer nodes through DNS Seed, allowing users to quickly discover peer nodes that are hardcoded in the btc core.

[chocolaty]

No, it does not have. Bitcoin does not rely on a central server or issuer to store funds or accomplish transactions. It primarily depends on peer-to-peer network. Transactions pass through number of nodes to be confirmed and verified. This is what makes digital currency unique.

[hgkcoin]

In theory, bitcoin has no central server.
In practice, however, bitcoin software often obtains a list of peer nodes through DNS Seed, allowing users to quickly discover peer nodes. Since the DNS server can provide you with some fixed malicious or invalid nodes, it is theoretically possible that this will be exploited, but as far as I know, Bitcoin has not seen such an attack yet. Fortunately, using DNS Seed is not the only way of establishing a peer-to-peer connection. For example, you can specify your DNS address yourself or violently enumerate IP addresses to establish a peer-to-peer connection.