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be converted to a public registration with the name_firstupdate command, by sup‐ plying the random key: $ namecoind name_firstupdate d/mastering-bitcoin a05555e0fc56c023 "{"map": {"www": {"ip":"1.2.3.4" b7a2e59c0a26e5e2664948946ebeca1260985c2f616ba579e6bc7f35ec234b01 The example above will map the domain name www.mastering-bitcoin.bit to IP ad‐ dress 1.2.3.4. The hash returned is the transaction id that can be used to track this registration. You can see what names are registered to you by running the name_list command: $ namecoind name_list [ { } ] Namecoin registrations need to be updated every 36,000 blocks (approximately 200 to 250 days). The name_update command has no fee and therefore renewing domains in Namecoin is free. Third party providers can handle registration, automatic renewal and updating via a web interface, for a small fee. With a third-party provider you avoid the need to run a namecoin client, but you lose the independent control of a de-centralized name registry offered by Namecoin. Bitmessage Bitmessage is a bitcoin alt-chain that implements a de-centralized secure messaging service, essentially a server-less encrypted email system. Bitmessage allows users to compose and send messages to each other, using a bitmessage address. The messages operate in much the same way as a bitcoin transaction, but they are transient - they do not persist beyond 2 days and if not delivered to the destination node in that time, they are lost. Senders and recipients are pseudonymous, they have no identifiers other than a bitmessage address, but are strongly authenticated, meaning that messages cannot be “spoofed”. Bitmessages are encrypted to the recipient and therefore the bitmessage net‐ work is resistant to holistic surveillance - an eavesdropper has to compromise the re‐ cipient’s device in order to intercept messages. Ethereum Ethereum is a Turing-complete contract processing and execution platform based on a blockchain ledger. It is not a clone of bitcoin, but a completely independent design and implementation. Ethereum has a built-in currency, called ether, which is required in "name" : "d/mastering-bitcoin", "value" : "{map: {www: {ip:1.2.3.4}}}}", "address" : "NCccBXrRUahAGrisBA1BLPWQfSrups8Geh", "expires_in" : 35929 232 | Chapter 9: Alternative Chains, Currencies, and ApplicationsPDF Image | Mastering Bitcoin
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