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@ -554,13 +554,13 @@ You might be
surprised to learn that there is more than one blockchain used with Bitcoin. The surprised to learn that there is more than one blockchain used with Bitcoin. The
"main" Bitcoin blockchain, the one created by Satoshi Nakamoto on "main" Bitcoin blockchain, the one created by Satoshi Nakamoto on
January 3rd, 2009, the one with the genesis block we studied in this January 3rd, 2009, the one with the genesis block we studied in this
chapter, is called _mainnet_. There are other Bitcoin blockchains that chapter, is ((("mainnet")))called _mainnet_. There are other Bitcoin blockchains that
are used for testing purposes: at this time _testnet_, _signet_, and are used for testing purposes: at this time _testnet_, _signet_, and
_regtest_. Let's look at each in turn. _regtest_. Let's look at each in turn.
==== Testnet: Bitcoin's Testing Playground ==== Testnet: Bitcoin's Testing Playground
Testnet is the name of the test blockchain, network, and currency that Testnet is ((("blockchain", "test blockchains", "testnet", id="blockchain-test-testnet")))((("test blockchains", "testnet", id="test-block-testnet")))((("testnet", id="testnet")))the name of the test blockchain, network, and currency that
is used for testing purposes. The testnet is a fully featured live P2P is used for testing purposes. The testnet is a fully featured live P2P
network, with wallets, test bitcoins (testnet coins), mining, and all network, with wallets, test bitcoins (testnet coins), mining, and all
the other features of mainnet. The most important difference is that the other features of mainnet. The most important difference is that
@ -661,7 +661,7 @@ incentive, at least in the short term. Because PoW mining is designed
to be permissionless, anyone can mine, whether their intention is good to be permissionless, anyone can mine, whether their intention is good
or not. That means disruptive miners can create many blocks in a row on or not. That means disruptive miners can create many blocks in a row on
testnet without including any user transactions. When those attacks testnet without including any user transactions. When those attacks
happen, testnet becomes unusable for users and developers. happen, testnet becomes unusable for users and ((("blockchain", "test blockchains", "testnet", startref="blockchain-test-testnet")))((("test blockchains", "testnet", startref="test-block-testnet")))((("testnet", startref="testnet")))developers.
==== Signet: The Proof of Authority Testnet ==== Signet: The Proof of Authority Testnet