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Made changes to ch05.asciidoc

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myarbrough@oreilly.com 2014-11-18 08:06:24 -08:00
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1 changed files with 5 additions and 2 deletions
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@ -530,6 +530,7 @@ This entire script can instead be represented by a 20-byte cryptographic hash, b
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A P2SH transaction locks the output to this hash instead of the longer script, using the locking script:
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OP_HASH160 54c557e07dde5bb6cb791c7a540e0a4796f5e97e OP_EQUAL
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@ -540,17 +541,19 @@ which, as you can see, is much shorter. Instead of "pay to this 5-key multi-sign
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The two scripts are combined in two stages. First, the redeem script is checked against the locking script to make sure the hash matches:
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<2 PK1 PK2 PK3 PK4 PK5 5 OP_CHECKMULTISIG> OP_HASH160 <redeem scriptHash> OP_EQUAL
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If the redeem script hash matches, the unlocking script is executed on its own, to unlock the redeem script:
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<Sig1> <Sig2> 2 PK1 PK2 PK3 PK4 PK5 5 OP_CHECKMULTISIG
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===== Pay-to-Script-Hash addresses
===== Pay-to-script-hash addresses
((("addresses, bitcoin","encrypting with P2SH")))((("Pay-to-Script-Hash (P2SH)","addresses")))Another important part of the P2SH feature is the ability to encode a script hash as an address, as defined in BIP0013. P2SH addresses are Base58Check encodings of the 20-byte hash of a script, just like bitcoin addresses are Base58Check encodings of the 20-byte hash of a public key. P2SH addresses use the version prefix "5", which results in Base58Check encoded addresses that start with a "3". For example, Mohammed's complex script, hashed and Base58Check-encoded as P2SH address becomes +39RF6JqABiHdYHkfChV6USGMe6Nsr66Gzw+. Now, Mohammed can give this "address" to his customers and they can use almost any bitcoin wallet to make a simple payment, as if it were a bitcoin address. The 3 prefix gives them a hint that this is a special type of address, one corresponding to a script instead of a public key, but otherwise it works in exactly the same way as a payment to a bitcoin address.
((("addresses, bitcoin","encrypting with P2SH")))((("Pay-to-script-hash (P2SH)","addresses")))Another important part of the P2SH feature is the ability to encode a script hash as an address, as defined in BIP0013. P2SH addresses are Base58Check encodings of the 20-byte hash of a script, just like bitcoin addresses are Base58Check encodings of the 20-byte hash of a public key. P2SH addresses use the version prefix "5", which results in Base58Check encoded addresses that start with a "3". For example, Mohammed's complex script, hashed and Base58Check-encoded as P2SH address becomes +39RF6JqABiHdYHkfChV6USGMe6Nsr66Gzw+. Now, Mohammed can give this "address" to his customers and they can use almost any bitcoin wallet to make a simple payment, as if it were a bitcoin address. The 3 prefix gives them a hint that this is a special type of address, one corresponding to a script instead of a public key, but otherwise it works in exactly the same way as a payment to a bitcoin address.
P2SH addresses hide all of the complexity, so that the person making a payment does not see the script.