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Better P2SH example with bx

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Andreas M. Antonopoulos 2018-02-03 15:36:44 -06:00
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@ -180,7 +180,19 @@ Almost all the scripts described in this chapter can only be implemented as P2SH
==== P2SH Addresses
((("scripting", "Pay-to-Script-Hash", "addresses")))((("Pay-to-Script-Hash (P2SH)", "addresses")))((("bitcoin improvement proposals", "Address Format for P2SH (BIP-13)")))Another important part of the P2SH feature is the ability to encode a script hash as an address, as defined in BIP-13. 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 a 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.
((("scripting", "Pay-to-Script-Hash", "addresses")))((("Pay-to-Script-Hash (P2SH)", "addresses")))((("bitcoin improvement proposals", "Address Format for P2SH (BIP-13)")))Another important part of the P2SH feature is the ability to encode a script hash as an address, as defined in BIP-13. 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 a P2SH address, becomes +39RF6JqABiHdYHkfChV6USGMe6Nsr66Gzw+. We can confirm that with the +bx+ command:
----
echo \
'54c557e07dde5bb6cb791c7a540e0a4796f5e97e'\
| bx address-encode -v 5
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.