Contributions by @harding to devel docs

Thanks also (in alphabetical order) to @cbeams, @mikehearn, and
@tgeller, among others.

The last pre-squash commit was: c2b8d562aa107c7b68c60946cea14cdccc5159ad

_includes/ref_core_rpcs-uvwxyz.md

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+#### validateaddress
+
+~~~
+validateaddress <address>
+~~~
+
+{% autocrossref %}
+
+Return information about the given Bitcoin address.
+
+{% endautocrossref %}
+
+**Argument: An Address**
+
+{% autocrossref %}
+
+*String; required:* A Bitcoin address.
+
+{% endautocrossref %}
+
+**Result: Information About The Address**
+
+{% autocrossref %}
+
+A JSON object containing one or more values (the exact number depending
+on the information). The result of *isvalid* is always returned to
+indicated whether or not the address is valid. If it is valid, the
+validated *address* is returned plus *ismine* to indicate whether or not
+it belongs to this wallet and *account* to indicate which account it
+belongs to. If it's a P2SH address, *isscript* will be true. If it's a
+P2PH address, *pubkey* will contain the public key and *compressed* will
+indicate whether or not the pubkey/address is compressed.
+
+{% endautocrossref %}
+
+~~~
+{
+  "isvalid" : <true|false>,
+  "address" : "<address>",
+  "ismine" : <true|false>,
+  "isscript" : <true|false>,
+  "pubkey" : "<public key hex>",
+  "iscompressed" : <true|false>,
+  "account" : "<account>"
+}
+~~~
+
+**Example**
+
+{% autocrossref %}
+
+Validate the following address from the wallet:
+
+{% endautocrossref %}
+
+~~~
+> bitcoin-cli -testnet validateaddress mgnucj8nYqdrPFh2JfZSB1NmUThUGnmsqe
+~~~
+
+Result:
+
+~~~
+{
+    "isvalid" : true,
+    "address" : "mgnucj8nYqdrPFh2JfZSB1NmUThUGnmsqe",
+    "ismine" : true,
+    "isscript" : false,
+    "pubkey" : "03bacb84c6464a58b3e0a53cc0ba4cb3b82848cd7bed25a7724b3cc75d76c9c1ba",
+    "iscompressed" : true,
+    "account" : "test label"
+}
+~~~
+
+
+#### verifychain
+
+~~~
+verifychain [throughness] [blocks]
+~~~
+
+{% autocrossref %}
+
+Verify the local blockchain database.
+
+{% endautocrossref %}
+
+**Argument #1: Throughness**
+
+{% autocrossref %}
+
+*Number; optional:* how thoroughly to check the database, from 0 to 4
+with 4 being the most through. Defaults to 3. <!-- TODO: what does each
+level do? -->
+
+{% endautocrossref %}
+
+**Argument #2: Number Of Blocks To Check**
+
+{% autocrossref %}
+
+*Number; optional:* check this number of the most recent blocks.
+
+{% endautocrossref %}
+
+**Result: Verified Or Not**
+
+*True* if verified.
+
+**Example**
+
+{% autocrossref %}
+
+Verify the most recent 10,000 blocks in the most through way:
+
+{% endautocrossref %}
+
+~~~
+> bitcoin-cli -testnet verifychain 4 10000
+~~~
+
+Result (took 25 seconds on a generic PC laptop):
+
+~~~
+true
+~~~
+
+
+
+
+
+#### verifymessage
+
+~~~
+verifymessage <address> <signature> <message>
+~~~
+
+{% autocrossref %}
+
+Verify a signed message.
+
+{% endautocrossref %}
+
+**Argument #1: The Address**
+
+{% autocrossref %}
+
+*String; required:* the address corresponding to the private key used to
+create the signature.
+
+{% endautocrossref %}
+
+**Argument #2: The Signature**
+
+{% autocrossref %}
+
+*String; required:* the signature provided in the same base64 format
+generated by `signmessage`.
+
+{% endautocrossref %}
+
+**Argument #3: The Message**
+
+{% autocrossref %}
+
+*String; required:* the exact message which was signed.
+
+{% endautocrossref %}
+
+**Result: True Or False**
+
+{% autocrossref %}
+
+*True* if the message provided was signed by the private key corresponding to the
+address provided.
+
+{% endautocrossref %}
+
+**Example**
+
+{% autocrossref %}
+
+Check the signature on the message created in the example for
+`signmessage`:
+
+{% endautocrossref %}
+
+~~~
+> bitcoin-cli -testnet verifymessage \
+    mgnucj8nYqdrPFh2JfZSB1NmUThUGnmsqe \
+    IOGreqb/7UgD1ifcojESd32ZJgH5RGzUXitmbl6ZbdenSmitipWoLSi73TskmLY7zhcD662bTw3RHoYQl/dOAhE= \
+    'Hello, World!'
+~~~
+
+Result:
+
+~~~
+true
+~~~
+
+
+#### walletlock
+
+~~~
+walletlock
+~~~
+
+{% autocrossref %}
+Removes the wallet encryption key from memory, locking the wallet. After
+calling this method, you will need to call `walletpassphrase` again before
+being able to call any methods which require the wallet to be unlocked.
+{% endautocrossref %}
+
+
+**Return**
+
+No return printed on success.
+
+**Example**
+
+~~~
+> bitcoin-cli -testnet walletlock
+~~~
+
+(Success: nothing printed.)
+
+
+#### walletpassphrase
+
+walletpassphrase <passphrase> <seconds>
+
+{% autocrossref %}
+Stores the wallet decryption key in memory for the indicated number of
+seconds. Issuing the `walletpassphrase` command while the wallet is
+already unlocked will set a new unlock time that overrides the old one.
+{% endautocrossref %}
+
+**Argument #1: The Passphrase**
+
+{% autocrossref %}
+*String; required:* the passphrase to unlock the encrypted wallet.
+{% endautocrossref %}
+
+**Argument #2: The Number Of Seconds To Leave The Wallet Unlocked**
+
+{% autocrossref %}
+*Number; required:* The number of seconds after which the decryption key
+will be automatically deleted from memory.
+{% endautocrossref %}
+
+**Result**
+
+No result printed on success.
+
+**Example**
+
+{% autocrossref %}
+Unlock the wallet for 10 minutes (the passphrase is "test"):
+{% endautocrossref %}
+
+~~~
+> bitcoin-cli -testnet walletpassphrase test 600
+~~~
+
+(Success: no result printed.)
+
+
+
+#### walletpassphrasechange
+
+~~~
+walletpassphrasechange <old passphrase> <new passphrase>
+~~~
+
+{% autocrossref %}
+Changes the wallet passphrase from 'old passphrase' to 'new passphrase'.
+{% endautocrossref %}
+
+**Argument #1: The Old Passphrase**
+
+*String; required:* the current passphrase.
+
+**Argument #2: The New Passphrase**
+
+*String; required:* the new passphrase.
+
+**Result**
+
+No result printed on success.
+
+**Example**
+
+Change the wallet passphrase from "test" to "example":
+
+~~~
+> bitcoin-cli -testnet walletpassphrasechange test example
+~~~
+
+(Success: no result printed.)
+