All: remove references to blockchain.info

They changed to blockchain.com and now heavily promote alcoins.

Suggested by Murchandamus and Roasbeef

appdx-pycoin.asciidoc

@@ -330,7 +330,7 @@ Dogecoin address : DFpN6QqFfUm3gKNaxN6tNcab1FArL9cZLE
 ==== Transaction Utility (TX)
 
 ((("transaction utility (TX)", id="TX17")))
-The command-line utility +tx+ will display transactions in human-readable form, fetch base transactions from pycoin's transaction cache or from web services (blockchain.info, blockcypher.com, blockr.io and chain.so are currently supported), merge transactions, add or delete inputs or outputs, and sign transactions.
+The command-line utility +tx+ will display transactions in human-readable form, fetch base transactions from pycoin's transaction cache or from web services (blockcypher.com, blockr.io and chain.so are currently supported), merge transactions, add or delete inputs or outputs, and sign transactions.
 
 Following are some examples.
 
@@ -358,7 +358,7 @@ Oops! We don't have web services set up. Let's do that now:
 [source,bash]
 ----
 $ PYCOIN_CACHE_DIR=~/.pycoin_cache
-$ PYCOIN_BTC_PROVIDERS="block.io blockchain.info blockexplorer.com"
+$ PYCOIN_BTC_PROVIDERS="block.io blockexplorer.com"
 $ export PYCOIN_CACHE_DIR PYCOIN_BTC_PROVIDERS
 ----
 

ch02.asciidoc

@@ -36,7 +36,7 @@ relationships and flows between them.
 .Bitcoin overview
 image::images/mbc2_0201.png["Bitcoin Overview"]
 
-((("Bitcoin Block Explorer")))((("BlockCypher Explorer")))((("blockchain.info")))((("BitPay Insight")))Popular blockchain explorers include:
+((("Bitcoin Block Explorer")))Popular blockchain explorers include:
 
 * https://blockstream.info/[Blockstream Explorer]
 * https://mempool.space[Mempool.Space]

ch09.asciidoc

@@ -217,7 +217,7 @@ The following identifier hash belongs to the genesis block:
 ----
 
 You can search for that block hash in any block explorer website, such
-as _blockchain.info_, and you will find a page describing the contents
+as _blockstream.info_, and you will find a page describing the contents
 of this block, with a URL containing that hash:
 
 https://blockstream.info/block/000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f

code/get-utxo.py

@@ -1,31 +0,0 @@
-# get unspent outputs from blockchain API
-
-import json
-import requests
-
-# example address
-address = '1Dorian4RoXcnBv9hnQ4Y2C1an6NJ4UrjX'
-
-# The API URL is https://blockchain.info/unspent?active=<address>
-# It returns a JSON object with a list "unspent_outputs", containing UTXO, like this:
-# {	"unspent_outputs":[
-#   {
-#     "tx_hash":"ebadfaa92f1fd29e2fe296eda702c48bd11ffd52313e986e99ddad9084062167",
-#     "tx_index":51919767,
-#     "tx_output_n": 1,
-#     "script":"76a9148c7e252f8d64b0b6e313985915110fcfefcf4a2d88ac",
-#     "value": 8000000,
-#     "value_hex": "7a1200",
-#     "confirmations":28691
-#   },
-# ...
-# ]}
-
-resp = requests.get('https://blockchain.info/unspent?active=%s' % address)
-utxo_set = json.loads(resp.text)["unspent_outputs"]
-
-for utxo in utxo_set:
-    print("%s:%d - %ld Satoshis" % (utxo['tx_hash'], utxo['tx_output_n'],
-                                    utxo['value']))
-    # Or try...
-    # print("{tx_hash}:{tx_output_n} - {value} Satoshis".format(**utxo))

tools/discouraged.sh

@@ -41,3 +41,5 @@ m-of-m
 m-of-n
 n-of-n
 k-of-n
+blockchain.info
+blockchain.com