removed the last of the 2e index tags

applications.adoc

@@ -968,8 +968,7 @@ know the secret +R+.
 [[lightning_network]]
 === Routed Payment Channels (Lightning Network)
 
-((("Lightning Network",
-"defined")))The Lightning Network is a proposed routed network of
+The Lightning Network is a proposed routed network of
 bidirectional payment channels connected end-to-end. A network like this
 can allow any participant to route a payment from channel to channel
 without trusting any of the intermediaries. The Lightning Network was

authorization-authentication.adoc

@@ -311,8 +311,7 @@ image::images/mbc2_0606.png["Tx_Script_P2PubKeyHash_2"]
 [[multisig]]
 === Scripted multisignatures
 
-((("multisignature
-scripts")))Multisignature scripts set a condition where _k_ public keys
+Multisignature scripts set a condition where _k_ public keys
 are recorded in the script and at least _t_ of those must provide
 signatures to spend the funds, called t-of-k.
 For example, a 2-of-3 multisignature is one
@@ -676,8 +675,7 @@ spent.
 [[op_return]]
 === Data Recording Output (OP_RETURN)
 
-((("blockchain (the)",
-"nonpayment data recording")))Bitcoin's
+Bitcoin's
 distributed and timestamped blockchain has potential uses
 beyond payments. Many developers have tried to use the transaction
 scripting language to take advantage of the security and resilience of
@@ -766,8 +764,7 @@ It is important to understand the limitations of transaction lock time. The only
 
 ==== Check Lock Time Verify (OP_CLTV)
 
-((("bitcoin improvement proposals",
-"OP_CHECKLOCKTIMEVERIFY (BIP65)")))In December 2015, a new form of
+In December 2015, a new form of
 timelock was introduced to Bitcoin as a soft fork upgrade. Based on a
 specification in BIP65, a new script operator called
 _OP_CHECKLOCKTIMEVERIFY_ (_CLTV_) was added to the scripting language.

bitcoin-core.adoc

@@ -1110,8 +1110,7 @@ spot the difference.
 [[alt_libraries]]
 === Alternative Clients, Libraries, and Toolkits
 
-((("toolkits, libraries, and clients",
-id="toolkit03")))There
+There
 are many alternative clients, libraries, toolkits, and even full-node
 implementations in the bitcoin ecosystem. These are implemented in a
 variety of programming languages, offering programmers native interfaces

fees.adoc

@@ -620,8 +620,7 @@ you intended.
 [[fee_sniping]]
 === Timelock Defense Against Fee Sniping
 
-((("security", "defense
-against fee-sniping")))Fee-sniping is a theoretical
+Fee-sniping is a theoretical
 attack scenario, where miners attempting to rewrite past blocks "snipe"
 higher-fee transactions from future blocks to maximize their
 profitability.

intro.adoc

@@ -140,8 +140,7 @@ authority_, represents a breakthrough in distributed computing.
 
 === Getting Started
 
-((("bitcoin", "getting started",
-id="BCbasic01")))Bitcoin is a protocol that can be accessed using an
+Bitcoin is a protocol that can be accessed using an
 application that speaks the protocol. A "Bitcoin wallet" is the
 most common user interface to the Bitcoin system, just like a web
 browser is the most common user interface for the HTTP protocol. There
@@ -407,8 +406,7 @@ Here are some methods for acquiring bitcoin as a new user:
 
 [TIP]
 ====
-((("digital currencies", "benefits of
-bitcoin")))One of the advantages of
+One of the advantages of
 Bitcoin over other payment systems is that, when used correctly, it
 affords users much more privacy. Acquiring, holding, and spending
 bitcoin does not require you to divulge sensitive and personally

keys.adoc

@@ -158,8 +158,7 @@ visible universe is estimated to contain 10^80^ atoms.
 [[elliptic_curve]]
 ==== Elliptic Curve Cryptography Explained
 
-((("cryptography", "elliptic curve cryptography",
-id="Celliptic04")))Elliptic curve cryptography is a type of asymmetric
+Elliptic curve cryptography is a type of asymmetric
 or public key cryptography based on the discrete logarithm problem as
 expressed by addition and multiplication on the points of an elliptic
 curve.
@@ -605,8 +604,7 @@ look at compact encoding and reliable checksums.
 [[base58]]
 === Base58Check Encoding
 
-((("addresses", "base58 and base58check encoding",
-id="Abase5804")))In order to represent long numbers in a compact way,
+In order to represent long numbers in a compact way,
 using fewer symbols, many computer systems use mixed-alphanumeric
 representations with a base (or radix) higher than 10. For example,
 whereas the traditional decimal system uses 10 numerals, 0 through 9,

mining.adoc

@@ -1873,8 +1873,7 @@ described next.
 [[bip9]]
 ==== BIP9 Signaling and Activation
 
-((("bitcoin improvement proposals", "Strict DER signatures
-(BIP66)")))The mechanism used by BIP34, BIP66, and BIP65 was
+The mechanism used by BIP34, BIP66, and BIP65 was
 successful in activating three soft forks. However, it was replaced
 because it had several limitations:
 

network.adoc

@@ -599,8 +599,7 @@ rather than fixed patterns.
 [[bloom_filters]]
 === Bloom Filters
 
-((("security", "maintaining privacy",
-id="Sprivacy08")))A bloom filter is a probabilistic search filter, a way
+A bloom filter is a probabilistic search filter, a way
 to describe a desired pattern without specifying it exactly. Bloom
 filters offer an efficient way to express a search pattern while
 protecting privacy. They are used by lightweight clients to ask their peers for