Add brainwallet related research

all_bitcoin_addresses.sh

@@ -1,3 +1,4 @@
 #!/bin/bash
 
 find ./ -iname "victim*addresses*bitcoin*" -exec cat {} \; | sort -u
+find ./ -iname "brainwallet*addresses*bitcoin*" -exec cat {} \; | sort -u

brainwallet/README.md

@@ -0,0 +1,5 @@
+# Discovered Brainwallets
+
+[Brainwallets](https://en.wikipedia.org/wiki/Cryptocurrency_wallet#Wallets) are cryptocurrency wallets with a private key that is directly generated from a human-chosen passphrase, not on entropy generated from a (potentially weak) random number generator. Additionally, the key derivation method is usually extremely fast, such as a fast hash algorithm operation.
+
+This makes brainwallets extremely susceptible to offline brute-force attacks, so they're a great way to lose cryptocurrencies to attackers.

brainwallet/single_sha256_direct/README.md

@@ -0,0 +1,10 @@
+# Single SHA256 Brainwallet
+
+For this type of brainwallets, a passphrase is hashed with one iteration of SHA256, and the resulting output is directly used as a 256 bit private key.
+
+The collection of Bitcoin addresses presented here is mostly based on passphrases included in the public [privatekeys.pw](https://privatekeys.pw/brainwallet/bitcoin/1) brainwallet list. (Note that we do not endorse this site or its paid services.)
+We performed some additional searches for well-known passphrases on top of this initial list.
+
+The Bitcoin addresses represent compressed and uncompressed public keys.
+
+Due to the nature of brainwallets, the collection is not exhaustive.

generate_statistics.sh

@@ -1,16 +1,26 @@
 #!/bin/bash
 
-bitcoin_address_list=$(find ./ -iname "victim*addresses*bitcoin*" -exec cat {} \; | sort -u)
+bitcoin_address_list_rng=$(find ./ -iname "victim*addresses*bitcoin*" -exec cat {} \; | sort -u)
+bitcoin_address_list_brainwallet=$(find ./ -iname "brainwallet*addresses*bitcoin*" -exec cat {} \; | sort -u)
 
-echo -n "Number of unique weak Bitcoin wallet addresses: "
-echo "${bitcoin_address_list}" | wc -l
+echo -n "Number of unique weak PRNG Bitcoin wallet addresses: "
+echo "${bitcoin_address_list_rng}" | wc -l
 for prefix in "1" "3" "bc1q" "bc1p"
     do
     echo -n "Prefix ${prefix}: "
-    echo "${bitcoin_address_list}" | grep -Poh "^${prefix}" | wc -l
+    echo "${bitcoin_address_list_rng}" | grep -Poh "^${prefix}" | wc -l
 done
 
 echo ""
 
-echo -n "Number of unique weak Ethereum wallet addresses: "
+echo -n "Number of unique weak brainwallet Bitcoin wallet addresses: "
+echo "${bitcoin_address_list_brainwallet}" | wc -l
+for prefix in "1" "3" "bc1q" "bc1p"
+    do
+    echo -n "Prefix ${prefix}: "
+    echo "${bitcoin_address_list_brainwallet}" | grep -Poh "^${prefix}" | wc -l
+done
+echo ""
+
+echo -n "Number of unique weak PRNG Ethereum wallet addresses: "
 find ./ -iname "victim*addresses*ethereum*" -exec cat {} \; | sort -u | wc -l