Add already-public Cake Wallet data

dart_random_electrum_cake_wallet/README.md

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+# Cake Wallet - Weak Bitcoin Wallets
+
+This folder is about vulnerable versions of `Cake Wallet` which used the insecure `Random::Random()` PRNG of the `Dart` programming language to generate Bitcoin cryptocurrency wallets, resulting in extremely weak wallets.
+
+Unlike other wallet software, the used mnemonic standard is `Electrum`, not `BIP39`, and the public usage is (to our knowledge) Bitcoin-specific.
+
+See also:
+* https://milksad.info/posts/research-update-6/
+* https://milksad.info/posts/research-update-9/
+* https://milksad.info/posts/research-update-10/
+
+(incomplete article list)
+
+## Data
+
+### Hashed Mnemonic Seed of Discovered Wallets
+
+File: `cakewallet_weak_bitcoin_seeds_hashed_sorted_version1_2023_11.txt`
+
+A collection of hashes over the mnemonic secrets for all vulnerable wallets we discovered at the time of data set creation.
+
+* Creation date: around 2023-11-24
+* Detection: confirmed Bitcoin Mainnet usage of a `bc1` address on at least one of the sub-accounts, checked until #79
+* Bitcoin Mainnnet address database from ca. early 2023-11
+* Entry format: SHA-256 hash computed over the lowercase space-separated seed string without leading spaces, trailing spaces or newlines
+* File format: newline-separated ASCII entries, sorted
+* Additional comments: 12 word Electrum seed, "100" segwit prefix
+
+#### Data example
+
+Mnemonic: `ensure finish energy title soccer frame audit ahead swim fee course shoe`
+
+Hash result: `f56599f4353c6f5d4d01cf9a9c2548cc2a70d3684c127962515b681692ab2b3e`
+
+The example is a valid mnemonic but was unused at the time, and is therefore not included in the data set itself.
+
+#### Publication Details
+
+We provided this data set to the `Cake Wallet` vendor on 2023-11-24 for public adoption into patched new app versions. The data allows for client-side checks in the application to spot and warn of a continued use of known-vulnerable wallets.
+
+They merged it via https://github.com/cake-tech/cake_wallet/pull/1238/files on 2023-12-18.