• Application - webui and backed which is connected to DBs and expose APIs.
• Watchers - services which are watching for incoming payments on blockchain.
• The ledger - place where information about user's funds are stored.
• Exchange connectors - services which are sending requests to exchange funds.
• Hot wallet - service which get's requests to send coins to users (withdrawal).
• Funds dashboard - monitoring service which can show aggregate information about available funds.

Components

Attack vectors

1. backend: show fake address on invoice
2. watcher: don't track bc, just return 'received'
3. ledger: not correct balances
4. hot wallet: hack withdrawal private keys
5. hack exchange connector (wrong rate etc.) 

Print money problem

• Oracle (communication with Ledger)
• Watchers (fake info about received funds)
• Exchange connector (reporting fake rates)
• Ledger (minting not backed tokens)

One way communication

Solutions

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