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development_development/development_reward_block_app/README.md

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+# Building The Reward Block Application
+
+Our project aims to
+
+* retrieve the latest block height from the Ethereum mainnet,
+* use that result to retrieve the associated reward block data and 
+* store the result in a SQlite database 
+
+In order to simplify Ethereum data access, we will be using the [Etherscan API](https://etherscan.io/apis). Make sure you got yours ready as we are using two Etherscan endpoints:
+
+* [eth\_blockNumber](https://api.etherscan.io/api?module=proxy&action=eth_blockNumber&apikey=YourApiKeyToken), which returns the most recent block height as a hex string and 
+* [getBlockReward](https://api.etherscan.io/api?module=block&action=getblockreward&blockno=2165403&apikey=YourApiKeyToken), which returns the block and uncle reward by block height
+
+Both _eth\_blockNumber_ and _getBlockReward_ need access to remote endpoints and for our purposes, a cUrl service will do just fine. Hence, we ned to implement a curl adapter to access the curl binaries of the node. Moreover, as _eth\_blockNumber_ returns a hex string and _getBlockReward_ requires an integer, we need a hex to int conversion, which we are going to implement as a stand-alone service. Finally, a SQLite adapter is also required, although the sqlite3.wasm module is [readily available](https://github.com/fluencelabs/sqlite/releases) from the Fluence repo.
+
+The high-level workflow of our application is depicted in Figure 1.
+
+![Figure 1: Stylized Workflow](../../.gitbook/assets/image%20%282%29.png)
+