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20 lines
1.5 KiB
Markdown
20 lines
1.5 KiB
Markdown
# Building The Reward Block Application
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Our project aims to
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* retrieve the latest block height from the Ethereum mainnet,
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* use that result to retrieve the associated reward block data and
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* store the result in a SQlite database
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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:
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* [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
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* [getBlockReward](https://api.etherscan.io/api?module=block&action=getblockreward&blockno=2165403&apikey=YourApiKeyToken), which returns the block and uncle reward by block height
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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.
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The high-level workflow of our application is depicted in Figure 1.
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