• Description
• Installation
• Setup
• Base Functions
• Helper functions

The 'ethr' R package is an interface for accessing Ethereum blockchain data in R, querying the Ethereum Blockchain via the JSON-RPC API.

ethr provides several convenience and helper functions, such as:

• Handling of hexadecimal conversion
• Access block data
• Access transaction data/transaction receipts
• Bulk download management

The package will be submitted to CRAN soon, until then you can install it from Github using devtools:

# install.packages("devtools")
devtools::install_github("BSDStudios/ethr")

The package connects to either a Geth or Parity client running on a full Ethereum node via the JSON-RPC interface https://github.com/ethereum/wiki/wiki/JSON-RPC.

Please enable the following flags for Geth and Parity respectively to ensure that they can access the client.

• Geth: --rpc --rpccorsdomain localhost
• Parity: --jsonrpc-cors '*' --geth - not connecting in latest build, we're investigating.

These base functions are direct implementations of the available JSON-RPC methods detailed here, https://github.com/ethereum/wiki/wiki/JSON-RPC and replicate their functionality as much as possible.

• eth_coinbase - Returns the client coinbase address.
• eth_gasPrice - Returns the current price per gas in wei.
• eth_accounts - Returns a list of addresses owned by client.
• eth_blockNumber - Returns the number of most recent block.
• eth_getBalance - Returns the balance of the account of given address.
• eth_getStorageAt - Returns the value from a storage position at a given address.
• eth_getTransactionCount - Returns the number of transactions sent from an address at given block number.
• eth_gethBlockTransactionCountByHash - Returns the number of transactions in a block, given the block hash.
• eth_getBlockTransactionCountByNumber - Returns the number of transactions in a block the given block number.
• eth_getCode - Returns code at a given address.
• eth_getBlockByHash - Returns information about a block from a hash.
• eth_getBlockByNumber - Returns information about a block from the block number.
• eth_getTransactionByHash - Returns the information about a transaction requested by transaction hash.
• eth_getTransactionByBlockHashAndIndex - Returns information about a transaction by block hash and transaction index position.
• eth_getTransactionByBlockNumberAndIndex - Returns information about a transaction by block number and transaction index position.
• eth_getTransactionReceipt - Returns the receipt of a transaction by transaction hash.

These functions use the base function, queering the blockchain, but make it easier for the user to download larger chunks of data and to have more control over where those chunks are taken from.

• getBockTransations will return a data frame of the transactions for either a given number of blocks or a specified range of blocks.

• getBlockHeaders will return just the block header data for a given number of blocks or specified range of blocks.getBlockHeaders will return just the block header data for a given number of blocks or specified range of blocks.

• bulkBlockDownload.R breaks a large block range up and manages the download size. All downloaded blocks will be stored in a ethr_blocks folder in the data_dir.

• getBlockRange - Returns the minimum and maximum blocks that are currently downloaded for the analysis table. Note: this does not check for continuity, only returns min and max vales.