ConvertToHashSlice convert string slice to hash slice.

ConvertToNumberedEpoch converts named epoch to numbered epoch if necessary.

IsEip155Tx check if the EVM transaction is compliant to EIP155.

IsEmptyBlock checks if block contains any executed transaction(s).

Helper function to check if interface value is nil, since "i == nil" checks nil interface case only.

IsLegacyEthTx check if the EVM transaction is legacy (pre EIP155).

IsSuccessEthTx check if the EVM transaction is success.

IsValidHashStr validates if the search (block/tx) hash contains the right characters and in the right length.

NormalizeEthBlockNumber normalizes ETH block number to be positive if necessary.

StripLogExtraFields strips extra unnecessary fields from logs to comply with fullnode rpc.

ExpirableLruCache naive implementation of LRU cache with fixed TTL expiration duration.