ClientContextKey is the key used to set the eth client on tracker contexts.

Zap Contract Address.

DataProxyKey used to access the local or remote data server proxy.

DBContextKey is the shared context key where a DB instance can be found in a context.

MasterContractContextKey is the shared context key to get shared master zap contract instance.

Ethereum wallet private key.

Ethereum wallet public address.

TransactorContractContextKey is the shared context key to get shared transactor zap contract instance.

ContractInterface represents an abstraction of function definitions that can becalled on the smart contract.

TransactionSubmitter is an abstraction for something that will callback a generator fnwith a contract able to submit and generate transactions.

TransactionGeneratorFN is a callback function that a TransactionSubmitter uses to actually invokea contract and generate a transaction.