Idea: an API that, given a list of address Ethereum addresses would return the corresponding list of public keys (easy to retrieve if the wallet sent at least one transaction, or signed one message). Null would be returned if no information is available.

Idea: an API that, given a list of address Ethereum addresses would return the corresponding list of public keys (easy to retrieve if the wallet sent at least one transaction, or signed one message). Null would be returned if no information is available.