My team challenges an issue. Trying to support Bitcoin wallets in a messenger app and staying user-friendly, we need transaction lists to be receivable quick and nice. So users would not die waiting. But the only way we've found is to interact with Bitpay's Bitcore node — syncing there takes a hella lot of time. So we need another way to get these.

The issue is described in our blog, with info on what servers do we have and sync screenshots. Any recommendations or solutions would help us much.