Make our testnet explorer work
Now, the LiveNet explorer actually works (I don't know why it works, weird, DNS seeds has changed but it still downloads blocks), but the testnet explorer doesn't work.
I used to think it's because of the protocol version. But after some experiments I find maybe the testnet explorer never gets OK even when our network was running under the old protocol. We never tested the testnet explorer, until recently. A proof supporting this judgement is that I just tested the bitcore-node-crown's earlier versions, and found regtest showed exactly the same failures as the newest version.
So, to fix this bug I will need further research.
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