Thanks. So Burstcoin uses some kind of checkpointing. This does not necessarily prevent grinding, though. If the challenge of in a block depends on information that the miner of the previous block can modify (like the transactions, nonce, ...), then grinding is possible: the miner can adjust his block in order to maximize his chances of mining the next block. Checkpointing won't help.
Still I'm a bit surprised that there is no official document where all these potential issues are analysed in detail. Thanks for info anyway.