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Tezos position paper describes checkpointing (not the disk storage check pointing coming in tezos-node soon) and TAPOS as protection against long range attacks.

Are they implemented somehow in the current eco-system?

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I found an effort for the checkpoint:

https://tezosbtc.com/ burns Tezos block hashes into Bitcoin blockchain.

The following video https://www.youtube.com/watch?v=WEjxfpREhzQ&feature=youtu.be explains the details.

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