bitcoin双花

https://en.bitcoin.it/wiki/Irreversible_Transactions

https://www.reddit.com/r/Bitcoin/comments/2e7bfa/vector76_double_spend_attack/cjwya6x

http://36kr.com/p/5137942.html

https://coinsutra.com/bitcoin-double-spending/

https://bitcoil.co.il/Doublespend.pdf

https://en.bitcoin.it/wiki/Irreversible_Transactions#Attack_vectors

https://eprint.iacr.org/2012/248.pdf

https://99bitcoins.com/double-spending/

https://en.bitcoin.it/wiki/Confirmation

https://medium.com/@bramcohen/the-inevitable-demise-of-unconfirmed-bitcoin-transactions-8b5f66a44a35

https://en.bitcoin.it/wiki/Myths#Bitcoin_has_no_built-in_chargeback_mechanism_and_this_is_bad