Ethereum

3. action to undo state changes in Ethereum if execution runs out of gas.
7. transition function takes a state and a transaction and outputs a new state.
8. computer chip designed for specific tasks like Bitcoin mining.
9. proof of work system allowing public agreement on transaction order.
11. unspent transaction outputs representing coins in the Bitcoin state.
12. decentralized peer-to-peer online currency.
16. property allowing a system to encode any computation including loops.
18. internal crypto-fuel used for paying transaction fees in Ethereum.
19. of work mechanism for nodes to gain participation rights by solving computational puzzles.
20. in Ethereum state with address balance code and storage.

1. tree data structure allowing verification of block data piecemeal.
2. signed data package sending a message from an Ethereum externally owned account.
4. package of transactions created by miners.
5. contracts systems automatically move digital assets according to pre-specified rules.
6. virtual entity with members controlling funds and code via blockchain.
10. coins protocol allowing creation of custom digital currencies on Bitcoin.
13. early altcoin for decentralized name registration.
14. fee paid per computational step in an Ethereum transaction.
15. blockchain platform with built-in Turing-complete programming language.
17. protocol for light node transaction verification without the full blockchain.