1. Light Node
2. Liquidity
3. Lambo
4. Inflation
5. Decryption
6. Double Spend
7. Authentication

I hope i got it right!  

I thought the answer is miner but it seems the clue I got is b and the puzzle clue is verifies transactions that made me think miners verifies transactions before it is confirmed.

Crossword Puzzle
6. Blockchain validator
7. Legacy address


8 or 6 down. Block