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content/notes/412-lectures.md
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@ -102,4 +102,21 @@ content of transaction
- remainder of input, after subtracting output, is transaction fee
- can search back in time to find a transaction
- either genesis block (50 bitcoin) ir a coinbase mining reward
-
main node roles
- network - all nodes help routing with p2p protocol
- wallet - manage keys that show ownership of transactions
- miner - participate in proof of work block verifications
- blockchain - can carry full blockchain
bitcoin core refereence client contains all four functions
- miners (may) leave out wallet
- lightweight wallet only has wallet and network components
- some nodes store blockchain but do not do mining
# Lecture 9
![merkle tree|300](https://i.imgur.com/umkxpSZ.png)
Merkle tree
- hash value compted for each data block
- tree built with parent