반응형
Signatures, ECDSA, and Addresses
DIGITAL SIGNATURE SCHEMES (DSS)
- Alice uses ECDSA to generate private and public keys.
- Bob needs Alice's public key.
- Alice signs her message.
- Alice sends message + signature. (The message is the main payload, and the signature can be used to prove that Alice was the one who created that exact message.)
- Bob can easily verify if Alice signed.
암호화 알고리즘으로 ECC를 사용 ^^;
Bitcoin Script
Reminders :
- Bitcoin uses a UTXO model
- Transactions map inputs to outputs
- Transactions contain signature of owner of funds
- Spending Bitcoin is redeeming previous transaction outputs with a proof
- Public Key + Signature in Pay-to-Pub-Key-Hash
- Script + Signature in Pay-to-Script-Hash
Advanced Bitcoin Script
- In Bitcoin, senders specify a locking script, recipients provide an unlocking script.
- Pay-to-Pub-Key-Hash (P2PKH) : Vendor (recipient of transaction) says "Send your coins to the hash of this Public Key."
- Simplest case
- By far the most common case
- Pay-to-Script-Hash(P2SH) : Vendor says "Send your coins to the hash of this Script"; I will provide the script and the data to make the script evaluate to true when I redeem the coins."
- A vendor cannot say, "To pay me, write a complicated output script that will allow me to spend using multiple signatures."
TRANSACTION LOCKTIME
- Extend bitcoin scripting into the dimension of time.
- Absolute and relative timelocks
- Absolute timelocks specify UNIX timestamp
- Relative timelocks specify block height
- Transaction-level and script-level timelocks
- Transaction-level: the transaction itself will be postponed until the specified time
- UTXO-level: the locking script restricts use of specific UTXOs
이 글은 edX의 Bitcoin and Cryptocurrencies 강의 자료를 참고하여 정리한 글입니다.
반응형
