Since its inception, Bitcoin has undergone several notable developments and changes that weren’t explicitly detailed in Satoshi Nakamoto’s original white paper.
These changes have been implemented to improve various aspects of the network, including security, scalability, and functionality.
Some of the major changes include:
Segregated Witness (SegWit)
Implemented in 2017 (Bitcoin Improvement Proposal 141), SegWit was a major upgrade to the Bitcoin network. It addressed several issues, most notably transaction malleability and scalability. SegWit works by segregating the digital signature (which accounts for about 65% of the space in a given transaction) from the transaction data. This allows more transactions to fit in a block and improves the block’s efficiency.
Lightning Network
While not a direct change to the Bitcoin blockchain, the Lightning Network is a second-layer protocol that operates on top of the Bitcoin blockchain. It enables faster and cheaper transactions by allowing users to create payment channels between any two parties on that extra layer.
This network addresses the scalability issues of Bitcoin by taking frequent, small transactions off-chain, only settling on the Bitcoin blockchain when the payment channels are closed.
Increased Block Size
The original Bitcoin block size was 1 MB, which limited the number of transactions that could be processed in each block. While the block size itself hasn’t been increased, the implementation of SegWit effectively increased the block capacity by allowing certain data to be stored off the main blockchain.
Taproot
Implemented in November 2021 (Bitcoin Improvement Proposal 341), Taproot is a soft fork that enhances Bitcoin’s scripts to increase privacy and improve other factors related to complex transactions. It allows for more complex conditions for transactions, improves efficiency and privacy by making all transactions appear the same to external observers, and optimizes the way scripts are processed and verified.
Multi-Signature Transactions
The white paper didn’t explicitly outline multi-signature transactions, which allow a transaction to require multiple independent approvals before it is executed. This feature adds a layer of security and is useful for various purposes, including shared control of funds and escrow services.
Payment Protocol (BIP70)
Introduced to improve the security and user experience of Bitcoin payments, BIP70 standardizes and streamlines the process of making a payment in Bitcoin, ensuring that payments are sent to the correct address and secured.
Check Sequence Verify (CSV) and Check Lock Time Verify (CLTV)
These are opcodes that were added to Bitcoin’s scripting language to enable more complex types of transactions like those used in the Lightning Network.
How Bitcoin Changes
These changes are a result of the collaborative effort of the Bitcoin community and are implemented through various Bitcoin Improvement Proposals (BIPs).
Each proposal undergoes thorough scrutiny and discussion before being adopted.
This collaborative and cautious approach to development is part of what maintains Bitcoin’s stability and security over time.
