On Transactions (speed and functionality):
- The Lightning network (Introduces channel factories and private messages on Bitcoin’s second layer)
- Blockstream’s Atomic swaps on Liquid, a sidechain-based settlement network for traders and exchanges.
- Blockstream’s Elements, an open source, sidechain-capable blockchain platform, providing access to powerful features such as Confidential Transactions and Issued Assets.
- RSK (for the development of smart contracts on Bitcoin’s second layer)
On the mining front:
- The Fiber Network for connecting all the miners
- Matt Corallo’s Stratum Version 2 Protocol, (“going to make it a lot better for individual miners to control how the blocks get created instead of the mining pool screening it,” says Mayer).
- Mining derivatives (“like hashing contracts, will likely trade on a CFTC regulated swap execution facility,” says Mayer).
On the privacy front; particularly confidential transactions:
- CoinJoin
- Mimblewimble
- Dandelion
- Bulletproof (shorter proofs for more efficient confidential transactions)
- SNICKER (coin mixing)
- Value Shuffle (coin mixing)
Smart Contracts:
- Mast (Merklized Abstract Syntax Tree, for smaller transaction sizes, more privacy, and larger smart contracts)
- Taproot (for expanding Bitcoin smart contract flexibility)
- Graph root
- Tap script (Improvement’s to Bitcoin’s script structure)
source: cryptographicasset.com/the-state-of-bitcoin-according-to-btc-investor-trace-mayer/
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