There's on chain stuff like Taproot adoption that is live but not well adopted yet. There's also things like RGB which again aren't being adopted. Then there are future hypothetical solutions like Cross Input Sig Agg, CTV and channel factories and splicing. All come with their own unique hurdles and set of tradeoffs.

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I wouldn’t consider taproot and CISA scaling solutions, more just using on-chain space more efficiently and more privately. in order to be effective, scaling solutions can’t be bounded by the block weight limit. covenants seem the most promising step forward for enabling more off-chain scaling protocols (ARK, eltoo, etc), while also enabling more use cases on-chain