# Note of AA

AA小抄：([Account Abstraction](https://docs.google.com/presentation/d/1oBU9XhMPAMADw5I0G7AChE_NhanA0tKAlq7EtaLHkZU/edit#slide=id.p))

方向：

Flexible key management and recovery

Arbitrary access control mechanisms

Gas payment can be abstracted

Better efficiency and usability

Opportunity to innovate where it matters most: U

场景：

Social recovery

Dead man’s switch

Multisig

Per-device keys

BLS aggregation

Quantum resistant signatures

Spending limits

Small payments? Seamless from your wallet.

Sending $1M? Go get your ledger.

Multiple roles, delegating specific actions.

Payroll can pay employees once a month, with a spending limit and a signature from the controller.

Legal can perform on-chain votes with the company’s tokens, but can’t transfer them.

CFO can transfer any sum with 24 hours delay and a signature from another C-level executive.

External auditor monitors delayed payments and can veto them, but can’t initiate transfers.

Session keys

Ephemeral key kept in the browser can perform less-sensitive operations.

Gas sponsorship models

Pay gas with ERC20 tokens

Privacy - interacting with the blockchain without buying ETH

Cross-chain operations

Batching and atomicity

Automating time-delayed and event-driven flows

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