Auditing DeFi in the Era of Intra-Block Loans

Intra-block loans allow uncollateralized borrowing for the duration of a single block. Unlike flash loans, capital can react to intra-block ordering and state transitions from other transactions in the same block.

For auditors and protocol developers, this means rethinking assumptions about atomicity, reentrancy across bundle boundaries, and mid-block state dependencies.

Blocktime Labs enforces repayment at the sequencing layer: if repayment fails, the entire bundle is excluded. The block itself becomes the temporary lender.