docs(tip-1040): epoch-scoped temporary storage precompile#3879
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Reopened from #3366. Epoch-based expiring storage with automatic pruning. Values live for 2^16 to 2^17 blocks, scoped per epoch account. Amp-Thread-ID: https://ampcode.com/threads/T-019e12a5-b71d-72db-afef-0fcd16f065d5
decofe
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0xKitsune,
dankrad,
danrobinson and
legion2002
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Key changes from original: - temporaryStore now takes numEpochs (1-512) for configurable lifetime - Tiered gas pricing: 20k (1 epoch) -> 250k (181-512 epochs) - temporaryLoad scans backwards from current epoch to find live entries - New temporaryLoadExpiry returns value + remaining lifetime - MAX_EXPIRY_EPOCHS=512 covers ~1 year at 1s blocks - Pruning remains deterministic: epoch account E droppable when current_epoch > E + MAX_EXPIRY_EPOCHS Motivated by MPP session duration flexibility. Amp-Thread-ID: https://ampcode.com/threads/T-019e12a5-b71d-72db-afef-0fcd16f065d5
This was referenced May 11, 2026
… (day/week/month/year) Replaces the variable numEpochs + backward-scanning design with four fixed epoch tiers. Each tier uses the original simple 2-epoch model (current + previous), eliminating: - Backward scan across up to 512 epoch accounts on load - Per-entry metadata slot for individual expiry tracking - Unpredictable load gas costs Tiers: day (~18h, 20k gas), week (~6d, 80k), month (~24d, 160k), year (~388d, 250k). At most 8 live epoch accounts total (2 per tier). Amp-Thread-ID: https://ampcode.com/threads/T-019e2218-8522-7664-9b02-c1f731c33f19
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Reopened from #3366 for renewed discussion.
TIP-1040: Epoch-Scoped Temporary Storage
Approach: Epoch-based expiring storage. Values written in epoch E are readable in epochs E and E+1, then automatically expire.
Key design points
keccak256(sender || key)in a per-epoch account — sender-isolated, no collisions.temporaryStore: 40k gas for new slots, SSTORE-equivalent for overwrites.temporaryLoad: EIP-2929 cold/warm model (2,100 / 100 gas), falls back to previous epoch.Tradeoffs vs TIP-1048 (MEV-based)
See thread discussion: https://tempoxyz.slack.com/archives/C0A761BDJ6P/p1774624334588709
cc @klkvr @dankrad