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fix transfer invariant, credits to @holiman for finding the edge case #916

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Apr 14, 2019
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fix transfer invariant, credits to @holiman for finding the edge case #916

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8e4c3d8
fix transfer invariant, credits to @holiman for finding the edge case
protolambda Apr 14, 2019
aeb7487
Update 0_beacon-chain.md
JustinDrake Apr 14, 2019
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2 changes: 2 additions & 0 deletions specs/core/0_beacon-chain.md
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Expand Up @@ -2416,6 +2416,8 @@ def process_transfer(state: BeaconState, transfer: Transfer) -> None:
get_balance(state, transfer.sender) == transfer.amount + transfer.fee or
get_balance(state, transfer.sender) >= transfer.amount + transfer.fee + MIN_DEPOSIT_AMOUNT
)
# No self-transfers (to enforce >= MIN_DEPOSIT_AMOUNT or zero balance invariant)
assert transfer.sender != transfer.recipient
# A transfer is valid in only one slot
assert state.slot == transfer.slot
# Only withdrawn or not-yet-deposited accounts can transfer
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