Order flow
An order can go through several statuses. It can never go back to a previous status. Both on-chain and off-chain orders go through the same statuses and they can be differentiated by the updatedAtBlockNumber field.
The main statuses, derived from the 0x protocol are the following:
open: order was just listed by the maker
filled: order was filled by a taker
cancelled: order was cancelled
We have also added two cancel statuses to improve the on-chain system:
cancelled_by_transfer: The owner of the order's asset lost ownership of the asset.
expired: The expiry date was reached, all orders are periodically checked and cancelled when this happens.
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