Preview:
Superconducting Transaction feature to be added in the incoming update.
from the Whitepaper:
Though onchain asset exchange is supported by Antshares, the Antshares Blockchain itself does not provide functions like order-book-keeping and order-matching. It performs merely the execution and clearing&settlement of the trades. Our hierarchical design places the order-book-keeping and order-matching functions on the second layer while achieving the full trading capacity through a mechanism called superconducting transaction.
Parties involved in a superconducting transaction do not need to escrow their assets through a middleman (traditional exchange). Users send private-key-signed orders to the exchange while the latter completes the order-matching, then broadcast it onchain, then the clearing&settlement. Assets, all along the way, are within the control of the users, eliminating the moral risks of traditional exchanges. With the superconducting mechanism, exchanges perform merely the order-matching.
With the superconducting transaction mechanism, users enjoy absolute control. They can actively launch double-spending attack to avoid the order in question being settled. Exchanges, on the other hand, may blacklist the user as punishment and deterrence.