It is also useful for betting: an oracle will associate a hash with each
possible outcome, and when outcome is know, it will reveal a corresponding
preimage which will unlock the transaction.
This approach has several advantages over approach with multi-sig script:
1. oracle doesn't need to be involved in each specific transaction
2. resolution is same for everyone who makes a bet on a specific event
outcome
3. no need for two-way communication
4. no need for a special protocol: oracle might publish unlocking preimage
on a web page, and participants will manually enter it into their clients
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