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i think nano/raiblocks currency can do that. and there may be others too however what you are asking is not a requirement - all online transactions will wait

i think nano/raiblocks currency can do that. and there may be others too however what you are asking is not a requirement - all online transactions will wait for an internet connection before actions can be taken, and this is true even today for physical goods - the paperwork must match before products can be moved.

saryant 8y ago
Things have changed in recent years, but for decades retailers have sold goods without knowing if payment would clear—they accepted checks.
- return1 8y ago
  that is not a responsibility of the currency however. you can build a trust system on top of the 'transactions layer'