The E-Commerce Act allows for electronic equivalents of writing and signature but does not require anyone to accept them, so it would apply to support the legal validity of transactions only where the parties agree to use e-documents. (slaw.ca)
Mining, a process by which individuals or groups get paid in new Bitcoins to run complex mathematical equations on high - powered computers in order to confirm the validity of transactions, has drawn scrutiny from environmentalists who say it's sucking up too much electricity. (fortune.com)
Finally, a dispute over the validity of a transaction in the case of fraud or theft will be resolved to the best of the ability of American Express. (lendedu.com)