The idea is that Bitcoins become encumbered by providing addresses of multiple parties, thus requiring cooperation of those parties in order to do anything with them. Here is an overview of some approaches. The company, for security reasons, would not want a single one of its employees to have access to the company BTC wallet's password. This application's source is published at m/mycelium-com/wallet.
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If transaction goes smoothly, then both buyer and seller sign the transaction to forward the money to the seller. Hardware wallets are the best balance between very high security and ease of use. BIP70 payment request compatible - Proof-of-Payment (BIP120/121 thanks Kalle Rosenbaum for the collaboration - Integration m to send money via sepa wires within the European Union - Integration m to lock value of your coins in USD/EUR/GBP, avoid exchange rate fluctuation. Losing the safe deposit box also doesn't result in loss. Backup your wallet, stored in a safe place, a backup of your wallet can protect you against computer failures and many human mistakes. Three people are required to actually spend the money but anybody can donate to the project's address. 2-of-3: Improved hot wallet security for businesses - A bitcoin business such as an exchange holds one private key online and one private key as paper backup.