Counteparty is a P2P financial platform built on top of the Bitcoin blockchain, that provides secure financial tools and markets, not requiring a third party to use.
If in the future Bitcoin is surpassed by another coin, moving the entire network to another blockchain would take no more than a couple of days.
On Counterparty you can create your own coin(Token) to promote your business, and trade this coin as well as XCP or Bitcoin with other users. You can also make a Counterwallet to store your coins.
It's a common misconception that XCP competes with Bitcoin, while in reality it can't exist without it.
XCP is the official token of Counterparty, at the time of writing one XCP is worth 12.69$.

Bitcoin: 1F7TMMc1LwUu626sUcBoPr5bNL2dpP5gz
Ripple: rPVMhWBsfF9iMXYj3aAzJVkPDTFNSyWdKy tag: 251072656
Ethereum: 0x8f52872c8263286fd160fc88c08d802e0d927e56
Reddcoin: RqjV3ZWnzsC7oz6CpG1KKVuMWWFUJpRdDG
Litecoin: LScHXjn9Nq4gJUU177P5nCSzo4EwMEuUFA