Blockstream

Since its conception, Blockstream has grown to be one of the top-funded Bitcoin companies in the space, with total investments adding up to $76 million from various (institutional) investors including Horizons Ventures, AXA Strategic Ventures, Digital Garage and, again, LinkedIn co-founder Reid Hoffman.

As of last year it received a $21 million funding round and employs several Bitcoin Core developers. The burgeoning company intends to deploy the side-chain among different exchanges and other Bitcoin service providers. Users with accounts at several of these exchanges will then be able to move bitcoin from one account to another within an instant, instead of having to wait for the transaction to confirm on the blockchain.