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There are a couple of things you could mean by this, so I'll address the ones I can think of. If you meant something else, let me know. 1. Within the sidechain paper we talk of the bitcoin mainchain and an indefinite number of sidechains which share the bitcoin currency as an imported asset. What this actually means is that on each of the sidechains there exists an issued asset native to that chain, whose issuance mechanism involves verifying that a corresponding number of bitcoins were sent to a locking script of a particular form. Those bitcoins are unlocked by provably undoing the issuance