POED
 The mechanism Block Collider uses to weave the bridged chains together is built into the multichain’s consensus mode, Proof-of-Distance (PoD). Competitors in the space, as mentioned earlier, use validators or trusted nodes to find the latest block-state for every chain they are bridging. Block Collider takes a different approach, tasking its miners with solving for PoD, a variation of Proof-of-Work which is based on Cosine Distance
PoD involves miners who receive the latest blocks from each bridged-chain. They are tasked with finding a hash that lies between all of the header hashes of that miners have collected from the bridged chains
 it is a mathematical and fully decentralized solution to finding the “intermediary hash” of all bridged chains at any given time. Miners who successfully find the closest intermediary hash, thereby creating the next Block Collider block, are rewarded in NRG, the native currency in Block Collider’s multichain  There is only one next block, making for a hypercompetitive mining process, which will only scale as more bridged chains are included into the protocol.
The "mining" of the Collider multichain is the computational challenge of finding a hash that satisfies a minimum edit distance between the hashes of member chains, its transactions, and its previous block. Block Collider uses the Cosine Similarity algorithm to score the similarity between two hashes.
the Collider multichain is targeted to release a new block approximately 5.5 seconds lagged behind the most recent block of any of the bridged blockchains.

Basically BC's blocks are created by finding the nearest block of the bridged chains, adapting constantly.

I hope this helps a bit.
To find more, whitepaper, TG advanced group, website.