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Blockchain protocols are based on a distributed database where stored data isguaranteed to be immutable. The requirement that all nodes have to maintaintheir own local copy of the database ensures security while consensusmechanisms help deciding which data gets added to the database and keeppowerful adversaries from derailing the system. However, since the databasethat forms the foundation of a blockchain is a continuously growing list ofblocks, scalability is an inherent problem of this technology. Some publicblockchains need a few 100 GB to Terabytes of storage.  In this work, we present the concept Superlight with self-contained proofs,which is designed to improve scalability of a public blockchain, whilepreserving security and decentralization. Instead of all nodes having a localcopy of the whole blockchain to verify a transaction, nodes can derive thevalidity of a transaction by only using block headers. To keep the blockheaders compact, BLS signatures are used to combine signatures. We provide adefinition of SCPs and show the required steps of a client to create a proofthat is accepted by other nodes for transferring funds. The advantage of such alight-client-only blockchain is the lower storage requirement, while thedrawback is an increased computational complexity due to BLS signatures,limited use-cases due to lack of a global state, and the requirement for aninteractive protocol between sender, receiver, and miner to create atransaction.

Superlight -- A Permissionless, Light-client Only Blockchain with Self-Contained Proofs and BLS Signatures