JOIN-ACCUMULATE MACHINE:
A SEMI-COHERENT SCALABLE TRUSTLESS VM

${KeywordAbstract} We present a comprehensive and formal definition of ${KeywordJam}, a protocol combining elements of both Polkadot and Ethereum. In a single coherent model, ${KeywordJam} provides a global singleton permissionless object environment—much like the smart-contract environment pioneered by Ethereum—paired with secure sideband computation parallelized over a scalable node network, a proposition pioneered by Polkadot.

${KeywordJam} introduces a decentralized hybrid system offering smart-contract functionality structured around a secure and scalable in-core/on-chain dualism. While the smart-contract functionality implies some similarities with Ethereum’s paradigm, the overall model of the service offered is driven largely by underlying architecture of Polkadot.

${KeywordJam} is permissionless in nature, allowing anyone to deploy code as a service on it for a fee commensurate with the resources this code utilizes and to induce execution of this code through the procurement and allocation of core-time, a metric of resilient and ubiquitous computation, somewhat similar to the purchasing of gas in Ethereum. We already envision a Polkadot-compatible CoreChains service.