  Blockchains and distributed ledger technology offer promising capabilities
for supporting collaborative business processes across organizations.
Typically, approaches in this field fall into two categories: either executing
the entire process model on the blockchain or using the blockchain primarily to
enforce or monitor the exchange of messages between participants. Our work
proposes a novel approach that sits between these two methods.
  We introduce a centralized process model extended with blockchain
annotations, detailing the tasks of each participating organization and the
extent to which blockchain technology is needed to secure task execution. This
model also includes all critical data objects and specifies how their handling
should be protected by the blockchain.
  This technical report outlines a systematic three-step method for
automatically decentralizing this comprehensive model into individual local
process models for each organization, coupled with a separate process model for
the blockchain. This decentralized structure effectively replicates the
original global process model.
  Our transformation approach is rule-based, focusing on creating a
platform-inde-pendent model first, then a platform-specific model.
Subsequently, we project the platform-specific model to obtain one model for
the blockchain and one model for each participating organization.
