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This chapter contributes to evolving the versatility and complexity ofblockchain-enabled services through extending the functionality ofblockchain-enforced smart contracts. The contributions include: (i) a methodfor automated management of contracts with hierarchical conditionalitystructures through an hierarchy of intelligent agents and the use ofhierarchical cryptographic key-pairs; (ii) a method for efficient and securematching and transfer of smart- contract underlyings (entities) among disparatesmart contracts/subcontracts; (iii) a method for producing an hierarchy ofcommon secrets to facilitate hierarchical communication channels of increasedsecurity in the context of smart contracts/subcontracts/underlyings; and (iv) amethod for building secure and optimized repositories through distributed hashtables in the context of contracts/ subcontracts/underlyings. These methodshelp providing services that allow both narrower and worldwide reach anddistribution of resources. The longevity of the blockchain technology isachieved through continuous innovation. Blockchain-enabled services arepotentially an efficient, secure, automated, and cost-effective alternative orcomplement to current service infrastructures in a range of domains (legal,medical, financial, government, IoT).

Sustainable blockchain-enabled services: Smart contracts