In this paper, we present two proposals for multi-two-party contract signing with blockchain
support. In the scenario in this paper, a customer wants to purchase products/services from …

Electronic contract signing requires the design of protocols that guarantee that the exchange
is fair. In the past 5 years, we have observed that trusted third parties (TTPs) can be replaced …

In this article, we present the first proposal for contract signing based on blockchain that
meets the requirements of fairness, hard-timeliness, and bc-optimism. The proposal, thanks …

To be considered secure, a payment system needs to address a number of security issues.
Besides fundamental security requirements, like confidentiality, data integrity, authentication …

In this article, we present the first proposal for contract signing based on blockchain that
meets the requirements of fairness, hard-timeliness, and bc-optimism. The proposal, thanks …

In this paper, we introduce the concept of chained transaction as a transaction in which the
customer obtains a physical product from a provider using one or more active intermediaries …

In this paper, we define the concept of complex transaction as a combination in any form of
aggregate and optional transactions. Even if there are many multi-party fair exchange …

The multi-chained complex transactions protocol from [4] is build around the chained
transactions protocol. So, the formal proof of multi-chained complex transactions protocol …

In our previous work [8] we defined complex transactions as the combination in any form of
aggregate and optional transactions. The solution from [8] proposes an e-commerce …

In the electronic commerce context, it is common that a customer wishes to buy a pack of
products/services composed of several products/services from different merchants. The …