Application service provider featuring application programming interface (API) software for use with distributed cryptographic systems including blockchains, namely, platforms used to provide access to and interact with cryptocurrencies, cryptographic tokens, and data from distributed cryptographic systems; Application service provider featuring application programming interface (API) software for providing access to or interacting with the data from distributed cryptographic systems including blockchains and blockchain-based applications; Application service provider featuring application programming interface (API) software for accessing and interacting with cryptocurrencies, cryptographic tokens, and data in the fields of distributed cryptographic systems, distributed ledgers, and cryptographic peer-to-peer payment networks in the fields of real estate; Application service provider featuring application programming interface (API) software for creating, managing, and analyzing data on distributed cryptographic systems, distributed ledgers, and peer-to-peer transaction and cryptographic payment networks; Platform as a service (PAAS) featuring computer software platforms for real estate transactions using a cryptocurrency wallet; Platform as a service (PAAS) featuring computer software platforms for real estate trading using blockchain technology; Platform as a service (PAAS) featuring computer software platforms for real estate transactions using blockchain technology; Platform as a service (PAAS) featuring computer software platforms for use with distributed cryptographic systems including blockchains, namely, platforms used to provide access to and interact with cryptocurrencies, cryptographic tokens, and data from distributed cryptographic systems; Platform as a service (PAAS) featuring computer software platforms for using cryptocurrencies, cryptographic tokens, and data in the fields of distributed cryptographic systems, distributed ledgers, and cryptographic peer-to-peer payment networks in the field of real estate; Platform as a service (PAAS) featuring computer software platforms for using distributed cryptographic systems, distributed ledgers, and peer-to-peer transaction and cryptographic payment networks; Providing a web site featuring technology that enables users to use a cryptocurrency wallet for real estate transactions; Providing a web site featuring technology that enables users to use blockchain technology for real estate transactions and real estate trading; Providing a web site featuring technology that enables users to use cryptocurrencies, cryptographic tokens, and data in the fields of distributed cryptographic systems, distributed ledgers, and cryptographic peer-to-peer payment networks in the field of real estate; Providing a web site featuring technology that enables users to conduct real estate transactions; Providing a web site featuring technology that enables users to conduct real estate transactions using digital wallet; Providing a web site featuring technology that enables users to buy, sell, or lease real estate using blockchain technology; Providing a web site featuring technology that enables users to buy, sell, or lease real estate using cryptocurrency technology; Providing a web site featuring technology that enables users to buy, sell, or lease real estate; Providing on-line non-downloadable computer software for use as a cryptocurrency wallet; Providing temporary use of on-line non-downloadable computer software for use as a digital wallet; Providing temporary use of on-line non-downloadable computer software for use as an electronic wallet; User authentication services using blockchain technology for real estate trading