Providing use of non-downloadable software for analyzing and storing financial data relating to securities lending and securities borrowing transactions; Blockchain as a service (BAAS) featuring services using a distributed ledger for use in electronically storing, sending, receiving, accepting and transmitting information relating to reconciliation of securities lending transactions; Non-downloadable software platform and application programming interface (API) software for document identification, authentication, and storage via blockchain in reconciliation of securities lending transactions; providing non-downloadable blockchain computer software for administering decentralized computer blockchain applications for use in centralized reconciliation of securities lending transactions