# US 12,764,115 B1 · Automated stand-in systems for maintaining operational continuity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,764,115 B1 - Document ID: US12764115B1 - Status: Granted - Kind: B1 - Application number: 19/630,754 - Filed: 2026-03-27 - Granted: 2026-10-13 - Earliest claimed: 2026-03-27 - Assignees: U.S. Bank National Association - Applicants: U.S. Bank National Association - Inventors: Gaurav Ashok Kshirsagar; Akshay Negi; Nageswara Rao Muvva; Andrew Kavie; Kanika Bhalla - Web page: https://patentgrep.com/patent/US12764115B1 ## CPC - H04L 63/10: {for controlling access to devices or network resources} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Various embodiments are directed to apparatuses, methods, computer-readable media, computer program products, and systems related to maintaining a proxy state log to facilitate operational continuity during system outages. In some embodiments, the method may comprise maintaining, a proxy state log comprising last-known available resource data; responsive to a first operational state change associated with a resource control system, switching the resource authorization system to a stand-in operational state in which the resource authorization system uses data from the proxy state log; updating the proxy state log based on a resource access request processed by the resource authorization system during the stand-in operational state; and responsive to a second operational state change associated with the resource control system: switching the resource authorization system to a default operational state in which the resource authorization system uses data from the resource control system; and performing a reconciliation operation. ## Claims ### Claim 1 A system comprising a resource authorization system and at least one non-transitory computer-readable medium comprising computer program instructions that, when executed by at least one processor, cause the system to: maintain, using data received from a resource control system, a proxy state log comprising last-known available resource data; responsive to a first operational state change associated with the resource control system, switch the resource authorization system to a stand-in operational state in which the resource authorization system uses data from the proxy state log without synchronizing with the resource control system; update the proxy state log based on a resource access request processed by the resource authorization system during the stand-in operational state; and responsive to a second operational state change associated with the resource control system: switch the resource authorization system to a default operational state in which the resource authorization system uses data from the resource control system; and perform a reconciliation operation to update the resource control system based on the proxy state log. ### Claim 2 (depends on 1) The system according to claim 1, wherein: the last-known available resource data is associated with a plurality of segregated resource entities; and the last-known available resource data comprises, for each of the plurality of segregated resource entities, at least one of: (i) resource availability data or (ii) resource consumption limit data. ### Claim 3 (depends on 1) The system according to claim 1, wherein: the data received from the resource control system is received via at least one of: (i) a batch ingestion data pipeline or (ii) a continuous streaming data pipeline; and maintaining the proxy state log comprises continuously updating the proxy state log with the data received from the resource control system. ### Claim 4 (depends on 1) The system according to claim 1, wherein processing the resource access request comprises: placing a processing lock on a segregated resource entity associated with the resource access request; and determining whether to authorize or deny the resource access request using the proxy state log. ### Claim 5 (depends on 4) The system according to claim 4, wherein the processing lock is configured to engage during processing of individual resource access requests to enforce sequential processing of a plurality of resource access requests during the stand-in operational state, the plurality of resource access requests comprising the resource access request. ### Claim 6 (depends on 4) The system according to claim 4, wherein determining whether to authorize or deny the resource access request comprises comparing, using the proxy state log and for the segregated resource entity, the resource access request against at least one of: (i) a resource availability value, (ii) a resource consumption limit, or (iii) resource hold data. ### Claim 7 (depends on 6) The system according to claim 6, wherein the resource availability value is associated with a resource availability category selected from among a plurality of resource availability categories based on a resource availability-state hierarchy for the plurality of resource availability categories. ### Claim 8 (depends on 1) The system according to claim 1, wherein processing the resource access request comprises: authorizing the resource access request; and generating, based on the resource access request, a resource reservation lock for a segregated resource entity associated with the resource access request, the resource reservation lock configured: (i) to characterize a provisional change to the last-known available resource data and (ii) with a predetermined duration to expiration. ### Claim 9 (depends on 1) The system according to claim 1, wherein updating the proxy state log based on the resource access request comprises updating resource hold data for at least one segregated resource entity associated with the resource access request, the resource hold data characterizing a provisional net change to be applied to the last-known available resource data caused by the resource authorization system processing one or more resource access requests during the stand-in operational state, the one or more resource access requests comprising the resource access request. ### Claim 10 (depends on 1) The system according to claim 1, wherein the computer program instructions, when executed by the at least one processor, further cause the system to maintain an immutable audit record of activity associated with at least one of: (i) the proxy state log, (ii) the resource authorization system during the stand-in operational state, or (iii) the reconciliation operation. ### Claim 11 (depends on 10) The system according to claim 10, wherein the immutable audit record comprises data characterizing at least one of: (i) reads and writes for the proxy state log, (ii) updates to the last-known available resource data, (iii) authorization decisions of the resource authorization system during the stand-in operational state, (iv) resource reservation locks, or (v) merges between the proxy state log and one or more data stores of the resource control system. ### Claim 12 (depends on 10) The system according to claim 10, wherein the reconciliation operation comprises merging data from the proxy state log and data from the immutable audit record with one or more data stores of the resource control system. ### Claim 13 (depends on 12) The system according to claim 12, wherein the data from the proxy state log and the data from the immutable audit record are merged with the one or more data stores according to one or more deterministic rules using at least one of timestamp data or data version information. ### Claim 14 (depends on 1) The system according to claim 1, wherein the reconciliation operation comprises clearing expired resource reservation locks based on a corresponding predetermined duration to expiration. ### Claim 15 (depends on 1) The system according to claim 1, wherein: the proxy state log further comprises segregated resource entity metadata; and processing the resource access request comprises identifying at least one segregated resource entity associated with the resource access request using the segregated resource entity metadata. ### Claim 16 (depends on 1) The system according to claim 1, wherein: the first operational state change comprises an unplanned outage state; and the first operational state change is identified by monitoring one or more system status indicators for the resource control system to determine the resource control system is unavailable. ### Claim 17 (depends on 16) The system according to claim 16, wherein the one or more system status indicators comprise at least one of: (i) application program interface response codes, (ii) a message queue depth indicator, (iii) a message queue lag indicator, or (iv) a circuit breaker event. ### Claim 18 (depends on 1) The system according to claim 1, wherein: the first operational state change comprises a planned outage state; and the first operational state change is identified by receiving an indication of the planned outage state during which the resource control system is unavailable. ### Claim 19 A method comprising: maintaining, using data received from a resource control system, a proxy state log comprising last-known available resource data; responsive to a first operational state change associated with the resource control system, switching a resource authorization system to a stand-in operational state in which the resource authorization system uses data from the proxy state log without synchronizing with the resource control system; updating the proxy state log based on a resource access request processed by the resource authorization system during the stand-in operational state; and responsive to a second operational state change associated with the resource control system: switching the resource authorization system to a default operational state in which the resource authorization system uses data from the resource control system; and performing a reconciliation operation to update the resource control system based on the proxy state log. ### Claim 20 At least one non-transitory computer-readable medium comprising computer coded instructions therein, wherein the computer coded instructions are configured to, when executed by at least one processor: maintain, using data received from a resource control system, a proxy state log comprising last-known available resource data; responsive to a first operational state change associated with the resource control system, switch a resource authorization system to a stand-in operational state in which the resource authorization system uses data from the proxy state log without synchronizing with the resource control system; update the proxy state log based on a resource access request processed by the resource authorization system during the stand-in operational state; and responsive to a second operational state change associated with the resource control system: switch the resource authorization system to a default operational state in which the resource authorization system uses data from the resource control system; and perform a reconciliation operation to update the resource control system based on the proxy state log.