We are aware of a critical issue with NBXplorer being unable to process specially crafted transaction in the Bitcoin blockchain block 896727. Our team has already deployed a fix. To resolve the issue with your BTCPay, update your NBXplorer to version 2.5.26. If you're on the 2.x branch of BTCPay Server using btcpayserver-docker, simply click Update button in Server administration (or run http://btcpay-update.sh) and the issue will be resolved. If you're on a pre-2.0 version and aren't ready to move to 2.x yet, you can switch to the 1.13.x branch and use it to bump the NBXplorer dependency. https://github.com/btcpayserver/btcpayserver-docker/tree/… Thanks to everyone who reported the issue and allowed us to quickly deploy a fix. For more details, please visit GitHub and review @1248b16a…2e20ed4b PR: https://github.com/MetacoSA/NBitcoin/pull/1269