In-line verification of transactions

A computing device, comprising:

• a communication port configured for communicating data with other computing devices;
• a processor device;
• and
• a non-transitory computer-readable storage memory comprising code that is executable by the processor device to:
• intercept a transfer prior to a settlement system;
• use a transaction identifier of the transfer to access information from an immutable ledger;
• confirm that the information from the immutable ledger is consistent with data of the transfer;
• and
• in response to confirming that the information is consistent with the data of the transfer, provide the transfer to the settlement system,
• wherein the computing device is an interceptor of a transactions system, the interceptor configured to prevent the transfer from executing in response to failing to confirm that the data from the transfer matches the information in the immutable ledger,
• wherein the interceptor is configured to be positioned in a semi-isolated zone with the immutable ledger such that the interceptor and the immutable ledger are semi-accessible to users of the transactions system, wherein the interceptor is configured to communicate with the settlement system in an isolated zone that is inaccessible to the users.

A method comprising:

• receiving, by a notary system comprising a processor device executing code, parameters of a transfer;
• verifying, by the notary system, the transfer using a multi-factor authentication process;
• in response to verifying the transfer, using a private key to countersign the transfer and returning, by the notary system, a signed transfer package for execution of the transfer;
• providing, by the notary system, the parameters of the transfer and countersign data to an immutable ledger;
• intercepting, by an interceptor comprising a processor device executing code, the transfer prior to a settlement system;
• using, by the interceptor, a transaction identifier of the transfer to access information from the immutable ledger;
• confirming that the information from the immutable ledger is consistent with data of the transfer;
• and
• in response to confirming that the information is consistent with the data of the transfer, providing the transfer to the settlement system,
• wherein the notary system is in a non-isolated zone accessible to users and the interceptor is in a semi-isolated zone that is semi-accessible to the users.