System and method implementing a distributed audit trail
Various disclosed embodiments pertain to a distributed audit trail system for use in a connected system including: a master unit to control a first aspect of the connected system and to create a blockchain light client and a distributed hash table (DHT); a first node to control a second aspect of the connected system; a second node to control a third aspect of the connected system; and one or more remote servers to form a blockchain full node, where the master unit, the first node, and the second node electronically communicate with each other through the DHT in order to form a combined audit trail, where the master unit creates a meta-hash of the software version of the software in the master unit, the first node, and the second node, system identification data, system sensor data, and system hardware configuration.
1. A distributed audit trail system for use in a connected system comprising:
a master unit comprising a master processor and a master memory with programming executable by the master processor to:
control a first aspect of a connected system, wherein the connected system corresponds to a vehicle that houses the master unit and a plurality of independent nodes;
create:
a meta-hash corresponding to a system-operating element, wherein:
the system-operating element is selected from the group consisting of respective software versions used in each of the master unit and the plurality of independent nodes; vehicle identification data; vehicle sensor data; and a vehicle hardware configuration; and
the meta-hash is a unique hash identifying a state of the system-operating element:
a blockchain light client; and
a first portion of a distributed hash table (DHT) that is stored by the master unit; and
deliver the meta-hash to a blockchain full node through the blockchain light client;
a first node of the plurality of independent nodes, comprising a first node processor and a first node memory with programming executable by the first node processor to control a second aspect of the connected system, and create and store a second portion of the DHT;
a second node of the plurality of independent nodes, comprising a second node processor and a second node memory with programming executable by the second node processor to control a third aspect of the connected system, and create and store a third portion of the DHT, wherein the master unit, the first node, and the second node:
electronically communicate with each other to form the DHT in order to create a combined audit trail; and
each comprise a system component selected from the group consisting of an infotainment system, an engine control unit, a body control module, and a transmission control module; and
one or more remote servers, each including a server processor and a server memory with programming executable to:
form the blockchain full node; and
perform a check of the meta-hash, which compares the meta-hash to a stored library of safe meta-hashes, wherein, the check not identifying the meta-hash in the stored library of safe meta-hashes indicates an error with a source of the system-operating element corresponding to the meta-hash.
2. The distributed audit trail system of claim 1 , wherein the server memory further includes programming executable to perform, when the check indicates a mismatch between the meta-hash and the stored library of safe meta-hashes, at least one action selected from the group consisting of:
sending a notification to a service provider;
performing an over-the-air update to a system software; and
immobilizing the connected system until the system software is manually reinstalled.
3. The distributed audit trail system of claim 1 , further comprising a third node, comprising a third node processor and a third node memory with programming executable by the third node processor to control a fourth aspect of the connected system wherein the third node electronically communicates with the master unit through the DHT in order to create the combined audit trail.
4. The distributed audit trail system of claim 1 , further comprising a parity node, comprising a parity processor and a parity memory with programming executable by the parity processor to partially replicate respective portions of the DHT stored in each of the master unit, the first node, and the second node.
5. The distributed audit trail system of claim 4 , wherein the parity node comprises at least one additional system component selected from the group consisting of the infotainment system, the engine control unit, the body control module, and the transmission control module.
6. The distributed audit trail system of claim 4 , wherein the master unit, the first node, the second node, and the parity node collectively make up a parity system configured to detect and correct corruption in case at least one of the master unit, the first node, the second node, or the parity node fails.
7. The distributed audit trail system of claim 6 , wherein various subsets of portions of the DHT within at least one the master unit, the first node, the second node, or the parity node are duplicated within at least one other of the master unit, the first node, the second node, or the parity node.
8. The distributed audit trail system of claim 1 , wherein the master unit is a master infotainment system.
9. A method of operating a master unit to create a distributed audit trail system for use in a connected system, the method comprising:
communicating with a plurality of independent nodes and one or more remote servers to control a connected system corresponding to a vehicle that houses the master unit and the plurality of independent nodes;
creating:
a blockchain light client; and
a distributed hash table (DHT) with a first node and a second node of the plurality of independent nodes, wherein the first node, the second node, and the master unit each:
store a portion of the DHT; and
comprise a system component selected from the group consisting of an infotainment system, an engine control unit, a body control module, and a transmission control module;
communicating with the first node and the second node to form the DHT to create a combined audit trail;
creating a meta-hash corresponding to a system-operating element selected from the group consisting of respective software versions used in each of the master unit and the plurality of independent nodes; vehicle data; vehicle sensor data; and a vehicle hardware configuration, wherein:
the meta-hash is a unique hash identifying a state of the system-operating element; and
a check of the meta-hash indicating a mismatch compared to a stored library of safe meta-hashes indicates an error with a source of the system-operating element corresponding to the meta-hash; and
delivering the meta-hash to a blockchain full node on the one or more remote servers.
10. The method of claim 9 , further comprising receiving an indication of the mismatch between the meta-hash and a library of safe meta-hashes.
11. The method of claim 10 , further comprising, in response to the indication of the mismatch, receiving an over-the-air update to particular software in at least one of the master unit, the first node, or the second node.
12. The method of claim 10 , further comprising, in response to the indication of the mismatch, immobilizing the connected system.
13. The method of claim 9 , further comprising communicating with a third node through the DHT to create the combined audit trail.
14. The method of claim 9 , wherein the master unit controls a first aspect of the connected system, the first node controls a second aspect of the connected system, and the second node controls a third aspect of the connected system.
15. The method of claim 9 , further comprising communicating with a parity node configured to partially replicate respective portions of the DHT stored in the master unit, the first node, and the second node.
16. The method of claim 15 , wherein the parity node comprises at least one additional system component selected from the group consisting of the infotainment system, the engine control unit, the body control module, and the transmission control module.
17. The method of claim 16 , wherein the master unit, the first node, the second node, and the parity node collectively make up a parity system configured to detect and correct corruption in case at least one of the master unit, the first node, the second node, or the parity node fails.
18. The method of claim 16 , wherein various subsets of portions of the DHT within at least one the master unit, the first node, the second node, or the parity node are duplicated within at least one other of the master unit, the first node, the second node, or the parity node.