Any idea of what exactly is in the "extra" field that is displayed by the block explorer"
For example: Extra: Geth v1.4.9 (Raw: 0xd783010409844765746887676f312e362e32856c696e7578)
For example: Extra: Geth v1.4.9 (Raw: 0xd783010409844765746887676f312e362e32856c696e7578)