Below is a blocktemplate_blob obtained from calling the getblocktemplate RPC, with reserve size 17.
0606e0d8bad7053a15e11686fefb667985fec2a2c89567e2c9dae9e862c76628a174eb3a00662c000000000282d55f01ffc6d45f01e8e4d19ec2870102e8f49622fd8bfd3b0bd8b20ab9f7fc8e33c7f327b0a6a6bda95096d4ab2150813401dd34b8939c64a4237cbd8ea2fad8bf87a5febbd144655e9e697fdd187a2be949021100000000000000000000000000000000000000
I'm trying to figure out how coinbase transactions are serialized. Based on CNS003 and CNS004, after stripping the block header, transaction version (0x02), unlock time (0x82d55f), num inputs (0x01), transaction type (0xff), block height (0xc6d45f), num outputs (0x01), reward (0xe8e4d19ec28701), and output type (0x02), we are left with
e8f49622fd8bfd3b0bd8b20ab9f7fc8e33c7f327b0a6a6bda95096d4ab2150813401dd34b8939c64a4237cbd8ea2fad8bf87a5febbd144655e9e697fdd187a2be949021100000000000000000000000000000000000000
which I believe consists of the output public key, extra size, and the extra. Removing the extra size and extra leaves us with
e8f49622fd8bfd3b0bd8b20ab9f7fc8e33c7f327b0a6a6bda95096d4ab2150813401dd34b8939c64a4237cbd8ea2fad8bf87a5febbd144655e9e697fdd187a2be94902
How is this coinbase transaction key generated?