Wondering what is the difference between coinbase transactions. For example, this coinbase transaction has short extra field:
016e823f579828d0247e7f4f86deb9189923ca2b97d42bde8e77dfebe24b8217d60208000000025495d62b
On the other hand, this transaction has long extra field:
011387342c514195795e3088503cbac8b1f947db67a567933dc688faf20756f81f021d3951c73f000000004d696e6572476174653030310000000000000000000321003ed59fbae2a8aacb71a9e41639927beaa45e4b50c0d95ef1c8fd640fc74729f9
Why is there a difference in the length, and what is the extra data?