Not sure... however it is define in here - nostr:nevent1qqsdz7asszea9ss58m0ensrkjfmwpcu8mnfcf52eeyl3gtsca0e0v8gpr3mhxue69uhkummnw3ezucnfw33k76twv4ezuum0vd5kzmqzyrh7tw7gx3vqd680fu0hew8slsqpf29hgd4q5p7lmt5akf5hwkldjqcyqqqqqqg0sqs39