Constant zebra_state::constants::MIN_TRANSPARENT_COINBASE_MATURITY

pub const MIN_TRANSPARENT_COINBASE_MATURITY: u32 = 100; // 100u32

The maturity threshold for transparent coinbase outputs.

“A transaction MUST NOT spend a transparent output of a coinbase transaction from a block less than 100 blocks prior to the spend. Note that transparent outputs of coinbase transactions include Founders’ Reward outputs and transparent Funding Stream outputs.” 7.1