diff --git a/src/lib.rs b/src/lib.rs
index 615a2d1..dfe8d55 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,20 +1,61 @@
+use std::convert::Into;
 use chrono::prelude::*;
 
 // TODO review whether a genesis block has a block height of 1 or 0
 
+
+pub enum BlockchainSupported {
+    BTC,
+    BSV,
+    XMR,
+    ETH,
+}
+
 type BlockHeight = i64;
 
-pub struct BlockchainBlockInfo {
+pub struct BlockchainInfo {
     block_period: u64, // in seconds maybe?
 
     latest_block_height: BlockHeight,
     latest_block_time: DateTime<Utc>,
 }
 
-pub fn time_to_blockheight(time: DateTime<Utc>, blockchain: BlockchainBlockInfo) -> BlockHeight {
-    let time_difference = (time - blockchain.latest_block_time).num_seconds();
-    let num_blocks = time_difference / blockchain.block_period as i64;
-    num_blocks + blockchain.latest_block_height
+impl From<BlockchainSupported> for BlockchainInfo {
+    fn from (val: BlockchainSupported) -> Self {
+        match val {
+            BlockchainSupported::BTC => BlockchainInfo {
+                block_period: 10 * 60, // 10 minutes,
+                latest_block_height: 851724,
+                latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 38, 6).unwrap(),
+            },
+            BlockchainSupported::BSV => BlockchainInfo {
+                block_period: 10 * 60, // 10 minutes,
+                latest_block_height: 852792,
+                latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 53, 7).unwrap(),
+            },
+            BlockchainSupported::XMR => BlockchainInfo {
+                block_period: 2 * 60, // 2 minutes,
+                latest_block_height: 3190705,
+                latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 54, 11).unwrap(),
+            },
+            BlockchainSupported::ETH => BlockchainInfo {
+                block_period: 12, // TODO investigate what the story is here... I don't think it's as simple as 12
+                latest_block_height: 20285486,
+                latest_block_time: Utc.with_ymd_and_hms(2024, 7, 11, 19, 53, 59).unwrap(),
+            },
+        }
+    }
+}
+
+pub fn time_to_blockheight_specific_chain(time: DateTime<Utc>, blockchain: BlockchainSupported) -> BlockHeight {
+    let bi: BlockchainInfo = blockchain.into();
+    time_to_blockheight(time, bi)
+}
+
+pub fn time_to_blockheight(time: DateTime<Utc>, bi: BlockchainInfo) -> BlockHeight {
+    let time_difference = (time - bi.latest_block_time).num_seconds();
+    let num_blocks = time_difference / bi.block_period as i64;
+    num_blocks + bi.latest_block_height
 }
 
 #[cfg(test)]
@@ -25,7 +66,7 @@ mod tests {
     fn one_block_time_away() {
         let latest_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 10, 0).unwrap();
         let wanted_future_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 20, 1).unwrap();
-        let blockchain_info = BlockchainBlockInfo {
+        let blockchain_info = BlockchainInfo {
             block_period: 60 * 10, // 10 minutes
             latest_block_height: 1000,
             latest_block_time,
@@ -38,7 +79,7 @@ mod tests {
     fn one_block_time_previous() {
         let latest_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 20, 1).unwrap();
         let wanted_future_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 10, 0).unwrap();
-        let blockchain_info = BlockchainBlockInfo {
+        let blockchain_info = BlockchainInfo {
             block_period: 60 * 10, // 10 minutes
             latest_block_height: 1000,
             latest_block_time,
@@ -51,7 +92,7 @@ mod tests {
     fn negative_block_time() {
         let latest_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 30, 0).unwrap();
         let wanted_negative_block_time = Utc.with_ymd_and_hms(2024, 10, 10, 10, 10, 0).unwrap();
-        let blockchain_info = BlockchainBlockInfo {
+        let blockchain_info = BlockchainInfo {
             block_period: 60 * 10, // 10 minutes
             latest_block_height: 1,
             latest_block_time,