block.rs

// Rust Elements Library
// Written in 2018 by
//   Andrew Poelstra <apoelstra@blockstream.com>
//
// To the extent possible under law, the author(s) have dedicated all
// copyright and related and neighboring rights to this software to
// the public domain worldwide. This software is distributed without
// any warranty.
//
// You should have received a copy of the CC0 Public Domain Dedication
// along with this software.
// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
//

//! # Blocks
//!

use std::io;

use bitcoin::hashes::{Hash, sha256};
#[cfg(feature = "serde")] use serde::{Deserialize, Deserializer, Serialize, Serializer};
#[cfg(feature = "serde")] use std::fmt;

use crate::dynafed;
use crate::Transaction;
use crate::encode::{self, Encodable, Decodable, serialize};
use crate::{BlockHash, Script, TxMerkleNode, VarInt};

/// Data related to block signatures
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub enum ExtData {
    /// Liquid v1-style static `signblockscript` and witness
    Proof {
        /// Block "public key"
        challenge: Script,
        /// Satisfying witness to the above challenge, or nothing
        solution: Script,
    },
    /// Dynamic federations
    Dynafed {
        /// Current dynamic federation parameters
        current: dynafed::Params,
        /// Proposed dynamic federation parameters
        proposed: dynafed::Params,
        /// Witness satisfying the current blocksigning script
        signblock_witness: Vec<Vec<u8>>,
    },
}

#[cfg(feature = "serde")]
impl<'de> Deserialize<'de> for ExtData {
    fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Self, D::Error> {
        use serde::de;

        enum Enum { Unknown, Challenge, Solution, Current, Proposed, Witness }
        struct EnumVisitor;

        impl<'de> de::Visitor<'de> for EnumVisitor {
            type Value = Enum;

            fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.write_str("a field name")
            }

            fn visit_str<E: de::Error>(self, v: &str) -> Result<Self::Value, E> {
                match v {
                    "challenge" => Ok(Enum::Challenge),
                    "solution" => Ok(Enum::Solution),
                    "current" => Ok(Enum::Current),
                    "proposed" => Ok(Enum::Proposed),
                    "signblock_witness" => Ok(Enum::Witness),
                    _ => Ok(Enum::Unknown),
                }
            }
        }

        impl<'de> Deserialize<'de> for Enum {
            fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Self, D::Error> {
                d.deserialize_str(EnumVisitor)
            }
        }

        struct Visitor;
        impl<'de> de::Visitor<'de> for Visitor {
            type Value = ExtData;

            fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.write_str("block header extra data")
            }

            fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
            where
                A: de::MapAccess<'de>,
            {
                let mut challenge = None;
                let mut solution = None;
                let mut current = None;
                let mut proposed = None;
                let mut witness = None;

                loop {
                    match map.next_key::<Enum>()? {
                        Some(Enum::Unknown) => {
                            map.next_value::<de::IgnoredAny>()?;
                        },
                        Some(Enum::Challenge) => challenge = Some(map.next_value()?),
                        Some(Enum::Solution) => solution = Some(map.next_value()?),
                        Some(Enum::Current) => current = Some(map.next_value()?),
                        Some(Enum::Proposed) => proposed = Some(map.next_value()?),
                        Some(Enum::Witness) => witness = Some(map.next_value()?),
                        None => { break; }
                    }
                }

                let challenge_missing = challenge.is_some();
                if let (Some(chal), Some(soln)) = (challenge, solution) {
                    Ok(ExtData::Proof {
                        challenge: chal,
                        solution: soln,
                    })
                } else if let (Some(cur), Some(prop), Some(wit))
                    = (current, proposed, witness)
                {
                    Ok(ExtData::Dynafed {
                        current: cur,
                        proposed: prop,
                        signblock_witness: wit,
                    })
                } else if challenge_missing {
                    Err(de::Error::missing_field("challenge"))
                } else {
                    Err(de::Error::missing_field("solution"))
                }
            }
        }

        static FIELDS: &[&str] = &[
            "challenge",
            "solution",
            "current",
            "proposed",
            "signblock_witness",
        ];
        d.deserialize_struct("ExtData", FIELDS, Visitor)
    }
}

#[cfg(feature = "serde")]
impl Serialize for ExtData {
    fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error> {
        use serde::ser::SerializeStruct;

        match *self {
            ExtData::Proof { ref challenge, ref solution } => {
                let mut st = s.serialize_struct("ExtData", 2)?;
                st.serialize_field("challenge", challenge)?;
                st.serialize_field("solution", solution)?;
                st.end()
            },
            ExtData::Dynafed { ref current, ref proposed, ref signblock_witness } => {
                let mut st = s.serialize_struct("ExtData", 3)?;
                st.serialize_field("current", current)?;
                st.serialize_field("proposed", proposed)?;
                st.serialize_field("signblock_witness", signblock_witness)?;
                st.end()
            },
        }
    }
}

impl Encodable for ExtData {
    fn consensus_encode<S: io::Write>(&self, mut s: S) -> Result<usize, encode::Error> {
        Ok(match *self {
            ExtData::Proof {
                ref challenge,
                ref solution,
            } => {
                challenge.consensus_encode(&mut s)? +
                solution.consensus_encode(&mut s)?
            },
            ExtData::Dynafed {
                ref current,
                ref proposed,
                ref signblock_witness,
            } => {
                current.consensus_encode(&mut s)? +
                proposed.consensus_encode(&mut s)? +
                signblock_witness.consensus_encode(&mut s)?
            },
        })
    }
}

impl Default for ExtData {
    fn default() -> ExtData {
        ExtData::Dynafed {
            current: dynafed::Params::Null,
            proposed: dynafed::Params::Null,
            signblock_witness: vec![],
        }
    }
}

/// Elements block header
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct BlockHeader {
    /// Version - should be 0x20000000 except when versionbits signalling
    pub version: u32,
    /// Previous blockhash
    pub prev_blockhash: BlockHash,
    /// Transaction Merkle root
    pub merkle_root: TxMerkleNode,
    /// Block timestamp
    pub time: u32,
    /// Block height
    pub height: u32,
    /// Block signature and dynamic federation-related data
    pub ext: ExtData,
}
serde_struct_impl!(BlockHeader, version, prev_blockhash, merkle_root, time, height, ext);

impl BlockHeader {
    /// Return the block hash.
    pub fn block_hash(&self) -> BlockHash {

        let version = if let ExtData::Dynafed { .. } = self.ext {
            self.version | 0x8000_0000
        } else {
            self.version
        };

        // Everything except the signblock witness goes into the hash
        let mut enc = BlockHash::engine();
        version.consensus_encode(&mut enc).unwrap();
        self.prev_blockhash.consensus_encode(&mut enc).unwrap();
        self.merkle_root.consensus_encode(&mut enc).unwrap();
        self.time.consensus_encode(&mut enc).unwrap();
        self.height.consensus_encode(&mut enc).unwrap();
        match self.ext {
            ExtData::Proof { ref challenge, .. } => {
                challenge.consensus_encode(&mut enc).unwrap();
            },
            ExtData::Dynafed { ref current, ref proposed, .. } => {
                current.consensus_encode(&mut enc).unwrap();
                proposed.consensus_encode(&mut enc).unwrap();
            },
        }
        BlockHash::from_engine(enc)
    }

    /// Returns true if this is a block with dynamic federations enabled.
    pub fn is_dynafed(&self) -> bool {
        if let ExtData::Dynafed {
            ..
        } = self.ext
        {
            true
        } else {
            false
        }
    }

    /// Remove the witness data of the block header.
    /// This is all the data that can be removed without changing
    /// the block hash.
    pub fn clear_witness(&mut self) {
        match &mut self.ext {
            ExtData::Proof { ref mut solution, .. } => {
                *solution = Script::new();
            },
            ExtData::Dynafed { ref mut signblock_witness, .. } => {
                signblock_witness.clear();
            },
        }
    }

    /// Calculate the root of the dynafed params. Returns [None] when not dynafed.
    pub fn calculate_dynafed_params_root(&self) -> Option<sha256::Midstate> {
        match self.ext {
            ExtData::Proof { .. } => None,
            ExtData::Dynafed { ref current, ref proposed, .. } => {
                let leaves = [
                    current.calculate_root().into_inner(),
                    proposed.calculate_root().into_inner(),
                ];
                Some(crate::fast_merkle_root::fast_merkle_root(&leaves[..]))
            }
        }
    }

    /// Get the current dynafed parameters if it's a dynafed header.
    pub fn dynafed_current(&self) -> Option<&dynafed::Params> {
        match self.ext {
            ExtData::Dynafed { ref current, .. } => Some(current),
            ExtData::Proof { .. } => None,
        }
    }

    /// Get the proposed dynafed parameters if it's a dynafed header.
    pub fn dynafed_proposed(&self) -> Option<&dynafed::Params> {
        match self.ext {
            ExtData::Dynafed { ref proposed, .. } => Some(proposed),
            ExtData::Proof { .. } => None,
        }
    }
}

impl Encodable for BlockHeader {
    fn consensus_encode<S: io::Write>(&self, mut s: S) -> Result<usize, encode::Error> {
        let version = if let ExtData::Dynafed { .. } = self.ext {
            self.version | 0x8000_0000
        } else {
            self.version
        };

        Ok(version.consensus_encode(&mut s)? +
        self.prev_blockhash.consensus_encode(&mut s)? +
        self.merkle_root.consensus_encode(&mut s)? +
        self.time.consensus_encode(&mut s)? +
        self.height.consensus_encode(&mut s)? +
        self.ext.consensus_encode(&mut s)?)
    }
}

impl Decodable for BlockHeader {
    fn consensus_decode<D: io::Read>(mut d: D) -> Result<Self, encode::Error> {
        let mut version: u32 = Decodable::consensus_decode(&mut d)?;
        let is_dyna = if version >> 31 == 1 {
            version &= 0x7fff_ffff;
            true
        } else {
            false
        };

        Ok(BlockHeader {
            version,
            prev_blockhash: Decodable::consensus_decode(&mut d)?,
            merkle_root: Decodable::consensus_decode(&mut d)?,
            time: Decodable::consensus_decode(&mut d)?,
            height: Decodable::consensus_decode(&mut d)?,
            ext: if is_dyna {
                ExtData::Dynafed {
                    current: Decodable::consensus_decode(&mut d)?,
                    proposed: Decodable::consensus_decode(&mut d)?,
                    signblock_witness: Decodable::consensus_decode(&mut d)?,
                }
            } else {
                ExtData::Proof {
                    challenge: Decodable::consensus_decode(&mut d)?,
                    solution: Decodable::consensus_decode(&mut d)?,
                }
            },
        })
    }
}

/// Elements block
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct Block {
    /// Header of the block
    pub header: BlockHeader,
    /// Complete list of transaction in the block
    pub txdata: Vec<Transaction>,
}
serde_struct_impl!(Block, header, txdata);
impl_consensus_encoding!(Block, header, txdata);

impl Block {
    /// Return the block hash.
    pub fn block_hash(&self) -> BlockHash {
        self.header.block_hash()
    }

    /// Get the size of the block
    #[deprecated(since = "0.19.1", note = "Please use `Block::size` instead.")]
    pub fn get_size(&self) -> usize {
        self.size()
    }

    /// Get the size of the block
    pub fn size(&self) -> usize {
        // The size of the header + the size of the varint with the tx count + the txs themselves
        let base_size = serialize(&self.header).len() + VarInt(self.txdata.len() as u64).len();
        let txs_size: usize = self.txdata.iter().map(Transaction::size).sum();
        base_size + txs_size
    }

    /// Get the weight of the block
    #[deprecated(since = "0.19.1", note = "Please use `Block::weight` instead.")]
    pub fn get_weight(&self) -> usize {
        self.weight()
    }

    /// Get the weight of the block
    pub fn weight(&self) -> usize {
        let base_weight = 4 * (serialize(&self.header).len() + VarInt(self.txdata.len() as u64).len());
        let txs_weight: usize = self.txdata.iter().map(Transaction::weight).sum();
        base_weight + txs_weight
    }
}

#[cfg(test)]
mod tests {
    use crate::Block;
    use crate::hashes::hex::FromHex;

    use super::*;

    const SIMPLE_BLOCK: &'static str = "\
             00000020a66e4a4baff69735267346d12e59e8a0da848b593813554deb16a6f3\
             6cd035e9aab0e2451724598471dd4e45f0dca40ca5f4ac62e61957e50925af08\
             59891fcc8842805b020000000151000102000000010100000000000000000000\
             00000000000000000000000000000000000000000000ffffffff03520101ffff\
             ffff0201230f4f5d4b7c6fa845806ee4f67713459e1b69e8e60fcee2e4940c7a\
             0d5de1b201000000000000000000016a01230f4f5d4b7c6fa845806ee4f67713\
             459e1b69e8e60fcee2e4940c7a0d5de1b201000000000000000000266a24aa21\
             a9ed94f15ed3a62165e4a0b99699cc28b48e19cb5bc1b1f47155db62d63f1e04\
             7d45000000000000012000000000000000000000000000000000000000000000\
             000000000000000000000000000000\
             ";
    const DYNAFED_BLOCK: &'static str = "\
            000000a0da9d569617d1d65c3390a01c18c4fa7c4d0f4738b6fc2b5c5faf2e8a\
            463abbaa46eb9123808e1e2ff75e9472fa0f0589b53b7518a69d3d6fcb9228ed\
            345734ea06b9c45d070000000122002057c555a91edf9552282d88624d1473c2\
            75e64b7218870eb8fb0335b442976b8d02010000fbee9cea00d8efdc49cfbec3\
            28537e0d7032194de6ebf3cf42e5c05bb89a08b100040047304402206f55bc87\
            1387a9840489d47624b02995e774e3b70fed56d1eb43a9a53d4fd3e102201e1c\
            bfbbd1079f5bea3bc216882d3fefbf6f27aa761820d3a88f12e5a5ea7ff00148\
            3045022100c072816f6561e73ee6c0ae32d55c3eec4da73b035425e4eb05ab50\
            772591b4360220311bf295010094a489d9b280d9dafb724d776a1d99b9ede31c\
            4b59bc2095c5c30169522103cadff18e928133df2e670a3715c4e7a81d357de3\
            6ddaa5016628e70a3e6a452f21021f0d8638c413ef7769cd711ce84c8f192f5a\
            85f0fd6d8e63ddb4d2cf6740b23b210296db75c11ea3a292a372f6c94f5013ea\
            eb379f701857a702f3b83f88da21be6f53ae0102000000010100000000000000\
            00000000000000000000000000000000000000000000000000ffffffff035701\
            01ffffffff020137c495f58d698979ff9124e8c7455fe79b13ddb96afa25c458\
            94eb059868a8c001000000000000000000016a0137c495f58d698979ff9124e8\
            c7455fe79b13ddb96afa25c45894eb059868a8c001000000000000000000266a\
            24aa21a9ed94f15ed3a62165e4a0b99699cc28b48e19cb5bc1b1f47155db62d6\
            3f1e047d45000000000000012000000000000000000000000000000000000000\
            000000000000000000000000000000000000\
            ";

    #[cfg(feature = "serde-feature")]
    #[test]
    fn blockheader_serde() {
        let block: Block = hex_deserialize!(&SIMPLE_BLOCK);
        roundtrip_header(&block.header);
        let block: Block = hex_deserialize!(&DYNAFED_BLOCK);
        roundtrip_header(&block.header);
    }
    #[cfg(feature = "serde-feature")]
    fn roundtrip_header(header: &BlockHeader) {
        let header_ser = serde_json::to_string(header).unwrap();
        let header_deser: BlockHeader = serde_json::from_str(&header_ser).unwrap();

        assert_eq!(&header_deser, header);
        let header_ser = serde_cbor::to_vec(header).unwrap();
        let header_deser: BlockHeader = serde_cbor::from_slice(&header_ser).unwrap();

        assert_eq!(&header_deser, header);
    }

    #[test]
    fn block() {
        // Simple block with only coinbase output
        let block: Block = hex_deserialize!(SIMPLE_BLOCK);

        assert_eq!(
            block.block_hash().to_string(),
            "287ca47e8da47eb8c28d870663450bb026922eadb30a1b2f8293e6e9d1ca5322"
        );
        assert_eq!(block.header.version, 0x20000000);
        assert_eq!(block.header.height, 2);
        assert_eq!(block.txdata.len(), 1);
        assert_eq!(block.size(), serialize(&block).len());
        assert_eq!(block.weight(), 1089);

        // Block with 3 transactions ... the rangeproofs are very large :)
        let block: Block = hex_deserialize!(
            "000000207e3dba98460e4136659f0fccf3e59338dfe53ed5f094fb0bb94d771c\
            48341854d875900105c87e5dd46c740cb1129c06f8f4007e868f61b25e37cffa9\
            46c718d8742805b01000000015100030200000001010000000000000000000000\
            000000000000000000000000000000000000000000ffffffff03510101fffffff\
            f0201230f4f5d4b7c6fa845806ee4f67713459e1b69e8e60fcee2e4940c7a0d5d\
            e1b2010000000000009b64001976a914608c0ea8194a8ceb57f0196f44a6b48a5\
            4fc065988ac01230f4f5d4b7c6fa845806ee4f67713459e1b69e8e60fcee2e494\
            0c7a0d5de1b201000000000000000000266a24aa21a9ed8f8a98e5623643b2416\
            7266c2648ead4a50d18b0491c6f34e11398aaee0ca6e800000000000001200000\
            00000000000000000000000000000000000000000000000000000000000000000\
            00000020000000001eb04b68e9a26d116046c76e8ff47332fb71dda90ff4bef53\
            70f25226d3bc09fc0000000000feffffff0201230f4f5d4b7c6fa845806ee4f67\
            713459e1b69e8e60fcee2e4940c7a0d5de1b20100000002540bd71c001976a914\
            48633e2c0ee9495dd3f9c43732c47f4702a362c888ac01230f4f5d4b7c6fa8458\
            06ee4f67713459e1b69e8e60fcee2e4940c7a0d5de1b2010000000000000ce400\
            0000000000020000000101f23ceddac67cfbbc997199daa651384d0746fb2a548\
            2b8c8629ba8df4b788f75000000006b483045022100e0feb3e2f292000d67e24b\
            821d87c9532230dac1de428d6a0068c9f416583abf02200e76f072788dd411b23\
            27267cd91c6b1659809598cd4fae35be475efe1e4bbad01210201e15c23c02165\
            2d07c1557b607ea0379fca0462aca840d6c33c4d4927524547feffffff030b604\
            24a423335923c15ae387d95d4f80d944722020bfa55b9f0a0e67579e3c13c081c\
            4f215239c77456d121eb73bd9914a9a6398fe369b4eb8f88a5f78e257fcaa3033\
            01ee46349950886ae115c9556607fcda9381c2f72368f4b5286488c62aa0b0819\
            76a9148bb6c4d5814d43fefb9e330575e326632136389c88ac0bd436b0539f549\
            7af792d7cb281f09b73d8a5abc198b3ce6239d79e68893e5e5d0923899fd35071\
            ba8a209d85b556d5747b6c35539c3b2f8631a27c0d477a1f45a603d1d350b8cbf\
            900f7666da66541bf6252fc4c162141ad49c670884c93c57db6ba1976a9148c7a\
            b6e0fca387d03643d4846f708bf39d47c1e988ac01230f4f5d4b7c6fa845806ee\
            4f67713459e1b69e8e60fcee2e4940c7a0d5de1b2010000000000008e80000000\
            0000000000000043010001dc65ae13f76fde4a7172e0fb380b1a5cc8dc88eaa06\
            59e638a25eac8ae30d79bf93eb7e487eeee323e4ac8e3a2fe6523bdeba6acce32\
            b9b085f2286174c04655fd6c0a6020000000000000000178ad016b3e5d8165423\
            e56d8b37e3eaee96009b2f970043ccf65d61b5c3c1e1ef343e0c479bdba442717\
            dc861c9591566010240b9d4607efb9252a5fcef05edf640e0bb6b606729246ad0\
            7baa49d0d3b52042c65a03ca737744e45b2d2d6d177c36569ae9d6eb4437305b1\
            69bbc59f85cabff3bc49a2d6d08c177cce3121a509d3c47961bd22e35c932b79d\
            4ec5ccaf913fac04034bfebdadbc4ff3127af96344b02ee6b967bb08326cbe6a4\
            e1c924485e64a8c0fdf70b98c99f38acaa15aa0adb2b5b7335ed5502443891bcd\
            657310347cbd928f40f38f1dec087a2b947c9cf7d304798f77bbc4a2c843796b2\
            d49acce91de4e88a0a9c261277df28ffc3320d7f7d64790f592ddded48a1068ef\
            88271395fa5606389ef90856ddd6bd6710a8d27e0147983b5dde2a7efae44e83a\
            d02a3c3da04be43d5f2c05c205f1e17b48554c2177670f46dbb6600bd2e6c75dd\
            5ea2e1072c5f22483dcf05d8124e3f9063a5ddb179a29c23a2d15d6e89f2192f0\
            3dae5938f66fcdcff000c5a96ffd2920f23881880af72153c96a56dd80c218bb4\
            8b44a18e54a8050ff32c869c1264ee574cdb4002f86e0779c724d11dc4a768dbe\
            c1bd22054886f1fdf2e7347e4c247b829159d1375f881c6ce0a5c4da8534000e7\
            fec3a980afb1edc99b725c29de80f260dcf144c873bf589ae1812ef6cb05f2234\
            f9c66c23e874a0d5d0dc52f2209e015bbcf74ee449a397f6b0318c915b7e58dea\
            5904abbe35285e90ccf548ad1f3f52f60c3b19b3cd67644d633e68aef42d8ef17\
            82f22a8edd0620f55f29070720ca7a078ac83e87b9ebd2783ecad17dd854ef1bb\
            d319f1a6d3a1e4931f9097422f5a3c4af037b99e06c7610ee61102c6eea763af1\
            08e9a16b93b2dc0891658d5c6a197df6aae9b306b2c895d21c79cb6cb6dd85b40\
            18b0a9fe7468336e3907eb4adcaf930cacc97e8e951d2d6b25744a4143679bad1\
            f31b210c9a2ed54b80d8f5d7dc1f1c985681534c1926920cd683d95dca7e8ea28\
            5f9906d2e89cd8bfa76a98e38ee4b5152522d55f79610fe8d5278fe6ed5866b5d\
            a4dcf330ea84307c34f30e1a66eb1934dafebb0074fc27c2ff73d8c0bae8416cc\
            87bf611f81119aba9e2a911beaf3ac9507e621fc1ed1cf15dfb31408cf55e2bfd\
            d2880db2d3489a336d6f8348347648d882f9f376331e469e809115c6cc82468f3\
            63c910673e9ded172ded90a369e1cdd135676f623e11a1531ed221177812b1ef0\
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            b66549a9aa57948fbd2f183fcd951b1d2305bffd6c0a602000000000000000016\
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            b33cebed5588d88adde607f6bca14f0279ce35126d403ffa50f288c87f528c197\
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            2b30c36adf8fdb8317c33df05f6413447f4985d12e9012629df09dc8f43373a6d\
            0db4b0048453a6f1ec662472c77a30d5cf4ac7084f736d0d598c251f2aefc9860\
            52fbf12a657885d7140ad36b07c63ab86388a2be12d943747f3f29ef9f2e11e14\
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            1418b4f888c9a7a566e32811936bf6950bbf786b86c41c28f2045d31953fcd15f\
            179e7bc00c72870890537921f7deff82270b0e44b88720aa738f60a85567deb7c\
            90b0c2444467621e53e1c079436d31d3d0b34dd237fc281eb9d87175237a9a433\
            142db4bb7f8c4cb6a34e2dc73f074045d216695ce88ef68e18564c935c9cbd902\
            e939655c258de2ab78def8746bffd972083afce3b6881b7147262e1a44e022468\
            9fafa1a3cb823c8da6eb7df091bec0638bf728b7b10aa95f2bce512ec8d325293\
            8d2eb77b44ace7a2f976588032cac5af670f9e5ca25cb0721bc1baec26f9c3a9f\
            41b02fb62997d6cb0a01314845e9d0e78139ea49f2ead8736e0000"
        );

        assert_eq!(
            block.block_hash().to_string(),
            "e935d06cf3a616eb4d551338598b84daa0e8592ed14673263597f6af4b4a6ea6"
        );
        assert_eq!(block.header.version, 0x20000000);
        assert_eq!(block.header.height, 1);
        assert_eq!(block.txdata.len(), 3);
        assert_eq!(block.size(), serialize(&block).len());

        // 2-of-3 signed block from Liquid integration tests
        let block: Block = hex_deserialize!(
            "0000002069de100c1bae40e1cf8819bd18282e4ca370f62123c8ea2c60836984\
             ba052270ee0cb6e5458591ac157ad414a111db4d34cedffc22e096291f7b4b3c\
             8de3f69f8d53815b03000000695221031c25c60ef342990d9bf75425c1dc2392\
             b5e206268d9d35044b731735db230c38210319c5a32a8ae698aaf1246784f542\
             31d8d20f81b91c31353214538b827d718c8d210399d55e0a7fb30281da074dfb\
             bb2654cacc2d03289ba79feae702ad6dbb542aab53ae9000463044022029bbe1\
             79c2f0d8e6d1576869cea19ef439d0e52373f7efab77cd6ccb551b29f6022042\
             baa3c17fccfb265ee878059b6cb85d40b976a30495c6ca14b7ffe6d1d8757247\
             3045022100da88bb6fa1ecf3060ad7c8347eaa1a7ef8c9ae27a8b0136cff9099\
             94ca409f9e022068ddf3090bde1e04deda04f762eb35858d7dfc17e156bfc1c8\
             131ca07a349dda01020000000101000000000000000000000000000000000000\
             0000000000000000000000000000ffffffff03530101ffffffff02018dc25a05\
             5e773e7e91d4678053ebc702cce47f07b29f3ebd7c4b34cd30fb240201000000\
             000000000000016a018dc25a055e773e7e91d4678053ebc702cce47f07b29f3e\
             bd7c4b34cd30fb240201000000000000000000266a24aa21a9ed94f15ed3a621\
             65e4a0b99699cc28b48e19cb5bc1b1f47155db62d63f1e047d45000000000000\
             0120000000000000000000000000000000000000000000000000000000000000\
             00000000000000"
        );

        assert_eq!(
            block.block_hash().to_string(),
            "bcc6eb2ab6c97b9b4590825b9136f100b22e090c0469818572b8b93926a79f28"
        );
        assert_eq!(block.header.version, 0x20000000);
        if let ExtData::Proof { challenge, solution } = block.header.ext {
            assert_eq!(challenge.len(), 1 + 3 * 34 + 2);
            assert_eq!(solution.len(), 144);
        } else {
            panic!("dynafed test vector was parsed as non-dynafed");
        }
    }

    #[test]
    fn dynafed_block() {
        // Copied from elements RPC during a functionary integration test run
        let block: Block = hex_deserialize!(DYNAFED_BLOCK);

        // Test that this is a block with compact current params and null proposed params
        if let ExtData::Dynafed { current, proposed, .. } = block.clone().header.ext {
            if let dynafed::Params::Compact { signblock_witness_limit, .. } = current {
                assert_eq!(signblock_witness_limit, 258);
            } else {
                panic!("Current block dynafed params not compact");
            }
            if let dynafed::Params::Null { .. } = proposed {
                /* pass */
            } else {
                panic!("Proposed block dynafed params not compact");
            }
        } else {
            panic!("No dynafed params");
        }

        assert_eq!(
            block.block_hash().to_string(),
            "4961df970cf12d789383974e6ab439f780d956b5a50162ca9d281362e46c605a"
        );
        assert_eq!(block.header.version, 0x20000000);

        // Full current and proposal
        let block: Block = hex_deserialize!("\
            000000a01ecf88cda4d9e6339109c685417c526e8316fe0d3ea058765634dcbb\
            205d3081bd83073b1f1793154ab820c70a1fda32a0d45bb0e1f40c0c61ae0350\
            7f49c293debcc45d1400000002220020a6794de47a1612cc94c1b978d5bd1b25\
            873f4cab0b1a76260b0b8af9ad954dc74b0100002200204ae81572f06e1b88fd\
            5ced7a1a000945432e83e1551e6f721ee9c00b8cc33260015100022200204cb4\
            0d59d6e1bbe963f3a63021b0d7d5474b87206978a1129fbffc4d1c1cf7e44b01\
            00002200204ae81572f06e1b88fd5ced7a1a000945432e83e1551e6f721ee9c0\
            0b8cc332600151000500483045022100ab2203a8a68d7eca8a3a0fac91e7c780\
            2656d937535800da82f7102e1c06f7b80220576f004cb14b95178c71e36bf947\
            bfea496b00b66c18d2eb8febf46362d50e2b0147304402202d4630887d661a50\
            b76b7b32555fd76906ad298ce24483df42310ffbf62d451802200e0d64069e58\
            047c271c1b4051c1ff3d1cba7d32e56abb0d8b8bc30e1bed075b014830450221\
            00c6b196967c661c4543802a895ae731af44862e75d9e3c65b8efdd668727a34\
            af022041ff4d67029052eb6305d25d0fc4813d21a939ff5316a12562d0c90389\
            76f8e1016953210296db75c11ea3a292a372f6c94f5013eaeb379f701857a702\
            f3b83f88da21be6f21021f0d8638c413ef7769cd711ce84c8f192f5a85f0fd6d\
            8e63ddb4d2cf6740b23b2103cadff18e928133df2e670a3715c4e7a81d357de3\
            6ddaa5016628e70a3e6a452f53ae010200000001010000000000000000000000\
            000000000000000000000000000000000000000000ffffffff0401140101ffff\
            ffff020137c495f58d698979ff9124e8c7455fe79b13ddb96afa25c45894eb05\
            9868a8c001000000000000000000016a0137c495f58d698979ff9124e8c7455f\
            e79b13ddb96afa25c45894eb059868a8c001000000000000000000266a24aa21\
            a9ed94f15ed3a62165e4a0b99699cc28b48e19cb5bc1b1f47155db62d63f1e04\
            7d45000000000000012000000000000000000000000000000000000000000000\
            000000000000000000000000000000\
        ");

        // Test that this is a block with full current params and full proposed params
        if let ExtData::Dynafed { current, proposed, .. } = block.clone().header.ext {
            if let dynafed::Params::Full { .. } = current {
                /* pass */
            } else {
                panic!("Current block dynafed params not full");
            }
            if let dynafed::Params::Full { .. } = proposed {
                /* pass */
            } else {
                panic!("Proposed block dynafed params not full");
            }
        } else {
            panic!("No dynafed params");
        }
        assert_eq!(
            block.block_hash().to_string(),
            "e9a5176b1690a448f76fb691ab4d516e60e13a6e7a49454c62dbf0d611ffcce7"
        );
    }

    #[test]
    fn test_failed_block() {
        let block_str = include_str!("../tests/data/failedblock.hex");

        let bytes = Vec::<u8>::from_hex(block_str).unwrap();
        let _block = encode::deserialize::<Block>(&bytes).unwrap();
    }
}