Commits on May 19, 2022

1. Use fully qualified path in macro …

   As we do for the rest of the macros use the fully qualified path to
   `fmt` so users of the macro do not have to import it.

   

   tcharding committed May 19, 2022
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2. blockdata: constants: Use wildcard import in unit tests …

   Import with wildcard is applicable in unit tests, use it.

   

   tcharding committed May 19, 2022
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3. Add ChainHash type …

   The Lightning network defines a type called 'chain hash' that is used to
   uniquely represent the various Bitcoin networks as a 32 byte hash value.
   Chain hash is now being used by the DLC folks, as such it is useful to
   have it implemented in rust-bitcoin.
   
   One method of calculating a chain hash is by hashing the genesis block
   for the respective network.
   
   Add a `ChainHash` type that can be used to get the unique identifier of
   each of the 4 Bitcoin networks we support. Add a method that returns
   the chain hash for a network using the double sha256 of the genesis
   block. Do so using hard coded consts and add unit
   tests (regression/sanity) that show these hard code byte arrays match
   the hash of the data we return for the genesis block for the respective
   network.
   
   The chain hash for the main Bitcoin network can be verified from LN
   docs (BOLT 0), add a link to this document.

   

   tcharding committed May 19, 2022
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