Convert ErgoTree Scans to Coll[Byte]

[sethdusek]

See: ergoplatform/ergo#1781 (comment)

Currently scans for contract address fail, because ergo node expects serialized Coll[Byte] in scans it seems. The easiest way to convert ErgoTree to this format would be something like:

fn ergo_tree_to_scan_bytes(tree: &ErgoTree) -> String {
   base16::encode_lower(Constant::from(tree.sigma_serialize_bytes().unwrap()).sigma_serialize_bytes())
}

edit: I have a fix in my updatecontract branch, and I can confirm that the scans now work. Before ergo node was also throwing an exception in one of the scans.

[sethdusek]

Alternatively, node_interface::address_to_bytes might also work, but I have not tested it

[greenhat]

Oh wow, I was not expecting that. Good catch!

node_interface::address_to_bytes does it via node REST API call, so it's not advised.

[greenhat]

Would you consider implementing it via a trait:

pub trait ToScanBytes {
  fn to_scan_bytes(&self) -> String
}

impl ToScanBytes for ErgoTree {
  ...
}

I think it's more ergonomic than a function.

[sethdusek]

Fixed in #80