anchor.diff:  eth-tx,             Ethereum Tx (RLP),        0x91
   bitcoin-block,      Bitcoin Block,            0xb0
   bitcoin-tx,         Bitcoin Tx,               0xb1
  +zcash-block,        Zcash Block,              0xc0
  +zcash-tx,           Zcash Tx,                 0xc1
   stellar-block,      Stellar Block,            0xd0
   stellar-tx,         Stellar Tx,               0xd1
  
positive.code: sha1,               ,                         0x11
  sha2-256,           ,                         0x12
  sha2-512,           ,                         0x13
  sha3-224,           ,                         0x17
  sha3-256,           ,                         0x16
  sha3-384,           ,                         0x15
  
negative.code: keccak-256,         ,                         0x1B
  keccak-384,         ,                         0x1C
  keccak-512,         ,                         0x1D
  murmur3,            ,                         0x22
  ,, Note: keccak has variable output length. The number specifies the core length
  blake2b,            ,                         0x40
  blake2s,            ,                         0x41
  