First implementation (#1)

Reviewed-on: #1

fixtures/records/proof-inclusion.json

@@ -0,0 +1 @@
+{"format":"scienting-proof/1","index":3,"item":["node","c20cna6","c8e6a553f5ae1377776e86dde6ee7d48a923dea7de417408841ea33b81563272"],"kind":"inclusion","path":["1344d74efcc8182f2a1ac7501fc4a3b888bfd753b1cc9c4c02562d7d51b91a1d","be61b225edd17fe256a73b79b26c2be1e2cc43d370ba4c9e7f0536b12c305650","abe0ffd73517576e3c64411f54f854fb008b13a828695d1f9e3059cfb9bfd2cd","0497554cb70abf31d1bf919cf74b62652e21a5c4ed1875c951971ddada26bc3e","c352582a32865ce563529803845821c0227a85e06490dc069cb945a80fc9cfa9"],"receipt":"y2zw8ctg5s8dp","root":"373a7d860a14b58e5bfa9b9ad3bc916091bcb6db7556f0dbc9c71972a612494d","size":23}