Abolish property contentUrl to use property contentUri and/or contentUrn

Not all content should and would be on a HTTP server in real life. URIs and URNs in general should be supported including but not limited to:

Magnet URLs
FTP/FTPS URIs
WebDav URIs
SMB URIs
SFTP URIs
WS URIs
Data URIs such as data:,Hello%20World
URNs

I therefore propose to replace the following attributes:

{
  ...
  "contentHash": "8C9453EF2C0C6F2F94104D16FF0A8105BC6C9793D926457839D8BCADE0888342",
  "contentUrl": "https://test.com/image.png",
  ...
}

With the following:

{
    ...
    "content": {
        "hash": "8C9453EF2C0C6F2F94104D16FF0A8105BC6C9793D926457839D8BCADE0888342",
        "location": {
            "type": "url",
            "identifier": "https://test.com/image.png"
        }
    }
    ...
}

Where $.content.location.type can be any of "url", "urn" or "uri".

Or alternatively:

{
    ...
    "contentHash": "8C9453EF2C0C6F2F94104D16FF0A8105BC6C9793D926457839D8BCADE0888342",
    "contentLocation": {
        "type": "url",
        "identifier": "https://test.com/image.png"
    }
    ...
}

Where $.contentLocation.type can be any of "url", "urn" or "uri".

wordproof / wordproof-timestamp

Abolish property contentUrl to use property contentUri and/or contentUrn #20