remove "routes", use route hints on invoice instead

[fiatjaf]

So given that LN WALLET sent fromnodes=dd8d3d84886059292845f870c5229f103dd8d7d71d7e9fc6fd52f75a40486d2187 LN SERVICE would return an invoice with many full routes like this:

{
  "currency": "bc",
  "created_at": 1574450520,
  "expiry": 36000,
  "payee": "02bed1812d3824f7cc4ccd38da5d66a29fcfec146fe95e26cd2e0d3f930d653a8d",
  "msatoshi": 2500,
  "amount_msat": "2500msat",
  "min_final_cltv_expiry": 10,
  "features": "",
  "routes": [
    [
      [
        {
          "pubkey": "dd8d3d84886059292845f870c5229f103dd8d7d71d7e9fc6fd52f75a40486d2187",
          "short_channel_id": "596242x2207x0",
          "fee_base_msat": 1000,
          "fee_proportional_millionths": 1,
          "cltv_expiry_delta": 40
        }
      ],
      [
        {
          "pubkey": "6fd53d84886059292845f870c5229f103dd8d7d71d7e9fc6fd52f75a40486d2187",
          "short_channel_id": "601223x2207x0",
          "fee_base_msat": 1000,
          "fee_proportional_millionths": 1,
          "cltv_expiry_delta": 40
        }
      ],
      [
        {
          "pubkey": "40483d84886059292845f870c5229f103dd8d7d71d7e9fc6fd52f75a40486d2187",
          "short_channel_id": "568245x2207x0",
          "fee_base_msat": 1000,
          "fee_proportional_millionths": 1,
          "cltv_expiry_delta": 40
        }
      ]
    ],
    [
      [
        {
          "pubkey": "dd8d3d84886059292845f870c5229f103dd8d7d71d7e9fc6fd52f75a40486d2187",
          "short_channel_id": "522145x2207x0",
          "fee_base_msat": 1000,
          "fee_proportional_millionths": 1,
          "cltv_expiry_delta": 40
        }
      ],
      [
        {
          "pubkey": "7f103d84886059292845f870c5229f103dd8d7d71d7e9fc6fd52f75a40486d2187",
          "short_channel_id": "600000x2207x0",
          "fee_base_msat": 1000,
          "fee_proportional_millionths": 1,
          "cltv_expiry_delta": 40
        }
      ],
      [
        {
          "pubkey": "92923d84886059292845f870c5229f103dd8d7d71d7e9fc6fd52f75a40486d2187",
          "short_channel_id": "593545x2207x0",
          "fee_base_msat": 1000,
          "fee_proportional_millionths": 1,
          "cltv_expiry_delta": 40
        }
      ]
    ]
  ],
  "payment_hash": "13c034cb0aed72c0a2ee54c5678bd13b0bf64017fddd3dd6825205df4c17c6e0",
  "signature": "3044022069e467ff258325c25f59ba7448e466441bb30fe6040f03fc77181672f106ca780220617525cbee5ebb5b9f5ee8f87a8b66c2ddae2ab063b1999b0747ab3df862242e"
}

And every wallet already knows how to parse and handle this (or they should at least).

[fiatjaf]

Now that this is being considered this proposal is making even more sense.

[fiatjaf]

The blinded stuff is making its moves towards BOLT: lightning/bolts#765