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BOLT 11: change r to hold multiple entries.

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Allows us to put multiple routes in; there was previous confusion.

Closes: #215
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-08-03 10:53:21 +09:30
parent 3274087bd4
commit a49543e8ea
1 changed files with 18 additions and 16 deletions
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34
11-payment-encoding.md
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@ -102,8 +102,7 @@ Currently defined Tagged Fields are:
* `h` (23): `data_length` 52. 256-bit description of purpose of payment (SHA256). This is used to commit to an associated description which is too long to fit, such as may be contained in a web page.
* `x` (6): `data_length` variable. `expiry` time in seconds (big-endian). Default is 3600 (1 hour) if not specified.
* `f` (9): `data_length` variable, depending in version. Fallback on-chain address: for bitcoin, this starts with a 5 bit `version`; a witness program or P2PKH or P2SH address.
* `r` (3): extra routing information. This should be appended to the route
to allow routing to non-public nodes; there may be more than one of these.
* `r` (3): `data_length` variable. One or more entries containing extra routing information for a private route; there may be more than one `r` field, too.
* `pubkey` (264 bits)
* `short_channel_id` (64 bits)
* `fee` (64 bits, big-endian)
@ -132,13 +131,15 @@ A writer MAY include one or more `f` fields. For bitcoin payments, a writer MUST
a public key hash, or `18` followed by a script hash.
A writer MUST include at least one `r` field if it does not have a
public channel associated with its public key. The `pubkey` is the
public channel associated with its public key. The `r` field MUST contain
one or more ordered entries, indicating the forward route from a
public node to the final destination. For each entry, the `pubkey` is the
node ID of the start of the channel, `short_channel_id` is the short channel ID
field to identify the channel, `fee` is the total fee required to use
that channel to send `amount` to the final node, specified in 10^-11
currency units, and `cltv_expiry_delta` is the block delta required
by the channel. A writer MAY include more than one `r` field to
indicate a sequence of non-public channels to traverse.
provide multiple routing options.
A writer MUST pad field data to a multiple of 5 bits, using zeroes.
@ -147,8 +148,8 @@ the most-preferred field first, followed by less-preferred fields in
order.
A reader MUST skip over unknown fields, an `f` field with unknown
`version`, or a `p`, `h`, `n` or `r` field which does not have `data_length` 52,
52, 53 or 82 respectively.
`version`, or a `p`, `h`, or `n` field which does not have `data_length` 52,
52, or 53 respectively.
A reader MUST check that the SHA-2 256 in the `h` field exactly
matches the hashed description.
@ -190,8 +191,7 @@ will be ignored by readers.
The `r` field allows limited routing assistance: as specified it only
allows minimum information to use private channels, but it could also
assist in future partial-knowledge routing. Future formats are
possible by altering the length, too.
assist in future partial-knowledge routing.
# Payer / Payee Interactions
@ -298,8 +298,8 @@ Breakdown:
* `qh84fmvn2klvglsjxfy0vq2mz6t9kjfzlxfwgljj35w2kwa60qv49k7jlsgx43yhs9nuutllkhhnt090mmenuhp8ue33pv4klmrzlcqp`: signature
* `us2s2r`: Bech32 checksum
> ### On mainnet, with fallback address 1RustyRX2oai4EYYDpQGWvEL62BBGqN9T with extra routing info to get to node 029e03a901b85534ff1e92c43c74431f7ce72046060fcf7a95c37e148f78c77255
> lnbc20m1pvjluezhp58yjmdan79s6qqdhdzgynm4zwqd5d7xmw5fk98klysy043l2ahrqspp5qqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqypqfpp3qjmp7lwpagxun9pygexvgpjdc4jdj85frzjq20q82gphp2nflc7jtzrcazrra7wwgzxqc8u7754cdlpfrmccae92qgzqvzq2ps8pqqqqqqqqqqqq9qqqvs2wmtfjy8myg3ha79lu9z9yv76sllvvpzpnp3xss3k62x2lw95u4hfm6ttg4vm647exd5k4ljrcqgazzh37x5unf6hgzkx8ayd5dg5cpta2dqs
> ### On mainnet, with fallback address 1RustyRX2oai4EYYDpQGWvEL62BBGqN9T with extra routing info to go via nodes 029e03a901b85534ff1e92c43c74431f7ce72046060fcf7a95c37e148f78c77255 then 039e03a901b85534ff1e92c43c74431f7ce72046060fcf7a95c37e148f78c77255
> lnbc20m1pvjluezpp5qqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqypqhp58yjmdan79s6qqdhdzgynm4zwqd5d7xmw5fk98klysy043l2ahrqsfpp3qjmp7lwpagxun9pygexvgpjdc4jdj85fr9yq20q82gphp2nflc7jtzrcazrra7wwgzxqc8u7754cdlpfrmccae92qgzqvzq2ps8pqqqqqqqqqqqq9qqqvpeuqafqxu92d8lr6fvg0r5gv0heeeqgcrqlnm6jhphu9y00rrhy4grqszsvpcgpy9qqqqqqqqqqqq7qqzqfnlkwydm8rg30gjku7wmxmk06sevjp53fmvrcfegvwy7d5443jvyhxsel0hulkstws7vqv400q4j3wgpk4crg49682hr4scqvmad43cqd5m7tf
Breakdown:
@ -308,13 +308,15 @@ Breakdown:
* `1`: Bech32 separator
* `pvjluez`: timestamp (1496314658)
* `p`: payment preimage...
* `r`: tagged field: route information
* `zj`: `data_length` (`z` = 2, `j` = 18. 2 * 32 + 18 = 82)
`q20q82gphp2nflc7jtzrcazrra7wwgzxqc8u7754cdlpfrmccae92qgzqvzq2ps8pqqqqqqqqqqqq9qqqv`: pubkey `029e03a901b85534ff1e92c43c74431f7ce72046060fcf7a95c37e148f78c77255`, `short_channel_id` 0102030405060708, `fee` 20 millisatoshi, `cltv_expiry_delta` 3.
* `f`: tagged field: fallback address...
* `h`: tagged field: hash of description...
* `jtf8rrkd7dujvdvrxhuk5a0tt9x9qh0t95jemn4tpen9y3nn7yt8jrmlyzffjh0hue8edkkq3090hruc8shpfu6wk4chfdvdusakycgp`: signature
* `qtn4sp`: Bech32 checksum
* `f`: tagged field: fallback address
* `pp`: `data_length` (`p` = 1. 1 * 32 + 1 == 33)
* `3qjmp7lwpagxun9pygexvgpjdc4jdj85f`: `3` = 17, so P2PKH address
* `r`: tagged field: route information
* `9y`: `data_length` (`9` = 5, `y` = 4. 5 * 32 + 4 = 164)
`q20q82gphp2nflc7jtzrcazrra7wwgzxqc8u7754cdlpfrmccae92qgzqvzq2ps8pqqqqqqqqqqqq9qqqvpeuqafqxu92d8lr6fvg0r5gv0heeeqgcrqlnm6jhphu9y00rrhy4grqszsvpcgpy9qqqqqqqqqqqq7qqzq`: pubkey `029e03a901b85534ff1e92c43c74431f7ce72046060fcf7a95c37e148f78c77255`, `short_channel_id` 0102030405060708, `fee` 20 millisatoshi, `cltv_expiry_delta` 3. pubkey `039e03a901b85534ff1e92c43c74431f7ce72046060fcf7a95c37e148f78c77255`, `short_channel_id` 030405060708090a, `fee` 30 millisatoshi, `cltv_expiry_delta` 4.
* `fnlkwydm8rg30gjku7wmxmk06sevjp53fmvrcfegvwy7d5443jvyhxsel0hulkstws7vqv400q4j3wgpk4crg49682hr4scqvmad43cq`: signature
* `d5m7tf`: Bech32 checksum
> ### On mainnet, with fallback (P2SH) address 3EktnHQD7RiAE6uzMj2ZifT9YgRrkSgzQX
> lnbc20m1pvjluezhp58yjmdan79s6qqdhdzgynm4zwqd5d7xmw5fk98klysy043l2ahrqspp5qqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqypqfppj3a24vwu6r8ejrss3axul8rxldph2q7z9kmrgvr7xlaqm47apw3d48zm203kzcq357a4ls9al2ea73r8jcceyjtya6fu5wzzpe50zrge6ulk4nvjcpxlekvmxl6qcs9j3tz0469gq5g658y