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syntax = "proto2";
// The outer layer handles encryption, authentication and message
// boundaries.
//
// Helper Types
//
// Protobufs don't have fixed-length fields, so these are a hack.
message sha256_hash {
required fixed64 a = 1;
required fixed64 b = 2;
required fixed64 c = 3;
required fixed64 d = 4;
}
message signature {
required fixed64 r1 = 1;
required fixed64 r2 = 2;
required fixed64 r3 = 3;
required fixed64 r4 = 4;
required fixed64 s1 = 5;
required fixed64 s2 = 6;
required fixed64 s3 = 7;
required fixed64 s4 = 8;
}
message locktime {
oneof locktime {
uint32 seconds = 1;
uint32 blocks = 2;
}
}
// Pubkey for commitment transaction input.
message bitcoin_pubkey {
// Either 65 or 33 bytes.
required bytes key = 1;
}
// How much a node charges (or pays!) for sending.
message funding {
// Base amount (in satoshi).
optional int64 fixed = 1 [ default = 0 ];
// This is charge per millionth of a satoshi.
optional int32 per_micro_satoshi = 2 [ default = 0 ];
}
//
// Packet Types
//
// Set channel params.
message open_channel {
// Relative locktime for outputs going to us.
required locktime delay = 1;
// Hash for revoking first commitment transaction.
required sha256_hash revocation_hash = 2;
// Pubkey for anchor to pay into commitment tx.
required bitcoin_pubkey commit_key = 3;
// How to pay money to us from commit_tx.
required bitcoin_pubkey final_key = 4;
enum anchor_offer {
// I will create the anchor
WILL_CREATE_ANCHOR = 1;
// I won't create the anchor
WONT_CREATE_ANCHOR = 2;
}
required anchor_offer anch = 5;
// How far must anchor be buried before we consider channel live?
optional uint32 min_depth = 6 [ default = 0 ];
// How much fee would I like on commitment tx?
required uint64 commitment_fee = 7;
}
// Whoever is supplying anchor sends this.
message open_anchor {
// Transaction ID of anchor.
required sha256_hash txid = 1;
// Which output is going to the 2 of 2.
required uint32 output_index = 2;
// Amount of anchor output.
required uint64 amount = 3;
// Signature for your initial commitment tx.
required signature commit_sig = 4;
}
// Reply: signature for your initial commitment tx
message open_commit_sig {
required signature sig = 1;
}
// Indicates we've seen anchor reach min-depth.
message open_complete {
// Block it went into.
optional sha256_hash blockid = 1;
// FIXME: add a merkle proof plus block headers here?
}
// Let's spend some money in the channel!
message update {
// Hash for which I will supply preimage to revoke this.
required sha256_hash revocation_hash = 1;
// Change in current payment to-me (implies reverse to-you).
required sint64 delta_msat = 2;
}
// Start a new commitment tx to add an HTLC me -> you.
message update_add_htlc {
// Hash for which I will supply preimage to revoke this commitment tx.
required sha256_hash revocation_hash = 1;
// Amount for htlc (millisatoshi)
required uint32 amount_msat = 2;
// Hash for HTLC R value.
required sha256_hash r_hash = 3;
// Time at which HTLC expires (absolute)
required locktime expiry = 4;
// FIXME: Routing information.
}
// We can't do this HTLC, sorry (instead of update_accept)
message update_decline_htlc {
oneof reason {
funding insufficient_funds = 1;
bool cannot_route = 2;
};
}
// Complete your HTLC: I have the R value, pay me!
message update_fulfill_htlc {
// Hash for which I will supply preimage to revoke this commitment tx.
required sha256_hash revocation_hash = 1;
// HTLC R value.
required sha256_hash r = 2;
}
// Remove my HTLC: it has timed out, before you got the R value.
message update_timedout_htlc {
// Hash for which I will supply preimage to revoke this commitment tx.
required sha256_hash revocation_hash = 1;
// Hash for HTLC R value.
required sha256_hash r_hash = 2;
}
// Remove your HTLC: routing has failed upstream
message update_routefail_htlc {
// Hash for which I will supply preimage to revoke this commitment tx.
required sha256_hash revocation_hash = 1;
// Hash for HTLC R value.
required sha256_hash r_hash = 2;
}
// OK, I accept that update; here's your signature.
message update_accept {
// Signature for your new commitment tx.
required signature sig = 1;
// Hash for which I will supply preimage to revoke this new commit tx.
required sha256_hash revocation_hash = 2;
}
// Thanks for accepting, here's my last bit.
message update_signature {
// Signature for your new commitment tx.
required signature sig = 1;
// Hash preimage which revokes old commitment tx.
required sha256_hash revocation_preimage = 2;
}
// Complete the update.
message update_complete {
// Hash preimage which revokes old commitment tx.
required sha256_hash revocation_preimage = 1;
}
// Begin cooperative close of channel.
message close_channel {
// This is our signature a new transaction which spends the anchor
// output to my open->final and your open->final,
// as per the last commit tx.
required signature sig = 1;
// Fee to pay for close transaction.
required uint64 close_fee = 2;
}
// OK, here's my sig so you can broadcast it too. We're done.
message close_channel_complete {
// This is my signature for that same tx.
required signature sig = 1;
}
// Received close_channel_complete, you can close now.
message close_channel_ack {
}
// This means we're going to hang up; it's to help diagnose only!
message error {
optional string problem = 1;
}
// This is the union which defines all of them
message pkt {
oneof pkt {
// Opening
open_channel open = 20;
open_anchor open_anchor = 21;
open_commit_sig open_commit_sig = 22;
open_complete open_complete = 23;
// Updating (most common)
update update = 1;
update_add_htlc update_add_htlc = 2;
update_accept update_accept = 3;
update_signature update_signature = 4;
update_complete update_complete = 5;
update_decline_htlc update_decline_htlc = 6;
update_fulfill_htlc update_fulfill_htlc = 7;
update_timedout_htlc update_timedout_htlc = 8;
update_routefail_htlc update_routefail_htlc = 9;
// Closing
close_channel close = 30;
close_channel_complete close_complete = 31;
close_channel_ack close_ack = 32;
// Unexpected issue.
error error = 40;
}
}