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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 rval {
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 {
// Must be 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 authenticate {
// Which node this is.
required bitcoin_pubkey node_id = 1;
// Signature of your session key. */
required signature session_sig = 2;
// How many update_commit and update_revocation messages already received
optional uint64 ack = 3 [ default = 0 ];
};
// 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;
// Hash for revoking second commitment transaction.
required sha256_hash next_revocation_hash = 8;
// 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 initial_fee_rate = 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;
}
// 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?
}
message route_step {
// Where to next?
oneof next {
// Actually, this is the last one
bool end = 1;
// Next lightning node.
bitcoin_pubkey bitcoin = 2;
// Other realms go here...
}
// How much to forward (difference is fee)
required uint32 amount = 4;
};
message route {
repeated route_step steps = 1;
};
message routing {
required bytes info = 1;
}
// Start a new commitment tx to add an HTLC me -> you.
message update_add_htlc {
// Unique identifier for this HTLC.
required uint64 id = 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;
// Onion-wrapped routing information.
required routing route = 5;
}
// Complete your HTLC: I have the R value, pay me!
message update_fulfill_htlc {
// Which HTLC
required uint64 id = 1;
// HTLC R value.
required rval r = 2;
}
// FIXME: Failure information.
message fail_reason {
required bytes info = 1;
}
message update_fail_htlc {
// Which HTLC
required uint64 id = 1;
// Reason for failure (for relay to initial node)
required fail_reason reason = 2;
}
// Commit all the staged changes.
message update_commit {
// Signature for your new commitment tx.
required signature sig = 1;
}
// Complete the update.
message update_revocation {
// Hash preimage which revokes old commitment tx.
required sha256_hash revocation_preimage = 1;
// Revocation hash for my next commit transaction
required sha256_hash next_revocation_hash = 2;
}
// Start clearing out the channel HTLCs so we can close it
message close_clearing {
// Output script for mutual close tx.
required bytes scriptPubkey = 1;
}
message close_signature {
// Fee in satoshis.
required uint64 close_fee = 1;
// Signature on the close transaction.
required signature sig = 2;
}
// 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 {
// Start of connection
authenticate auth = 50;
// 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_add_htlc update_add_htlc = 2;
update_fulfill_htlc update_fulfill_htlc = 3;
update_fail_htlc update_fail_htlc = 4;
update_commit update_commit = 5;
update_revocation update_revocation = 6;
// Closing
close_clearing close_clearing = 30;
close_signature close_signature = 31;
// Unexpected issue.
error error = 40;
}
}