Requesting a TSS Signature

The Threshold Signature Scheme (TSS) Signing Process enables users to request a BandChain TSS group to sign various types of messages in a secure and decentralized manner. This ensures that sensitive cryptographic operations, such as signing transactions, verifying data feed results, and price feed data aggregation, are performed without exposing private key material.

Requesting a Signature

To request a TSS signature, a user must submit a signing request on BandChain. The request can include one of the following SignatureOrder types:

• OracleResultSignatureOrder: Requests a signature for a data feed result within the data feed module.
• TextSignatureOrder: Requests a signature for an arbitrary text message.
• FeedsSignatureOrder: Requests a signature for price data within the feeds module.

Each signature order type serves a distinct purpose, ensuring secure and verifiable signing for various applications on BandChain.

// MsgRequestSignature is a request message used for initiating the signing process.
message MsgRequestSignature {
  option (cosmos.msg.v1.signer)      = "sender";
  option (amino.name)                = "bandtss/MsgRequestSignature";
  option (gogoproto.goproto_getters) = false;

  // content is the signature order of this request signature message.
  google.protobuf.Any content = 1 [(cosmos_proto.accepts_interface) = "Content"];
  // memo is the additional note of the message.
  string memo = 2;
  // fee_limit is the maximum tokens that will be paid for this request.
  repeated cosmos.base.v1beta1.Coin fee_limit = 3
      [(gogoproto.nullable) = false, (gogoproto.castrepeated) = "github.com/cosmos/cosmos-sdk/types.Coins"];
  // sender is the requester of the signing process.
  string sender = 4 [(cosmos_proto.scalar) = "cosmos.AddressString"];
}

// OracleResultSignatureOrder defines a request id to request bandtss signature from the oracle result.
message OracleResultSignatureOrder {
  option (gogoproto.goproto_getters) = false;

  // request_id is oracle's unique identifier for this oracle request.
  uint64 request_id = 1 [(gogoproto.customname) = "RequestID", (gogoproto.casttype) = "RequestID"];

  // encoder is the mode of encoding oracle result signature order.
  Encoder encoder = 3;
}

// FeedsSignatureOrder defines a general signature order for feed data.
message FeedsSignatureOrder {
  option (gogoproto.goproto_getters) = false;

  // signal_ids is the list of signal ids that require signatures.
  repeated string signal_ids = 1 [(gogoproto.customname) = "SignalIDs"];

  // encoder is the mode of encoding feeds signature order.
  Encoder encoder = 2;
}

// TextSignatureOrder defines a general text signature order.
message TextSignatureOrder {
  option (cosmos_proto.implements_interface) = "Content";

  // message is the data that needs to be signed.
  bytes message = 1 [(gogoproto.casttype) = "github.com/cometbft/cometbft/libs/bytes.HexBytes"];
}