package app import ( "fmt" "github.com/tendermint/tendermint/crypto/secp256k1" "github.com/cosmos/cosmos-sdk/cmd/gaia/app" sdk "github.com/cosmos/cosmos-sdk/types" "github.com/cosmos/cosmos-sdk/x/auth" "github.com/cosmos/cosmos-sdk/x/bank" ) // This will fail half the time with the second output being 173 // This is due to secp256k1 signatures not being constant size. // nolint: vet func ExampleTxSendSize() { cdc := app.MakeCodec() var gas uint64 = 1 priv1 := secp256k1.GenPrivKeySecp256k1([]byte{0}) addr1 := sdk.AccAddress(priv1.PubKey().Address()) priv2 := secp256k1.GenPrivKeySecp256k1([]byte{1}) addr2 := sdk.AccAddress(priv2.PubKey().Address()) coins := sdk.Coins{sdk.NewCoin("denom", sdk.NewInt(10))} msg1 := bank.MsgMultiSend{ Inputs: []bank.Input{bank.NewInput(addr1, coins)}, Outputs: []bank.Output{bank.NewOutput(addr2, coins)}, } fee := auth.NewStdFee(gas, coins) signBytes := auth.StdSignBytes("example-chain-ID", 1, 1, fee, []sdk.Msg{msg1}, "") sig, _ := priv1.Sign(signBytes) sigs := []auth.StdSignature{{nil, sig}} tx := auth.NewStdTx([]sdk.Msg{msg1}, fee, sigs, "") fmt.Println(len(cdc.MustMarshalBinaryBare([]sdk.Msg{msg1}))) fmt.Println(len(cdc.MustMarshalBinaryBare(tx))) // output: 80 // 169 }