keys: own ProofOfPossession, drop the luxfi/vm dependency

The four callers reached github.com/luxfi/vm/platformvm/signer for a BLS key
plus a signature over it. That module no longer publishes the path, and keys
sits below the node: it manages keys, so it should not need a VM to make one.
crypto/bls, already a dependency, has everything the type needs.

Co-authored-by: Hanzo Dev <[email protected]>

go.mod

@@ -9,7 +9,6 @@ require (
 	github.com/luxfi/go-bip32 v1.1.0
 	github.com/luxfi/go-bip39 v1.2.0
 	github.com/luxfi/ids v1.3.2
-	github.com/luxfi/protocol v0.0.2
 	github.com/luxfi/tls v1.1.1
 	golang.org/x/crypto v0.52.0
 )
@@ -25,7 +24,6 @@ require (
 	github.com/luxfi/accel v1.2.4 // indirect
 	github.com/luxfi/cache v1.3.1 // indirect
 	github.com/luxfi/container v0.2.1 // indirect
-	github.com/luxfi/formatting v1.1.1 // indirect
 	github.com/luxfi/geth v1.20.1 // indirect
 	github.com/luxfi/math v1.5.1 // indirect
 	github.com/luxfi/math/big v0.1.0 // indirect
@@ -33,15 +31,17 @@ require (
 	github.com/luxfi/metric v1.8.1 // indirect
 	github.com/luxfi/mock v0.1.1 // indirect
 	github.com/luxfi/sampler v1.1.0 // indirect
-	github.com/luxfi/vm v1.3.1 // indirect
 	github.com/luxfi/zap v1.2.6 // indirect
 	github.com/miekg/dns v1.1.72 // indirect
 	github.com/mr-tron/base58 v1.3.0 // indirect
 	github.com/supranational/blst v0.3.16 // indirect
 	go.uber.org/mock v0.6.0 // indirect
 	golang.org/x/exp v0.0.0-20260529124908-c761662dc8c9 // indirect
+	golang.org/x/mod v0.36.0 // indirect
 	golang.org/x/net v0.55.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
 	golang.org/x/sys v0.45.0 // indirect
+	golang.org/x/tools v0.45.0 // indirect
 	gonum.org/v1/gonum v0.17.0 // indirect
 	google.golang.org/protobuf v1.36.11 // indirect
 )

go.sum

@@ -22,8 +22,10 @@ github.com/btcsuite/snappy-go v0.0.0-20151229074030-0bdef8d06723/go.mod h1:8woku
 github.com/btcsuite/snappy-go v1.0.0/go.mod h1:8woku9dyThutzjeg+3xrA5iCpBRH8XEEg3lh6TiUghc=
 github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792/go.mod h1:ghJtEyQwv5/p4Mg4C0fgbePVuGr935/5ddU9Z3TmDRY=
 github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46fmI40EZs=
-github.com/cloudflare/circl v1.6.2 h1:hL7VBpHHKzrV5WTfHCaBsgx/HGbBYlgrwvNXEVDYYsQ=
+github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
-github.com/cloudflare/circl v1.6.2/go.mod h1:2eXP6Qfat4O/Yhh8BznvKnJ+uzEoTQ6jVKJRn81BiS4=
+github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
+github.com/cloudflare/circl v1.6.3 h1:9GPOhQGF9MCYUeXyMYlqTR6a5gTrgR/fBLXvUgtVcg8=
+github.com/cloudflare/circl v1.6.3/go.mod h1:2eXP6Qfat4O/Yhh8BznvKnJ+uzEoTQ6jVKJRn81BiS4=
 github.com/davecgh/go-spew v0.0.0-20171005155431-ecdeabc65495/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -33,8 +35,8 @@ github.com/decred/dcrd/crypto/blake256 v1.0.0/go.mod h1:sQl2p6Y26YV+ZOcSTP6thNdn
 github.com/decred/dcrd/crypto/blake256 v1.1.0 h1:zPMNGQCm0g4QTY27fOCorQW7EryeQ/U0x++OzVrdms8=
 github.com/decred/dcrd/crypto/blake256 v1.1.0/go.mod h1:2OfgNZ5wDpcsFmHmCK5gZTPcCXqlm2ArzUIkw9czNJo=
 github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1/go.mod h1:hyedUtir6IdtD/7lIxGeCxkaw7y45JueMRL4DIyJDKs=
-github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 h1:NMZiJj8QnKe1LgsbDayM4UoHwbvwDRwnI3hwNaAHRnc=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.1 h1:5RVFMOWjMyRy8cARdy79nAmgYw3hK/4HUq48LQ6Wwqo=
-github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0/go.mod h1:ZXNYxsqcloTdSy/rNShjYzMhyjf0LaoftYK0p+A3h40=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.1/go.mod h1:ZXNYxsqcloTdSy/rNShjYzMhyjf0LaoftYK0p+A3h40=
 github.com/decred/dcrd/lru v1.0.0/go.mod h1:mxKOwFd7lFjN2GZYsiz/ecgqR6kkYAl+0pz0tEMk218=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
@@ -49,48 +51,63 @@ github.com/golang/snappy v0.0.4/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEW
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
+github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
+github.com/gorilla/rpc v1.2.1 h1:yC+LMV5esttgpVvNORL/xX4jvTTEUE30UZhZ5JF7K9k=
+github.com/gorilla/rpc v1.2.1/go.mod h1:uNpOihAlF5xRFLuTYhfR0yfCTm0WTQSQttkMSptRfGk=
 github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/grandcat/zeroconf v1.0.0 h1:uHhahLBKqwWBV6WZUDAT71044vwOTL+McW0mBJvo6kE=
+github.com/grandcat/zeroconf v1.0.0/go.mod h1:lTKmG1zh86XyCoUeIHSA4FJMBwCJiQmGfcP2PdzytEs=
+github.com/holiman/uint256 v1.3.2 h1:a9EgMPSC1AAaj1SZL5zIQD3WbwTuHrMGOerLjGmM/TA=
+github.com/holiman/uint256 v1.3.2/go.mod h1:EOMSn4q6Nyt9P6efbI3bueV4e1b3dGlUCXeiRV4ng7E=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/jessevdk/go-flags v0.0.0-20141203071132-1679536dcc89/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jrick/logrotate v1.0.0/go.mod h1:LNinyqDIJnpAur+b8yyulnQw/wDuN1+BYKlTRt3OuAQ=
 github.com/kkdai/bstream v0.0.0-20161212061736-f391b8402d23/go.mod h1:J+Gs4SYgM6CZQHDETBtE9HaSEkGmuNXF86RwHhHUvq4=
-github.com/luxfi/address v1.0.1 h1:Sc4keyuVzBIvHr7uVeYZf2/WY9YDGUgDi/iiWenj49g=
+github.com/luxfi/accel v1.2.4 h1:5VbIHyEvvfobn2zBiTFODxDw1CeqxCepZOLlvkuf9yQ=
-github.com/luxfi/address v1.0.1/go.mod h1:5j3Eh66v9zvv1GbNdZwt+23krV8JlSDaRzmWZU8ZRM0=
+github.com/luxfi/accel v1.2.4/go.mod h1:ISIwAX+ZfsL/S5nsP2JvfldXN6Nc+QzoWf6Jtaq+xsQ=
-github.com/luxfi/cache v1.1.0 h1:6LUyGGZ+rrMAJBbAU6+UwkcamXj3zsboRUodIof2Ong=
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-github.com/luxfi/cache v1.1.0/go.mod h1:9GvlEEE9rFPaaWxvVpSPwW8ZMo2+8VMNNcuPa4AwzPg=
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-github.com/luxfi/consensus v1.22.51 h1:ul7YqQEjsdTCOPxH50Dk3C82DDVNIM4tyQNKYyeFy6M=
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-github.com/luxfi/const v1.4.1/go.mod h1:qWfecjdImPY3kXsy3UAe4ZVpMcsp2/iUlHwUMPVREoI=
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-github.com/luxfi/constants v1.4.2 h1:hxp2cITYxNCKG3xOdjnEesOoCR4GI9Lb5RQ4120ke6E=
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-github.com/luxfi/crypto v1.17.38 h1:PZ52opsm3ECvyKsR2pLSsKONCey+FqpN0ZEwu+KMdO4=
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-github.com/luxfi/crypto v1.17.38/go.mod h1:G2t1GQvPsrwnzwyVEj0LQDuX2AWZVI5kEAPyVeicc5o=
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+github.com/mr-tron/base58 v1.3.0/go.mod h1:2BuubE67DCSWwVfx37JWNG8emOC0sHEU4/HpcYgCLX8=
 github.com/nxadm/tail v1.4.4/go.mod h1:kenIhsEOeOJmVchQTgglprH7qJGnHDVpk1VPCcaMI8A=
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
@@ -100,9 +117,13 @@ github.com/onsi/gomega v1.4.1/go.mod h1:C1qb7wdrVGGVU+Z6iS04AVkA3Q65CEZX59MT0QO5
 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7JYyY=
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/quic-go/quic-go v0.59.1 h1:0Gmua0HW1Tv7ANR7hUYwRyD0MG5OJfgvYSZasGZzBic=
+github.com/quic-go/quic-go v0.59.1/go.mod h1:upnsH4Ju1YkqpLXC305eW3yDZ4NfnNbmQRCMWS58IKU=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
@@ -119,42 +140,61 @@ go.uber.org/mock v0.6.0 h1:hyF9dfmbgIX5EfOdasqLsWD6xqpNZlXblLB/Dbnwv3Y=
 go.uber.org/mock v0.6.0/go.mod h1:KiVJ4BqZJaMj4svdfmHM0AUx4NJYO8ZNpPnZn1Z+BBU=
 golang.org/x/crypto v0.0.0-20170930174604-9419663f5a44/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.46.0 h1:cKRW/pmt1pKAfetfu+RCEvjvZkA9RimPbh7bhFjGVBU=
+golang.org/x/crypto v0.52.0 h1:RMs7fP2rXdep0CftQlK8Uf+kibLm7qkCcradZWYz988=
-golang.org/x/crypto v0.46.0/go.mod h1:Evb/oLKmMraqjZ2iQTwDwvCtJkczlDuTmdJXoZVzqU0=
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-golang.org/x/exp v0.0.0-20251219203646-944ab1f22d93 h1:fQsdNF2N+/YewlRZiricy4P1iimyPKZ/xwniHj8Q2a0=
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keys.go

@@ -25,7 +25,6 @@ import (
 	"github.com/luxfi/go-bip39"
 	"github.com/luxfi/ids"
 	luxtls "github.com/luxfi/tls"
-	"github.com/luxfi/vm/platformvm/signer"
 	"golang.org/x/crypto/sha3"
 )
 
@@ -101,7 +100,7 @@ func GenerateValidatorKey() (*ValidatorKey, error) {
 	}
 	vk.BLSSecretKey = blsKey.ToBytes()
 
-	pop, err := signer.NewProofOfPossession(blsKey)
+	pop, err := NewProofOfPossession(blsKey)
 	if err != nil {
 		return nil, fmt.Errorf("failed to generate BLS PoP: %w", err)
 	}
@@ -276,7 +275,7 @@ func LoadFromDir(nodeDir string) (*ValidatorKey, error) {
 		// This must match how keys are generated in GenerateValidatorKey/DeriveValidatorFromMnemonic
 		blsSigner, err := localsigner.FromBytes(signerBytes)
 		if err == nil {
-			pop, err := signer.NewProofOfPossession(blsSigner)
+			pop, err := NewProofOfPossession(blsSigner)
 			if err == nil {
 				vk.BLSPublicKey = pop.PublicKey[:]
 				vk.BLSPoP = pop.ProofOfPossession[:]
@@ -487,7 +486,7 @@ func DeriveValidatorFromMnemonic(mnemonic string, accountIndex uint32) (*Validat
 	}
 	vk.BLSSecretKey = blsKey.ToBytes()
 
-	pop, err := signer.NewProofOfPossession(blsKey)
+	pop, err := NewProofOfPossession(blsKey)
 	if err != nil {
 		return nil, fmt.Errorf("failed to generate BLS PoP: %w", err)
 	}

pop.go

@@ -0,0 +1,56 @@
+// Copyright (C) 2019-2026, Lux Industries, Inc. All rights reserved.
+// See the file LICENSE for licensing terms.
+
+package keys
+
+import (
+	"errors"
+
+	"github.com/luxfi/crypto/bls"
+)
+
+var errInvalidProofOfPossession = errors.New("invalid proof of possession")
+
+// ProofOfPossession is a BLS public key together with a signature over that key,
+// proving the holder has the matching secret. It is the shape a validator
+// registration carries.
+//
+// Built here rather than imported: the only other copy lives in
+// github.com/luxfi/node, and this module sits below the node in the stack — it
+// manages keys, so it should not need a VM to make one. Everything below comes
+// from crypto/bls, which this module already depends on.
+type ProofOfPossession struct {
+	PublicKey         [bls.PublicKeyLen]byte `serialize:"true" json:"publicKey"`
+	ProofOfPossession [bls.SignatureLen]byte `serialize:"true" json:"proofOfPossession"`
+}
+
+// NewProofOfPossession signs the signer's own compressed public key with it. The
+// signed message being the key itself is what makes the signature a proof of
+// possession rather than an ordinary signature.
+func NewProofOfPossession(sk bls.Signer) (*ProofOfPossession, error) {
+	pkBytes := bls.PublicKeyToCompressedBytes(sk.PublicKey())
+	sig, err := sk.SignProofOfPossession(pkBytes)
+	if err != nil {
+		return nil, err
+	}
+	pop := &ProofOfPossession{}
+	copy(pop.PublicKey[:], pkBytes)
+	copy(pop.ProofOfPossession[:], bls.SignatureToBytes(sig))
+	return pop, nil
+}
+
+// Verify checks the proof against the key it carries.
+func (p *ProofOfPossession) Verify() error {
+	pk, err := bls.PublicKeyFromCompressedBytes(p.PublicKey[:])
+	if err != nil {
+		return err
+	}
+	sig, err := bls.SignatureFromBytes(p.ProofOfPossession[:])
+	if err != nil {
+		return err
+	}
+	if !bls.VerifyProofOfPossession(pk, sig, p.PublicKey[:]) {
+		return errInvalidProofOfPossession
+	}
+	return nil
+}

upgrade_keys.go

@@ -17,7 +17,6 @@ import (
 	luxcrypto "github.com/luxfi/crypto/secp256k1"
 	"github.com/luxfi/ids"
 	luxtls "github.com/luxfi/tls"
-	"github.com/luxfi/vm/platformvm/signer"
 )
 
 func main() {
@@ -110,7 +109,7 @@ func upgradeNode(nodeDir string) error {
 		}
 
 		// Also write public key info
-		pop, err := signer.NewProofOfPossession(blsKey)
+		pop, err := NewProofOfPossession(blsKey)
 		if err != nil {
 			return fmt.Errorf("failed to generate PoP: %w", err)
 		}