blockchain/claimtrie.go

@@ -3,6 +3,7 @@ package blockchain
 import (
 	"bytes"
 	"fmt"
+	"strings"
 
 	"github.com/pkg/errors"
 
@@ -181,3 +182,68 @@ func (b *BlockChain) GetClaimsForName(height int32, name string) (string, *node.
 	n.SortClaimsByBid()
 	return string(normalizedName), n, nil
 }
+
+func (b *BlockChain) GetProofForName(name, id string, bid, seq int) (chainhash.Hash, int32, *node.Claim, int32, int32, string, []merkletrie.HashSidePair, error) {
+	// results: block hash, height, claim, bid, takeover, name, pairs, err
+
+	b.chainLock.RLock()
+	defer b.chainLock.RUnlock()
+
+	tip := b.bestChain.Tip()
+
+	normalizedName := normalization.NormalizeIfNecessary([]byte(name), tip.height)
+
+	if tip.height < param.ActiveParams.GrandForkHeight {
+		err := errors.Errorf("Unable to generate proofs for claims before height %d",
+			param.ActiveParams.GrandForkHeight)
+		return tip.hash, tip.height, nil, 0, 0, string(normalizedName), nil, err
+	}
+
+	n, err := b.claimTrie.NodeAt(tip.height, normalizedName)
+	if n == nil && err == nil {
+		err = errors.Errorf("Unable to locate a claim with name %s at height %d", normalizedName, tip.height)
+	}
+	if err != nil {
+		return tip.hash, tip.height, nil, 0, 0, string(normalizedName), nil, err
+	}
+
+	// now find the desired claim
+	n.SortClaimsByBid()
+	var claim *node.Claim
+	for i, c := range n.Claims {
+		if c.Status != node.Activated {
+			continue
+		}
+		if bid >= 0 && i == bid {
+			claim = c
+			bid = i
+			break
+		}
+		if seq >= 0 && int(c.Sequence) == seq {
+			claim = c
+			bid = i
+			break
+		}
+		if len(id) > 0 && strings.HasPrefix(c.ClaimID.String(), id) {
+			claim = c
+			bid = i
+			break
+		}
+	}
+	if claim == nil {
+		if bid >= 0 {
+			err = errors.Errorf("Unable to locate a claim named %s with bid %d at height %d", normalizedName, bid, tip.height)
+		}
+		if seq >= 0 {
+			err = errors.Errorf("Unable to locate a claim named %s with sequence %d at height %d", normalizedName, seq, tip.height)
+		}
+		if len(id) > 0 {
+			err = errors.Errorf("Unable to locate a claim named %s with ID %s at height %d", normalizedName, id, tip.height)
+		}
+		return tip.hash, tip.height, nil, 0, 0, string(normalizedName), nil, err
+	}
+
+	pairs := b.claimTrie.MerklePath(normalizedName, n, bid)
+
+	return tip.hash, tip.height, claim, int32(bid), n.TakenOverAt, string(normalizedName), pairs, nil
+}

btcjson/claimcmds.go

@@ -10,6 +10,10 @@ func init() {
 	MustRegisterCmd("getclaimsfornamebybid", (*GetClaimsForNameByBidCmd)(nil), flags)
 	MustRegisterCmd("getclaimsfornamebyseq", (*GetClaimsForNameBySeqCmd)(nil), flags)
 	MustRegisterCmd("normalize", (*GetNormalizedCmd)(nil), flags)
+
+	MustRegisterCmd("getprooffornamebyid", (*GetProofForNameByIDCmd)(nil), flags)
+	MustRegisterCmd("getprooffornamebybid", (*GetProofForNameByBidCmd)(nil), flags)
+	MustRegisterCmd("getprooffornamebyseq", (*GetProofForNameBySeqCmd)(nil), flags)
 }
 
 // optional inputs are required to be pointers, but they support things like `jsonrpcdefault:"false"`
@@ -95,3 +99,36 @@ type GetNormalizedCmd struct {
 type GetNormalizedResult struct {
 	NormalizedName string `json:"normalizedname"`
 }
+
+type GetProofForNameByIDCmd struct {
+	Name           string `json:"name"`
+	PartialClaimID string `json:"partialclaimid"`
+}
+
+type GetProofForNameByBidCmd struct {
+	Name string `json:"name"`
+	Bid  int    `json:"bid"`
+}
+
+type GetProofForNameBySeqCmd struct {
+	Name     string `json:"name"`
+	Sequence int    `json:"sequence"`
+}
+
+type ProofPairResult struct {
+	Right bool   `json:"right"`
+	Hash  string `json:"hash"`
+}
+
+type ProofResult struct { // should we include the claim trie hash?
+	BlockHash      string            `json:"blockhash"`
+	BlockHeight    int32             `json:"blockheight"`
+	NormalizedName string            `json:"normalizedname"`
+	ClaimID        string            `json:"claimid"`
+	TXID           string            `json:"txid"`
+	N              uint32            `json:"n"`
+	Bid            int32             `json:"bid"`
+	Sequence       int32             `json:"sequence"`
+	Takeover       int32             `json:"takeover"`
+	Pairs          []ProofPairResult `json:"pairs"`
+}

claimtrie/claimtrie.go

@@ -303,7 +303,7 @@ func removeDuplicates(names [][]byte) [][]byte { // this might be too expensive;
 	return names
 }
 
-// ResetHeight resets the ClaimTrie to a previous known height..
+// ResetHeight resets the ClaimTrie to a previous known height.
 func (ct *ClaimTrie) ResetHeight(height int32) error {
 
 	names := make([][]byte, 0)
@@ -320,6 +320,9 @@ func (ct *ClaimTrie) ResetHeight(height int32) error {
 	}
 
 	passedHashFork := ct.height >= param.ActiveParams.AllClaimsInMerkleForkHeight && height < param.ActiveParams.AllClaimsInMerkleForkHeight
+	if !passedHashFork {
+		passedHashFork = ct.height >= param.ActiveParams.GrandForkHeight && height < param.ActiveParams.GrandForkHeight
+	}
 	hash, err := ct.blockRepo.Get(height)
 	if err != nil {
 		return err
@@ -486,3 +489,21 @@ func (ct *ClaimTrie) makeNameHashNext(names [][]byte, all bool, interrupt <-chan
 	}()
 	return outputs
 }
+
+func (ct *ClaimTrie) MerklePath(name []byte, n *node.Node, bid int) []merkletrie.HashSidePair {
+	pairs := ct.merkleTrie.MerklePath(name)
+	// TODO: organize this code better
+	// this is the 2nd half of the above merkle tree computation
+	// it's done like this so we don't have to create the Node object multiple times
+	claimHashes := node.ComputeClaimHashes(name, n)
+	partials := node.ComputeMerklePath(claimHashes, bid)
+	for i := len(partials) - 1; i >= 0; i-- {
+		pairs = append(pairs, merkletrie.HashSidePair{Right: ((bid >> i) & 1) > 0, Hash: partials[i]})
+	}
+
+	// reverse the list order:
+	for i, j := 0, len(pairs)-1; i < j; i, j = i+1, j-1 {
+		pairs[i], pairs[j] = pairs[j], pairs[i]
+	}
+	return pairs
+}

claimtrie/claimtrie_test.go

@@ -1025,3 +1025,66 @@ func TestBlock884431(t *testing.T) {
 	r.NoError(err)
 	r.Equal(o11.String(), n.BestClaim.OutPoint.String())
 }
+
+func TestMerklePath(t *testing.T) {
+	r := require.New(t)
+	setup(t)
+	param.ActiveParams.ActiveDelayFactor = 1
+	param.ActiveParams.NormalizedNameForkHeight = 5
+	param.ActiveParams.AllClaimsInMerkleForkHeight = 6
+	param.ActiveParams.GrandForkHeight = 7
+
+	ct, err := New(cfg)
+	r.NoError(err)
+	r.NotNil(ct)
+	defer ct.Close()
+
+	hash := chainhash.HashH([]byte{1, 2, 3})
+	o1 := wire.OutPoint{Hash: hash, Index: 1}
+	o2 := wire.OutPoint{Hash: hash, Index: 2}
+	o3 := wire.OutPoint{Hash: hash, Index: 3}
+
+	err = ct.AddClaim([]byte("test"), o1, change.NewClaimID(o1), 1)
+	r.NoError(err)
+
+	err = ct.AddClaim([]byte("test"), o2, change.NewClaimID(o2), 2)
+	r.NoError(err)
+
+	err = ct.AddClaim([]byte("tester"), o3, change.NewClaimID(o3), 1)
+	r.NoError(err)
+
+	for i := 0; i < 10; i++ {
+		err = ct.AppendBlock()
+		r.NoError(err)
+	}
+
+	n, err := ct.NodeAt(ct.height, []byte("test"))
+	r.NoError(err)
+	pairs := ct.MerklePath([]byte("test"), n, 0)
+	claimHash, err := node.ComputeBidSeqNameHash([]byte("test"), n.Claims[0], 0, n.TakenOverAt)
+	r.NoError(err)
+	validatePairs(r, pairs, ct.MerkleHash(), claimHash)
+
+	pairs = ct.MerklePath([]byte("test"), n, 1)
+	claimHash, err = node.ComputeBidSeqNameHash([]byte("test"), n.Claims[1], 1, n.TakenOverAt)
+	r.NoError(err)
+	validatePairs(r, pairs, ct.MerkleHash(), claimHash)
+
+	n, err = ct.NodeAt(ct.height, []byte("tester"))
+	r.NoError(err)
+	pairs = ct.MerklePath([]byte("tester"), n, 0)
+	claimHash, err = node.ComputeBidSeqNameHash([]byte("tester"), n.Claims[0], 0, n.TakenOverAt)
+	r.NoError(err)
+	validatePairs(r, pairs, ct.MerkleHash(), claimHash)
+}
+
+func validatePairs(r *require.Assertions, pairs []merkletrie.HashSidePair, target *chainhash.Hash, claimHash *chainhash.Hash) {
+	for i := range pairs {
+		if pairs[i].Right {
+			claimHash = node.HashMerkleBranches(pairs[i].Hash, claimHash)
+		} else {
+			claimHash = node.HashMerkleBranches(claimHash, pairs[i].Hash)
+		}
+	}
+	r.True(claimHash.IsEqual(target))
+}

claimtrie/merkletrie/merkletrie.go

@@ -253,3 +253,7 @@ func (t *PersistentTrie) Dump(s string) {
 func (t *PersistentTrie) Flush() error {
 	return t.repo.Flush()
 }
+
+func (t *PersistentTrie) MerklePath(name []byte) []HashSidePair {
+	panic("MerklePath not implemented in PersistentTrie")
+}

claimtrie/merkletrie/ramtrie.go

@@ -16,6 +16,7 @@ type MerkleTrie interface {
 	MerkleHash() *chainhash.Hash
 	MerkleHashAllClaims() *chainhash.Hash
 	Flush() error
+	MerklePath(name []byte) []HashSidePair
 }
 
 type RamTrie struct {
@@ -111,29 +112,80 @@ func (rt *RamTrie) merkleHashAllClaims(v *collapsedVertex) *chainhash.Hash {
 		return v.merkleHash
 	}
 
-	childHashes := make([]*chainhash.Hash, 0, len(v.children))
-	for _, ch := range v.children {
-		h := rt.merkleHashAllClaims(ch)
-		childHashes = append(childHashes, h)
-	}
+	childHash, hasChildren := rt.computeChildHash(v)
 
 	claimHash := NoClaimsHash
 	if v.claimHash != nil {
 		claimHash = v.claimHash
-	} else if len(childHashes) == 0 {
+	} else if !hasChildren {
 		return nil
 	}
 
-	childHash := NoChildrenHash
-	if len(childHashes) > 0 {
-		// this shouldn't be referencing node; where else can we put this merkle root func?
-		childHash = node.ComputeMerkleRoot(childHashes)
-	}
-
 	v.merkleHash = node.HashMerkleBranches(childHash, claimHash)
 	return v.merkleHash
 }
 
+func (rt *RamTrie) computeChildHash(v *collapsedVertex) (*chainhash.Hash, bool) {
+	childHashes := make([]*chainhash.Hash, 0, len(v.children))
+	for _, ch := range v.children {
+		h := rt.merkleHashAllClaims(ch)
+		childHashes = append(childHashes, h)
+	}
+	childHash := NoChildrenHash
+	if len(childHashes) > 0 {
+		// this shouldn't be referencing node; where else can we put this merkle root func?
+		childHash = node.ComputeMerkleRoot(childHashes)
+	}
+	return childHash, len(childHashes) > 0
+}
+
 func (rt *RamTrie) Flush() error {
 	return nil
 }
+
+type HashSidePair struct {
+	Right bool
+	Hash  *chainhash.Hash
+}
+
+func (rt *RamTrie) MerklePath(name []byte) []HashSidePair {
+
+	// algorithm:
+	// for each node in the path to key:
+	//   get all the childHashes for that node and the index of our path
+	//   get all the claimHashes for that node as well
+	//   if we're at the end of the path:
+	//      push(true, root(childHashes))
+	//      push all of merklePath(claimHashes, bid)
+	//   else
+	//      push(false, root(claimHashes)
+	//      push all of merklePath(childHashes, child index)
+
+	var results []HashSidePair
+
+	indexes, path := rt.FindPath(name)
+	for i := 0; i < len(indexes); i++ {
+		if i == len(indexes)-1 {
+			childHash, _ := rt.computeChildHash(path[i])
+			results = append(results, HashSidePair{Right: true, Hash: childHash})
+			// letting the caller append the claim hashes at present (needs better code organization)
+		} else {
+			ch := path[i].claimHash
+			if ch == nil {
+				ch = NoClaimsHash
+			}
+			results = append(results, HashSidePair{Right: false, Hash: ch})
+			childHashes := make([]*chainhash.Hash, 0, len(path[i].children))
+			for j := range path[i].children {
+				childHashes = append(childHashes, path[i].children[j].merkleHash)
+			}
+			if len(childHashes) > 0 {
+				partials := node.ComputeMerklePath(childHashes, indexes[i+1])
+				for i := len(partials) - 1; i >= 0; i-- {
+					results = append(results, HashSidePair{Right: ((indexes[i+1] >> i) & 1) > 0, Hash: partials[i]})
+				}
+			}
+		}
+	}
+	return results
+}

claimtrie/node/hash_manager.go

@@ -1,111 +0,0 @@
-package node
-
-import (
-	"crypto/sha256"
-	"encoding/binary"
-
-	"github.com/btcsuite/btcd/chaincfg/chainhash"
-	"github.com/btcsuite/btcd/claimtrie/change"
-	"github.com/btcsuite/btcd/claimtrie/param"
-)
-
-type HashV2Manager struct {
-	Manager
-}
-
-type HashV3Manager struct {
-	Manager
-}
-
-func (nm *HashV2Manager) claimHashes(name []byte) (*chainhash.Hash, int32) {
-
-	n, err := nm.NodeAt(nm.Height(), name)
-	if err != nil || n == nil {
-		return nil, 0
-	}
-
-	n.SortClaimsByBid()
-	claimHashes := make([]*chainhash.Hash, 0, len(n.Claims))
-	for _, c := range n.Claims {
-		if c.Status == Activated { // TODO: unit test this line
-			claimHashes = append(claimHashes, calculateNodeHash(c.OutPoint, n.TakenOverAt))
-		}
-	}
-	if len(claimHashes) > 0 {
-		return ComputeMerkleRoot(claimHashes), n.NextUpdate(nm.Height())
-	}
-	return nil, n.NextUpdate(nm.Height())
-}
-
-func (nm *HashV2Manager) Hash(name []byte) (*chainhash.Hash, int32) {
-
-	if nm.Height() >= param.ActiveParams.AllClaimsInMerkleForkHeight {
-		return nm.claimHashes(name)
-	}
-
-	return nm.Manager.Hash(name)
-}
-
-func (nm *HashV3Manager) AppendChange(chg change.Change) {
-	if nm.Height() >= param.ActiveParams.GrandForkHeight && len(chg.Name) == 0 {
-		return
-	}
-	nm.Manager.AppendChange(chg)
-}
-
-func calculateBidSeqNameHash(name []byte, c *Claim, bid, takeover int32) (*chainhash.Hash, error) {
-
-	s := sha256.New()
-
-	s.Write(c.OutPoint.Hash[:])
-
-	var temp [4]byte
-	binary.BigEndian.PutUint32(temp[:], c.OutPoint.Index)
-	s.Write(temp[:])
-
-	binary.BigEndian.PutUint32(temp[:], uint32(bid))
-	s.Write(temp[:])
-
-	binary.BigEndian.PutUint32(temp[:], uint32(c.Sequence))
-	s.Write(temp[:])
-
-	binary.BigEndian.PutUint32(temp[:], uint32(takeover))
-	s.Write(temp[:])
-
-	s.Write(name)
-
-	var m [sha256.Size]byte
-	return chainhash.NewHash(s.Sum(m[:0]))
-}
-
-func (nm *HashV3Manager) bidSeqNameHash(name []byte) (*chainhash.Hash, int32) {
-	n, err := nm.NodeAt(nm.Height(), name)
-	if err != nil || n == nil {
-		return nil, 0
-	}
-
-	n.SortClaimsByBid()
-	claimHashes := make([]*chainhash.Hash, 0, len(n.Claims))
-	for i, c := range n.Claims {
-		if c.Status == Activated {
-			h, _ := calculateBidSeqNameHash(name, c, int32(i), n.TakenOverAt)
-			claimHashes = append(claimHashes, h)
-		}
-	}
-	if len(claimHashes) > 0 {
-		return ComputeMerkleRoot(claimHashes), n.NextUpdate(nm.Height())
-	}
-	return nil, n.NextUpdate(nm.Height())
-}
-
-func (nm *HashV3Manager) Hash(name []byte) (*chainhash.Hash, int32) {
-
-	if nm.Height() >= param.ActiveParams.GrandForkHeight {
-		if len(name) == 0 {
-			return nil, 0 // empty name's claims are not included in the hash
-		}
-		return nm.bidSeqNameHash(name)
-	}
-
-	return nm.Manager.Hash(name)
-}

claimtrie/node/hashfork_manager.go

@@ -1,6 +1,9 @@
 package node
 
 import (
+	"crypto/sha256"
+	"encoding/binary"
+
 	"github.com/lbryio/lbcd/chaincfg/chainhash"
 	"github.com/lbryio/lbcd/claimtrie/param"
 )
@@ -9,6 +12,10 @@ type HashV2Manager struct {
 	Manager
 }
 
+type HashV3Manager struct {
+	Manager
+}
+
 func (nm *HashV2Manager) computeClaimHashes(name []byte) (*chainhash.Hash, int32) {
 
 	n, err := nm.NodeAt(nm.Height(), name)
@@ -24,9 +31,9 @@ func (nm *HashV2Manager) computeClaimHashes(name []byte) (*chainhash.Hash, int32
 		}
 	}
 	if len(claimHashes) > 0 {
-		return ComputeMerkleRoot(claimHashes), n.NextUpdate()
+		return ComputeMerkleRoot(claimHashes), n.NextUpdate(nm.Height())
 	}
-	return nil, n.NextUpdate()
+	return nil, n.NextUpdate(nm.Height())
 }
 
 func (nm *HashV2Manager) Hash(name []byte) (*chainhash.Hash, int32) {
@@ -37,3 +44,72 @@ func (nm *HashV2Manager) Hash(name []byte) (*chainhash.Hash, int32) {
 
 	return nm.Manager.Hash(name)
 }
+
+func (nm *HashV3Manager) AppendChange(chg change.Change) {
+	if nm.Height() >= param.ActiveParams.GrandForkHeight && len(chg.Name) == 0 {
+		return
+	}
+	nm.Manager.AppendChange(chg)
+}
+
+func ComputeBidSeqNameHash(name []byte, c *Claim, bid, takeover int32) (*chainhash.Hash, error) {
+
+	s := sha256.New()
+
+	s.Write(c.OutPoint.Hash[:])
+
+	var temp [4]byte
+	binary.BigEndian.PutUint32(temp[:], c.OutPoint.Index)
+	s.Write(temp[:])
+
+	binary.BigEndian.PutUint32(temp[:], uint32(bid))
+	s.Write(temp[:])
+
+	binary.BigEndian.PutUint32(temp[:], uint32(c.Sequence))
+	s.Write(temp[:])
+
+	binary.BigEndian.PutUint32(temp[:], uint32(takeover))
+	s.Write(temp[:])
+
+	s.Write(name)
+
+	var m [sha256.Size]byte
+	return chainhash.NewHash(s.Sum(m[:0]))
+}
+
+func (nm *HashV3Manager) bidSeqNameHash(name []byte) (*chainhash.Hash, int32) {
+	n, err := nm.NodeAt(nm.Height(), name)
+	if err != nil || n == nil {
+		return nil, 0
+	}
+
+	claimHashes := ComputeClaimHashes(name, n)
+	if len(claimHashes) > 0 {
+		return ComputeMerkleRoot(claimHashes), n.NextUpdate(nm.Height())
+	}
+	return nil, n.NextUpdate(nm.Height())
+}
+
+func ComputeClaimHashes(name []byte, n *Node) []*chainhash.Hash {
+	n.SortClaimsByBid()
+	claimHashes := make([]*chainhash.Hash, 0, len(n.Claims))
+	for i, c := range n.Claims {
+		if c.Status == Activated {
+			h, _ := ComputeBidSeqNameHash(name, c, int32(i), n.TakenOverAt)
+			claimHashes = append(claimHashes, h)
+		}
+	}
+	return claimHashes
+}
+
+func (nm *HashV3Manager) Hash(name []byte) (*chainhash.Hash, int32) {
+
+	if nm.Height() >= param.ActiveParams.GrandForkHeight {
+		if len(name) == 0 {
+			return nil, 0 // empty name's claims are not included in the hash
+		}
+		return nm.bidSeqNameHash(name)
+	}
+
+	return nm.Manager.Hash(name)
+}

claimtrie/node/hashfunc.go

@@ -55,3 +55,59 @@ func calculateNodeHash(op wire.OutPoint, takeover int32) *chainhash.Hash {
 
 	return &hh
 }
+
+func ComputeMerklePath(hashes []*chainhash.Hash, idx int) []*chainhash.Hash {
+	count := 0
+	matchlevel := -1
+	matchh := false
+	var h *chainhash.Hash
+	var res []*chainhash.Hash
+	var inner [32]*chainhash.Hash // old code had 32; dunno if it's big enough for all scenarios
+
+	iterateInner := func(level int) int {
+		for ; (count & (1 << level)) == 0; level++ {
+			ihash := inner[level]
+			if matchh {
+				res = append(res, ihash)
+			} else if matchlevel == level {
+				res = append(res, h)
+				matchh = true
+			}
+			h = HashMerkleBranches(ihash, h)
+		}
+		return level
+	}
+
+	for count < len(hashes) {
+		h = hashes[count]
+		matchh = count == idx
+		count++
+		level := iterateInner(0)
+		// Store the resulting hash at inner position level.
+		inner[level] = h
+		if matchh {
+			matchlevel = level
+		}
+	}
+
+	level := 0
+	for (count & (1 << level)) == 0 {
+		level++
+	}
+
+	h = inner[level]
+	matchh = matchlevel == level
+
+	for count != (1 << level) {
+		// If we reach this point, h is an inner value that is not the top.
+		if matchh {
+			res = append(res, h)
+		}
+		h = HashMerkleBranches(h, h)
+		// Increment count to the value it would have if two entries at this
+		count += 1 << level
+		level++
+		level = iterateInner(level)
+	}
+	return res
+}

rpcclaimtrie.go

@@ -22,6 +22,10 @@ var claimtrieHandlers = map[string]commandHandler{
 	"getclaimsfornamebybid": handleGetClaimsForNameByBid,
 	"getclaimsfornamebyseq": handleGetClaimsForNameBySeq,
 	"normalize":             handleGetNormalized,
+
+	"getprooffornamebyid":  handleGetProofForNameByID,
+	"getprooffornamebybid": handleGetProofForNameByBid,
+	"getprooffornamebyseq": handleGetProofForNameBySeq,
 }
 
 func handleGetChangesInBlock(s *rpcServer, cmd interface{}, _ <-chan struct{}) (interface{}, error) {
@@ -350,3 +354,64 @@ func handleGetNormalized(_ *rpcServer, cmd interface{}, _ <-chan struct{}) (inte
 	}
 	return r, nil
 }
+
+func handleGetProofForNameByID(s *rpcServer, cmd interface{}, _ <-chan struct{}) (interface{}, error) {
+
+	c := cmd.(*btcjson.GetProofForNameByIDCmd)
+	return getProof(s, c.Name, c.PartialClaimID, -1, -1)
+}
+
+func handleGetProofForNameByBid(s *rpcServer, cmd interface{}, _ <-chan struct{}) (interface{}, error) {
+
+	c := cmd.(*btcjson.GetProofForNameByBidCmd)
+	return getProof(s, c.Name, "", c.Bid, -1)
+}
+
+func handleGetProofForNameBySeq(s *rpcServer, cmd interface{}, _ <-chan struct{}) (interface{}, error) {
+
+	c := cmd.(*btcjson.GetProofForNameBySeqCmd)
+	return getProof(s, c.Name, "", -1, c.Sequence)
+}
+
+func getProof(s *rpcServer, name, id string, bid, seq int) (interface{}, error) {
+
+	if !s.cfg.Chain.IsCurrent() {
+		return nil, &btcjson.RPCError{
+			Code:    btcjson.ErrRPCClientInInitialDownload,
+			Message: "Unable to query the chain tip during initial download",
+		}
+	}
+
+	if len(name) == 0 {
+		return nil, &btcjson.RPCError{
+			Code:    btcjson.ErrRPCInvalidParameter,
+			Message: "name is required and cannot be empty",
+		}
+	}
+
+	bh, h, c, b, t, n, pairs, err := s.cfg.Chain.GetProofForName(name, id, bid, seq)
+	if err != nil {
+		return nil, &btcjson.RPCError{
+			Code:    btcjson.ErrRPCMisc,
+			Message: "Message: " + err.Error(),
+		}
+	}
+
+	results := make([]btcjson.ProofPairResult, 0, len(pairs))
+	for i := 0; i < len(pairs); i++ {
+		results = append(results, btcjson.ProofPairResult{Right: pairs[i].Right, Hash: pairs[i].Hash.String()})
+	}
+
+	return btcjson.ProofResult{
+		BlockHash:      bh.String(),
+		BlockHeight:    h,
+		NormalizedName: n,
+		ClaimID:        c.ClaimID.String(),
+		TXID:           c.OutPoint.Hash.String(),
+		N:              c.OutPoint.Index,
+		Bid:            b,
+		Sequence:       c.Sequence,
+		Takeover:       t,
+		Pairs:          results,
+	}, nil
+}