diff --git a/consensus/validation.go b/consensus/validation.go
index ba42f8df..140280b9 100644
--- a/consensus/validation.go
+++ b/consensus/validation.go
@@ -275,7 +275,7 @@ func validateFileContracts(ms *MidState, txn types.Transaction, ts V1Transaction
 			return fmt.Errorf("file contract revision %v revises contract after its proof window has opened", i)
 		} else if fcr.FileContract.RevisionNumber <= parent.FileContract.RevisionNumber {
 			return fmt.Errorf("file contract revision %v does not have a higher revision number than its parent", i)
-		} else if types.Hash256(fcr.UnlockConditions.UnlockHash()) != parent.FileContract.UnlockHash {
+		} else if fcr.UnlockConditions.UnlockHash() != parent.FileContract.UnlockHash {
 			return fmt.Errorf("file contract revision %v claims incorrect unlock conditions", i)
 		}
 		outputSum := func(outputs []types.SiacoinOutput) (sum types.Currency) {
diff --git a/consensus/validation_test.go b/consensus/validation_test.go
index 7a462896..0b72a8e3 100644
--- a/consensus/validation_test.go
+++ b/consensus/validation_test.go
@@ -248,7 +248,7 @@ func prepareContractFormation(renterPubKey types.PublicKey, hostKey types.Public
 		WindowStart:    endHeight,
 		WindowEnd:      endHeight + windowSize,
 		Payout:         payout,
-		UnlockHash:     types.Hash256(uc.UnlockHash()),
+		UnlockHash:     uc.UnlockHash(),
 		RevisionNumber: 0,
 		ValidProofOutputs: []types.SiacoinOutput{
 			{Value: renterPayout, Address: refundAddr},
@@ -1658,7 +1658,7 @@ func TestWindowRevision(t *testing.T) {
 	fc := types.FileContract{
 		WindowStart: 0,
 		WindowEnd:   3,
-		UnlockHash:  types.Hash256(uc.UnlockHash()),
+		UnlockHash:  uc.UnlockHash(),
 	}
 	genesisBlock.Transactions = []types.Transaction{{
 		FileContracts: []types.FileContract{fc},
diff --git a/rhp/v2/contracts.go b/rhp/v2/contracts.go
index ece92056..23753a80 100644
--- a/rhp/v2/contracts.go
+++ b/rhp/v2/contracts.go
@@ -46,7 +46,7 @@ func PrepareContractFormation(renterPubKey types.PublicKey, hostKey types.Public
 		WindowStart:    uint64(endHeight),
 		WindowEnd:      uint64(endHeight + host.WindowSize),
 		Payout:         payout,
-		UnlockHash:     types.Hash256(uc.UnlockHash()),
+		UnlockHash:     uc.UnlockHash(),
 		RevisionNumber: 0,
 		ValidProofOutputs: []types.SiacoinOutput{
 			// outputs need to account for tax
diff --git a/types/types.go b/types/types.go
index 5fcd4bdc..19e5280f 100644
--- a/types/types.go
+++ b/types/types.go
@@ -257,7 +257,7 @@ type FileContract struct {
 	Payout             Currency        `json:"payout"`
 	ValidProofOutputs  []SiacoinOutput `json:"validProofOutputs"`
 	MissedProofOutputs []SiacoinOutput `json:"missedProofOutputs"`
-	UnlockHash         Hash256         `json:"unlockHash"`
+	UnlockHash         Address         `json:"unlockHash"`
 	RevisionNumber     uint64          `json:"revisionNumber"`
 }
 
@@ -629,9 +629,9 @@ type StateElement struct {
 
 // A ChainIndexElement is a record of a ChainIndex within the state accumulator.
 type ChainIndexElement struct {
-	ID           BlockID `json:"id"`
-	StateElement StateElement
-	ChainIndex   ChainIndex `json:"chainIndex"`
+	ID           BlockID      `json:"id"`
+	StateElement StateElement `json:"stateElement"`
+	ChainIndex   ChainIndex   `json:"chainIndex"`
 }
 
 // A SiacoinElement is a record of a SiacoinOutput within the state accumulator.
@@ -1096,7 +1096,7 @@ func (fcr FileContractRevision) MarshalJSON() ([]byte, error) {
 		// Payout omitted; see FileContractRevision docstring
 		ValidProofOutputs  []SiacoinOutput `json:"validProofOutputs"`
 		MissedProofOutputs []SiacoinOutput `json:"missedProofOutputs"`
-		UnlockHash         Hash256         `json:"unlockHash"`
+		UnlockHash         Address         `json:"unlockHash"`
 		RevisionNumber     uint64          `json:"revisionNumber"`
 	}{
 		fcr.ParentID,