Celo testnet support (#1051)

* Initial Celo support Change-Id: Iee98ee29a8b09af9ca76945792b750d96a170702 * Watcher support * Fix high level make file * Remove node binary committed by mistake * Port change from EthWatcher to CeloWatcher * Use docker to build ABIs * Refactor watcher to eliminate massive redunancy * Fix lint-and-tests to handle multiple defs on link * Minor code cleanup * Celo should use ganache in devnet * Prep for mainnet deploy * Code review rework * Remove celo from sdk package.json
2022-04-28 11:20:38 -05:00 · 2022-04-28 11:20:38 -05:00 · d04328b858
parent 19fb468ceb
commit d04328b858
32 changed files with 3133 additions and 68 deletions
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@ -76,7 +76,8 @@ jobs:
        with:
          go-version: '1.17.5'
      - run: make generate && ./lint.sh
-      - run: cd node && go test -v ./...
+      # The go-ethereum and celo-blockchain packages both implement secp256k1 using the exact same header, but that causes duplicate symbols.
+      - run: cd node && go test -v -ldflags '-extldflags "-Wl,--allow-multiple-definition" ' ./...

  # Run rust lints and tests
  rust-lint-and-tests:
--- a/2
+++ b/2
@ -36,6 +36,8 @@ node: $(BIN)/guardiand

 .PHONY: $(BIN)/guardiand
 $(BIN)/guardiand: dirs generate
+	# The go-ethereum and celo-blockchain packages both implement secp256k1 using the exact same header, but that causes duplicate symbols.
 	cd node && go build -ldflags "-X github.com/certusone/wormhole/node/pkg/version.version=${VERSION}" \
+	  -ldflags '-extldflags "-Wl,--allow-multiple-definition" ' \
 	  -mod=readonly -o ../$(BIN)/guardiand \
 	  github.com/certusone/wormhole/node
--- a/devnet/node.yaml
+++ b/devnet/node.yaml
@ -87,6 +87,8 @@ spec:
            - ws://eth-devnet:8545
            - --klaytnRPC
            - ws://eth-devnet:8545
+            - --celoRPC
+            - ws://eth-devnet:8545
            - --terraWS
            - ws://terra-terrad:26657/websocket
            - --terraLCD
--- a/ethereum/.env.celo.mainnet
+++ b/ethereum/.env.celo.mainnet
@ -0,0 +1,15 @@
+# Celo mainnet env
+# Rename to .env to use with truffle migrations
+
+# Wormhole Core Migrations
+INIT_SIGNERS=["0x58CC3AE5C097b213cE3c81979e1B9f9570746AA5"]
+INIT_CHAIN_ID=0xE
+INIT_GOV_CHAIN_ID=0x1
+INIT_GOV_CONTRACT=0x0000000000000000000000000000000000000000000000000000000000000004
+
+# Bridge Migrations
+BRIDGE_INIT_CHAIN_ID=0xE
+BRIDGE_INIT_GOV_CHAIN_ID=0x1
+BRIDGE_INIT_GOV_CONTRACT=0x0000000000000000000000000000000000000000000000000000000000000004
+# WCELO
+BRIDGE_INIT_WETH=0x3Ad443d769A07f287806874F8E5405cE3Ac902b9
--- a/ethereum/.env.celo.testnet
+++ b/ethereum/.env.celo.testnet
@ -0,0 +1,14 @@
+# Celo testnet env
+# Rename to .env to use with truffle migrations
+
+# Wormhole Core Migrations
+INIT_SIGNERS=["0x13947Bd48b18E53fdAeEe77F3473391aC727C638"]
+INIT_CHAIN_ID=0xE
+INIT_GOV_CHAIN_ID=0x1
+INIT_GOV_CONTRACT=0x0000000000000000000000000000000000000000000000000000000000000004
+
+# Bridge Migrations
+BRIDGE_INIT_CHAIN_ID=0xE
+BRIDGE_INIT_GOV_CHAIN_ID=0x1
+BRIDGE_INIT_GOV_CONTRACT=0x0000000000000000000000000000000000000000000000000000000000000004
+BRIDGE_INIT_WETH=0x524d97A67f50F4A062C28c74F60703Aec9028a94
--- a/ethereum/package.json
+++ b/ethereum/package.json
@ -24,7 +24,8 @@
    "flatten": "mkdir -p node_modules/@poanet/solidity-flattener/contracts && cp -r contracts/* node_modules/@poanet/solidity-flattener/contracts/ && poa-solidity-flattener",
    "deploy-bridge-implementation-only": "mkdir -p build/contracts && cp node_modules/@openzeppelin/contracts/build/contracts/* build/contracts/ && truffle migrate --f 6 --to 6",
    "deploy_weth9": "mkdir -p build/contracts && cp node_modules/@openzeppelin/contracts/build/contracts/* build/contracts/ && truffle migrate --f 9",
-    "verify": "patch -u -f node_modules/truffle-plugin-verify/constants.js -i truffle-verify-constants.patch; truffle run verify $npm_config_module@$npm_config_contract_address --network $npm_config_network"
+    "verify": "patch -u -f node_modules/truffle-plugin-verify/constants.js -i truffle-verify-constants.patch; truffle run verify $npm_config_module@$npm_config_contract_address --network $npm_config_network",
+    "abigen": "truffle run abigen"
  },
  "author": "",
  "license": "ISC",
--- a/ethereum/truffle-config.js
+++ b/ethereum/truffle-config.js
@ -200,6 +200,24 @@ module.exports = {
      gas: '8500000',
      gasPrice: null
    },
+    celo: {
+      provider: () => {
+        return new HDWalletProvider(
+          process.env.MNEMONIC,
+          "https://forno.celo.org"
+        )
+      },
+      network_id: 42220,
+    },    
+    celo_alfajores_testnet: {
+      provider: () => {
+        return new HDWalletProvider(
+          process.env.MNEMONIC,
+          "https://alfajores-forno.celo-testnet.org"
+        )
+      },
+      network_id: 44787,
+    },
  },

  compilers: {
--- a/generate-abi-celo.sh
+++ b/generate-abi-celo.sh
@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# Regenerate node/pkg/celo/abi.
+
+set -euo pipefail
+
+(
+  cd third_party/abigen-celo
+  docker build -t localhost/certusone/wormhole-abigen-celo:latest .
+)
+
+function gen() {
+  local name=$1
+  local pkg=$2
+  
+  kubectl exec -c tests eth-devnet-0 -- npx truffle@5.4.1 run abigen $name
+
+  kubectl exec -c tests eth-devnet-0 -- cat abigenBindings/abi/${name}.abi | \
+    docker run --rm -i localhost/certusone/wormhole-abigen-celo:latest /bin/abigen --abi - --pkg ${pkg} > \
+    node/pkg/celo/${pkg}/abi.go
+}
+
+gen Implementation abi
--- a/generate-abi.sh
+++ b/generate-abi.sh
@ -11,7 +11,7 @@ function gen() {
  local name=$1
  local pkg=$2

-  kubectl exec -c tests eth-devnet-0 -- npx truffle run abigen $name
+  kubectl exec -c tests eth-devnet-0 -- npx truffle@5.4.1 run abigen $name

  kubectl exec -c tests eth-devnet-0 -- cat abigenBindings/abi/${name}.abi | \
    docker run --rm -i localhost/certusone/wormhole-abigen:latest /bin/abigen --abi - --pkg ${pkg} > \
--- a/node/Dockerfile
+++ b/node/Dockerfile
@ -16,6 +16,6 @@ RUN --mount=type=cache,target=/root/.cache --mount=type=cache,target=/go \
 ADD . .

 RUN --mount=type=cache,target=/root/.cache --mount=type=cache,target=/go \
-  go build -race -gcflags="all=-N -l" -mod=readonly -o /guardiand github.com/certusone/wormhole/node
+  go build -race -gcflags="all=-N -l" --ldflags '-extldflags "-Wl,--allow-multiple-definition"' -mod=readonly -o /guardiand github.com/certusone/wormhole/node

 ENTRYPOINT /guardiand
--- a/node/cmd/guardiand/adminnodes.go
+++ b/node/cmd/guardiand/adminnodes.go
@ -111,6 +111,7 @@ func runListNodes(cmd *cobra.Command, args []string) {
 		networks = append(networks, network{"Karura", vaa.ChainIDKarura})
 		networks = append(networks, network{"Acala", vaa.ChainIDAcala})
 		networks = append(networks, network{"Klaytn", vaa.ChainIDKlaytn})
+		networks = append(networks, network{"Celo", vaa.ChainIDCelo})
 	}

 	if len(only) > 0 {
--- a/node/cmd/guardiand/node.go
+++ b/node/cmd/guardiand/node.go
@ -96,6 +96,9 @@ var (
 	klaytnRPC      *string
 	klaytnContract *string

+	celoRPC      *string
+	celoContract *string
+
 	terraWS       *string
 	terraLCD      *string
 	terraContract *string
@ -185,6 +188,9 @@ func init() {
 	klaytnRPC = NodeCmd.Flags().String("klaytnRPC", "", "Klaytn RPC URL")
 	klaytnContract = NodeCmd.Flags().String("klaytnContract", "", "Klaytn contract address")

+	celoRPC = NodeCmd.Flags().String("celoRPC", "", "Celo RPC URL")
+	celoContract = NodeCmd.Flags().String("celoContract", "", "Celo contract address")
+
 	terraWS = NodeCmd.Flags().String("terraWS", "", "Path to terrad root for websocket connection")
 	terraLCD = NodeCmd.Flags().String("terraLCD", "", "Path to LCD service root for http calls")
 	terraContract = NodeCmd.Flags().String("terraContract", "", "Wormhole contract address on Terra blockchain")
@ -317,6 +323,7 @@ func runNode(cmd *cobra.Command, args []string) {
 		readiness.RegisterComponent(common.ReadinessKaruraSyncing)
 		readiness.RegisterComponent(common.ReadinessAcalaSyncing)
 		readiness.RegisterComponent(common.ReadinessKlaytnSyncing)
+		readiness.RegisterComponent(common.ReadinessCeloSyncing)
 	}

 	if *statusAddr != "" {
@ -365,6 +372,7 @@ func runNode(cmd *cobra.Command, args []string) {
 		*karuraContract = devnet.GanacheWormholeContractAddress.Hex()
 		*acalaContract = devnet.GanacheWormholeContractAddress.Hex()
 		*klaytnContract = devnet.GanacheWormholeContractAddress.Hex()
+		*celoContract = devnet.GanacheWormholeContractAddress.Hex()
 	}

 	// Verify flags
@ -442,6 +450,12 @@ func runNode(cmd *cobra.Command, args []string) {
 		if *klaytnContract == "" {
 			logger.Fatal("Please specify --klaytnContract")
 		}
+		if *celoRPC == "" {
+			logger.Fatal("Please specify --celoRPC")
+		}
+		if *celoContract == "" {
+			logger.Fatal("Please specify --celoContract")
+		}
 	} else {
 		if *ethRopstenRPC != "" {
 			logger.Fatal("Please do not specify --ethRopstenRPC in non-testnet mode")
@ -467,6 +481,12 @@ func runNode(cmd *cobra.Command, args []string) {
 		if *klaytnContract != "" && !*unsafeDevMode {
 			logger.Fatal("Please do not specify --klaytnContract")
 		}
+		if *celoRPC != "" && !*unsafeDevMode {
+			logger.Fatal("Please do not specify --celoRPC")
+		}
+		if *celoContract != "" && !*unsafeDevMode {
+			logger.Fatal("Please do not specify --celoContract")
+		}
 	}
 	if *nodeName == "" {
 		logger.Fatal("Please specify --nodeName")
@ -556,6 +576,7 @@ func runNode(cmd *cobra.Command, args []string) {
 	karuraContractAddr := eth_common.HexToAddress(*karuraContract)
 	acalaContractAddr := eth_common.HexToAddress(*acalaContract)
 	klaytnContractAddr := eth_common.HexToAddress(*klaytnContract)
+	celoContractAddr := eth_common.HexToAddress(*celoContract)
 	solAddress, err := solana_types.PublicKeyFromBase58(*solanaContract)
 	if err != nil {
 		logger.Fatal("invalid Solana contract address", zap.Error(err))
@ -645,6 +666,7 @@ func runNode(cmd *cobra.Command, args []string) {
 		chainObsvReqC[vaa.ChainIDKarura] = make(chan *gossipv1.ObservationRequest)
 		chainObsvReqC[vaa.ChainIDAcala] = make(chan *gossipv1.ObservationRequest)
 		chainObsvReqC[vaa.ChainIDKlaytn] = make(chan *gossipv1.ObservationRequest)
+		chainObsvReqC[vaa.ChainIDCelo] = make(chan *gossipv1.ObservationRequest)
 		chainObsvReqC[vaa.ChainIDEthereumRopsten] = make(chan *gossipv1.ObservationRequest)
 	}

@ -757,17 +779,17 @@ func runNode(cmd *cobra.Command, args []string) {
 		}

 		if err := supervisor.Run(ctx, "ethwatch",
-			ethereum.NewEthWatcher(*ethRPC, ethContractAddr, "eth", common.ReadinessEthSyncing, vaa.ChainIDEthereum, lockC, setC, 1, chainObsvReqC[vaa.ChainIDEthereum]).Run); err != nil {
+			ethereum.NewEthWatcher(*ethRPC, ethContractAddr, "eth", common.ReadinessEthSyncing, vaa.ChainIDEthereum, lockC, setC, 1, chainObsvReqC[vaa.ChainIDEthereum], *unsafeDevMode).Run); err != nil {
 			return err
 		}

 		if err := supervisor.Run(ctx, "bscwatch",
-			ethereum.NewEthWatcher(*bscRPC, bscContractAddr, "bsc", common.ReadinessBSCSyncing, vaa.ChainIDBSC, lockC, nil, 1, chainObsvReqC[vaa.ChainIDBSC]).Run); err != nil {
+			ethereum.NewEthWatcher(*bscRPC, bscContractAddr, "bsc", common.ReadinessBSCSyncing, vaa.ChainIDBSC, lockC, nil, 1, chainObsvReqC[vaa.ChainIDBSC], *unsafeDevMode).Run); err != nil {
 			return err
 		}

 		if err := supervisor.Run(ctx, "polygonwatch",
-			ethereum.NewEthWatcher(*polygonRPC, polygonContractAddr, "polygon", common.ReadinessPolygonSyncing, vaa.ChainIDPolygon, lockC, nil, 512, chainObsvReqC[vaa.ChainIDPolygon]).Run); err != nil {
+			ethereum.NewEthWatcher(*polygonRPC, polygonContractAddr, "polygon", common.ReadinessPolygonSyncing, vaa.ChainIDPolygon, lockC, nil, 512, chainObsvReqC[vaa.ChainIDPolygon], *unsafeDevMode).Run); err != nil {
 			// Special case: Polygon can fork like PoW Ethereum, and it's not clear what the safe number of blocks is
 			//
 			// Hardcode the minimum number of confirmations to 512 regardless of what the smart contract specifies to protect
@ -776,37 +798,41 @@ func runNode(cmd *cobra.Command, args []string) {
 			return err
 		}
 		if err := supervisor.Run(ctx, "avalanchewatch",
-			ethereum.NewEthWatcher(*avalancheRPC, avalancheContractAddr, "avalanche", common.ReadinessAvalancheSyncing, vaa.ChainIDAvalanche, lockC, nil, 1, chainObsvReqC[vaa.ChainIDAvalanche]).Run); err != nil {
+			ethereum.NewEthWatcher(*avalancheRPC, avalancheContractAddr, "avalanche", common.ReadinessAvalancheSyncing, vaa.ChainIDAvalanche, lockC, nil, 1, chainObsvReqC[vaa.ChainIDAvalanche], *unsafeDevMode).Run); err != nil {
 			return err
 		}
 		if err := supervisor.Run(ctx, "oasiswatch",
-			ethereum.NewEthWatcher(*oasisRPC, oasisContractAddr, "oasis", common.ReadinessOasisSyncing, vaa.ChainIDOasis, lockC, nil, 1, chainObsvReqC[vaa.ChainIDOasis]).Run); err != nil {
+			ethereum.NewEthWatcher(*oasisRPC, oasisContractAddr, "oasis", common.ReadinessOasisSyncing, vaa.ChainIDOasis, lockC, nil, 1, chainObsvReqC[vaa.ChainIDOasis], *unsafeDevMode).Run); err != nil {
 			return err
 		}
 		if err := supervisor.Run(ctx, "aurorawatch",
-			ethereum.NewEthWatcher(*auroraRPC, auroraContractAddr, "aurora", common.ReadinessAuroraSyncing, vaa.ChainIDAurora, lockC, nil, 1, chainObsvReqC[vaa.ChainIDAurora]).Run); err != nil {
+			ethereum.NewEthWatcher(*auroraRPC, auroraContractAddr, "aurora", common.ReadinessAuroraSyncing, vaa.ChainIDAurora, lockC, nil, 1, chainObsvReqC[vaa.ChainIDAurora], *unsafeDevMode).Run); err != nil {
 			return err
 		}
 		if err := supervisor.Run(ctx, "fantomwatch",
-			ethereum.NewEthWatcher(*fantomRPC, fantomContractAddr, "fantom", common.ReadinessFantomSyncing, vaa.ChainIDFantom, lockC, nil, 1, chainObsvReqC[vaa.ChainIDFantom]).Run); err != nil {
+			ethereum.NewEthWatcher(*fantomRPC, fantomContractAddr, "fantom", common.ReadinessFantomSyncing, vaa.ChainIDFantom, lockC, nil, 1, chainObsvReqC[vaa.ChainIDFantom], *unsafeDevMode).Run); err != nil {
 			return err
 		}

 		if *testnetMode {
 			if err := supervisor.Run(ctx, "ethropstenwatch",
-				ethereum.NewEthWatcher(*ethRopstenRPC, ethRopstenContractAddr, "ethropsten", common.ReadinessEthRopstenSyncing, vaa.ChainIDEthereumRopsten, lockC, nil, 1, chainObsvReqC[vaa.ChainIDEthereumRopsten]).Run); err != nil {
+				ethereum.NewEthWatcher(*ethRopstenRPC, ethRopstenContractAddr, "ethropsten", common.ReadinessEthRopstenSyncing, vaa.ChainIDEthereumRopsten, lockC, nil, 1, chainObsvReqC[vaa.ChainIDEthereumRopsten], *unsafeDevMode).Run); err != nil {
 				return err
 			}
 			if err := supervisor.Run(ctx, "karurawatch",
-				ethereum.NewEthWatcher(*karuraRPC, karuraContractAddr, "karura", common.ReadinessKaruraSyncing, vaa.ChainIDKarura, lockC, nil, 1, chainObsvReqC[vaa.ChainIDKarura]).Run); err != nil {
+				ethereum.NewEthWatcher(*karuraRPC, karuraContractAddr, "karura", common.ReadinessKaruraSyncing, vaa.ChainIDKarura, lockC, nil, 1, chainObsvReqC[vaa.ChainIDKarura], *unsafeDevMode).Run); err != nil {
 				return err
 			}
 			if err := supervisor.Run(ctx, "acalawatch",
-				ethereum.NewEthWatcher(*acalaRPC, acalaContractAddr, "acala", common.ReadinessAcalaSyncing, vaa.ChainIDAcala, lockC, nil, 1, chainObsvReqC[vaa.ChainIDAcala]).Run); err != nil {
+				ethereum.NewEthWatcher(*acalaRPC, acalaContractAddr, "acala", common.ReadinessAcalaSyncing, vaa.ChainIDAcala, lockC, nil, 1, chainObsvReqC[vaa.ChainIDAcala], *unsafeDevMode).Run); err != nil {
 				return err
 			}
 			if err := supervisor.Run(ctx, "klaytnwatch",
-				ethereum.NewEthWatcher(*klaytnRPC, klaytnContractAddr, "klaytn", common.ReadinessKlaytnSyncing, vaa.ChainIDKlaytn, lockC, nil, 1, chainObsvReqC[vaa.ChainIDKlaytn]).Run); err != nil {
+				ethereum.NewEthWatcher(*klaytnRPC, klaytnContractAddr, "klaytn", common.ReadinessKlaytnSyncing, vaa.ChainIDKlaytn, lockC, nil, 1, chainObsvReqC[vaa.ChainIDKlaytn], *unsafeDevMode).Run); err != nil {
+				return err
+			}
+			if err := supervisor.Run(ctx, "celowatch",
+				ethereum.NewEthWatcher(*celoRPC, celoContractAddr, "celo", common.ReadinessCeloSyncing, vaa.ChainIDCelo, lockC, nil, 1, chainObsvReqC[vaa.ChainIDCelo], *unsafeDevMode).Run); err != nil {
 				return err
 			}
 		}
--- a/node/go.mod
+++ b/node/go.mod
@ -4,6 +4,7 @@ go 1.17

 require (
 	cloud.google.com/go/bigtable v1.10.1
+	github.com/celo-org/celo-blockchain v1.5.5
 	github.com/cenkalti/backoff/v4 v4.1.1
 	github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e
 	github.com/davecgh/go-spew v1.1.1
@ -62,6 +63,7 @@ require (
 require (
 	cloud.google.com/go v0.97.0 // indirect
 	contrib.go.opencensus.io/exporter/stackdriver v0.13.4 // indirect
+	filippo.io/edwards25519 v1.0.0-alpha.2 // indirect
 	github.com/99designs/keyring v1.1.3 // indirect
 	github.com/ChainSafe/go-schnorrkel v0.0.0-20200405005733-88cbf1b4c40d // indirect
 	github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6 // indirect
@ -71,6 +73,7 @@ require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/bgentry/speakeasy v0.1.0 // indirect
 	github.com/btcsuite/btcd v0.21.0-beta // indirect
+	github.com/celo-org/celo-bls-go v0.2.4 // indirect
 	github.com/cespare/xxhash v1.1.0 // indirect
 	github.com/cespare/xxhash/v2 v2.1.1 // indirect
 	github.com/cheekybits/genny v1.0.0 // indirect
@ -93,7 +96,7 @@ require (
 	github.com/gballet/go-libpcsclite v0.0.0-20190607065134-2772fd86a8ff // indirect
 	github.com/go-kit/kit v0.10.0 // indirect
 	github.com/go-logfmt/logfmt v0.5.0 // indirect
-	github.com/go-ole/go-ole v1.2.1 // indirect
+	github.com/go-ole/go-ole v1.2.5 // indirect
 	github.com/go-stack/stack v1.8.0 // indirect
 	github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect
 	github.com/godbus/dbus v0.0.0-20190726142602-4481cbc300e2 // indirect
@ -115,9 +118,10 @@ require (
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/hashicorp/golang-lru v0.5.5-0.20210104140557-80c98217689d // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/hdevalence/ed25519consensus v0.0.0-20201207055737-7fde80a9d5ff // indirect
 	github.com/holiman/bloomfilter/v2 v2.0.3 // indirect
 	github.com/holiman/uint256 v1.2.0 // indirect
-	github.com/huin/goupnp v1.0.1-0.20210626160114-33cdcbb30dda // indirect
+	github.com/huin/goupnp v1.0.2 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/ipfs/go-cid v0.0.7 // indirect
 	github.com/ipfs/go-datastore v0.4.5 // indirect
@ -200,6 +204,7 @@ require (
 	github.com/nxadm/tail v1.4.8 // indirect
 	github.com/olekukonko/tablewriter v0.0.5 // indirect
 	github.com/onsi/ginkgo v1.16.4 // indirect
+	github.com/onsi/gomega v1.13.0 // indirect
 	github.com/opentracing/opentracing-go v1.2.0 // indirect
 	github.com/pelletier/go-toml v1.6.0 // indirect
 	github.com/peterh/liner v1.1.1-0.20190123174540-a2c9a5303de7 // indirect
--- a/node/go.sum
+++ b/node/go.sum
@ -67,6 +67,8 @@ dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7
 dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU=
 dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4=
 dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
+filippo.io/edwards25519 v1.0.0-alpha.2 h1:EWbZLqGEPSIj2W69gx04KtNVkyPIfe3uj0DhDQJonbQ=
+filippo.io/edwards25519 v1.0.0-alpha.2/go.mod h1:X+pm78QAUPtFLi1z9PYIlS/bdDnvbCOGKtZ+ACWEf7o=
 git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
 github.com/99designs/keyring v1.1.3 h1:mEV3iyZWjkxQ7R8ia8GcG97vCX5zQQ7n4o8R2BylwQY=
 github.com/99designs/keyring v1.1.3/go.mod h1:657DQuMrBZRtuL/voxVyiyb6zpMehlm5vLB9Qwrv904=
@ -187,8 +189,13 @@ github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792/go.mod h1:ghJtE
 github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46fmI40EZs=
 github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7hK1yFx9hf58LP0zeX7UjIGs20ufpu3evjr+s=
 github.com/buger/jsonparser v1.1.1/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0=
+github.com/buraksezer/consistent v0.0.0-20191006190839-693edf70fd72/go.mod h1:OEE5igu/CDjGegM1Jn6ZMo7R6LlV/JChAkjfQQIRLpg=
 github.com/c-bata/go-prompt v0.2.2/go.mod h1:VzqtzE2ksDBcdln8G7mk2RX9QyGjH+OVqOCSiVIqS34=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
+github.com/celo-org/celo-blockchain v1.5.5 h1:jFoVv2SX6d6nbnOylLBMnkUJLk0wXyS6PANn4ZXARIc=
+github.com/celo-org/celo-blockchain v1.5.5/go.mod h1:j18Hg9JZeOg6d5pbFC8Y5ykt1NDs9lmHesyHd91r0PE=
+github.com/celo-org/celo-bls-go v0.2.4 h1:V1y92kM5IRJWQZ6DCwqiKLW7swmUA5y/dPJ9YbU4HfA=
+github.com/celo-org/celo-bls-go v0.2.4/go.mod h1:eXUCLXu5F1yfd3M+3VaUk5ZUXaA0sLK2rWdLC1Cfaqo=
 github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
 github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
 github.com/cenkalti/backoff/v4 v4.1.1 h1:G2HAfAmvm/GcKan2oOQpBXOd2tT2G57ZnZGWa1PxPBQ=
@ -355,8 +362,9 @@ github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-logfmt/logfmt v0.5.0 h1:TrB8swr/68K7m9CcGut2g3UOihhbcbiMAYiuTXdEih4=
 github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
-github.com/go-ole/go-ole v1.2.1 h1:2lOsA72HgjxAuMlKpFiCbHTvu44PIVkZ5hqm3RSdI/E=
 github.com/go-ole/go-ole v1.2.1/go.mod h1:7FAglXiTm7HKlQRDeOQ6ZNUHidzCWXuZWq/1dTyBNF8=
+github.com/go-ole/go-ole v1.2.5 h1:t4MGB5xEDZvXI+0rMjjsfBsD7yAgp/s9ZDkL1JndXwY=
+github.com/go-ole/go-ole v1.2.5/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
 github.com/go-playground/assert/v2 v2.0.1/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
 github.com/go-playground/locales v0.13.0 h1:HyWk6mgj5qFqCT5fjGBuRArbVDfE4hi8+e8ceBS/t7Q=
 github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTMfnGwq/HNwmWNS8=
@ -570,6 +578,8 @@ github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO
 github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ=
 github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2pPBoIllUwCN7I=
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
+github.com/hdevalence/ed25519consensus v0.0.0-20201207055737-7fde80a9d5ff h1:LeVKjw8pcDQj7WVVnbFvbD7ovcv+r/l15ka1NH6Lswc=
+github.com/hdevalence/ed25519consensus v0.0.0-20201207055737-7fde80a9d5ff/go.mod h1:Feit0l8NcNO4g69XNjwvsR0LGcwMMfzI1TF253rOIlQ=
 github.com/holiman/bloomfilter/v2 v2.0.3 h1:73e0e/V0tCydx14a0SCYS/EWCxgwLZ18CZcZKVu0fao=
 github.com/holiman/bloomfilter/v2 v2.0.3/go.mod h1:zpoh+gs7qcpqrHr3dB55AMiJwo0iURXE7ZOP9L9hSkA=
 github.com/holiman/uint256 v1.2.0 h1:gpSYcPLWGv4sG43I2mVLiDZCNDh/EpGjSk8tmtxitHM=
@ -578,8 +588,9 @@ github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpO
 github.com/hudl/fargo v1.3.0/go.mod h1:y3CKSmjA+wD2gak7sUSXTAoopbhU08POFhmITJgmKTg=
 github.com/huin/goupnp v1.0.0/go.mod h1:n9v9KO1tAxYH82qOn+UTIFQDmx5n1Zxd/ClZDMX7Bnc=
 github.com/huin/goupnp v1.0.1-0.20210310174557-0ca763054c88/go.mod h1:nNs7wvRfN1eKaMknBydLNQU6146XQim8t4h+q90biWo=
-github.com/huin/goupnp v1.0.1-0.20210626160114-33cdcbb30dda h1:Vofqyy/Ysqit++X33unU0Gr08b6P35hKm3juytDrBVI=
 github.com/huin/goupnp v1.0.1-0.20210626160114-33cdcbb30dda/go.mod h1:0dxJBVBHqTMjIUMkESDTNgOOx/Mw5wYIfyFmdzSamkM=
+github.com/huin/goupnp v1.0.2 h1:RfGLP+h3mvisuWEyybxNq5Eft3NWhHLPeUN72kpKZoI=
+github.com/huin/goupnp v1.0.2/go.mod h1:0dxJBVBHqTMjIUMkESDTNgOOx/Mw5wYIfyFmdzSamkM=
 github.com/huin/goutil v0.0.0-20170803182201-1ca381bf3150/go.mod h1:PpLOETDnJ0o3iZrZfqZzyLl6l7F3c6L1oWn7OICBi6o=
 github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
@ -985,6 +996,7 @@ github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNx
 github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-isatty v0.0.5-0.20180830101745-3fb116b82035/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-isatty v0.0.5/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOAqxQCu2WE=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
 github.com/mattn/go-isatty v0.0.13 h1:qdl+GuBjcsKKDco5BsxPJlId98mSWNKqYA+Co0SC1yA=
 github.com/mattn/go-isatty v0.0.13/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
@ -1249,6 +1261,7 @@ github.com/segmentio/kafka-go v0.2.0/go.mod h1:X6itGqS9L4jDletMsxZ7Dz+JFWxM6JHfP
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
 github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible h1:Bn1aCHHRnjv4Bl16T8rcaFjYSrGrIZvpiGO6P3Q4GpU=
 github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible/go.mod h1:5b4v6he4MtMOwMlS0TUMTu2PcXUg8+E1lC7eC3UO/RA=
+github.com/shopspring/decimal v1.2.0/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o=
 github.com/shurcooL/component v0.0.0-20170202220835-f88ec8f54cc4/go.mod h1:XhFIlyj5a1fBNx5aJTbKoIq0mNaPvOagO+HjB3EtxrY=
 github.com/shurcooL/events v0.0.0-20181021180414-410e4ca65f48/go.mod h1:5u70Mqkb5O5cxEA8nxTsgrgLehJeAw6Oc4Ab1c/P1HM=
 github.com/shurcooL/github_flavored_markdown v0.0.0-20181002035957-2122de532470/go.mod h1:2dOwnU2uBioM+SGy2aZoq1f/Sd1l9OkAeAUvjSyvgU0=
@ -1661,6 +1674,7 @@ golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190804053845-51ab0e2deafa/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190916202348-b4ddaad3f8a3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
--- a/node/hack/parse_eth_tx/parse_eth_tx.go
+++ b/node/hack/parse_eth_tx/parse_eth_tx.go
@ -1,16 +1,24 @@
+// To compile:
+//   go build --ldflags '-extldflags "-Wl,--allow-multiple-definition"' -o parse_eth_tx
+// Usage:
+//   ./parse_eth_tx -chainID=14 -ethRPC=wss://alfajores-forno.celo-testnet.org/ws -contractAddr=0x88505117CA88e7dd2eC6EA1E13f0948db2D50D56 -tx=0x20a1e7e491dd82b6b33db0820e88a96b58bac28d65770ea73af80e457745aab1
+
 package main

 import (
 	"context"
 	"flag"
+	"log"
+
+	"github.com/certusone/wormhole/node/pkg/celo"
+	"github.com/certusone/wormhole/node/pkg/common"
 	"github.com/certusone/wormhole/node/pkg/ethereum"
 	"github.com/certusone/wormhole/node/pkg/vaa"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/ethclient"
-	"log"
+	ethCommon "github.com/ethereum/go-ethereum/common"
 )

 var (
+	flagChainID      = flag.Int("chainID", 2, "Wormhole chain ID")
 	flagEthRPC       = flag.String("ethRPC", "http://localhost:8545", "Ethereum JSON-RPC endpoint")
 	flagContractAddr = flag.String("contractAddr", "0x98f3c9e6E3fAce36bAAd05FE09d375Ef1464288B", "Ethereum contract address")
 	flagTx           = flag.String("tx", "", "Transaction to parse")
@ -22,17 +30,31 @@ func main() {
 		log.Fatal("No transaction specified")
 	}

+	chainID := vaa.ChainID(*flagChainID)
+
 	ctx := context.Background()

-	c, err := ethclient.DialContext(ctx, *flagEthRPC)
+	var ethIntf common.Ethish
+	if chainID == vaa.ChainIDCelo {
+		ethIntf = &celo.CeloImpl{NetworkName: "celo"}
+	} else {
+		ethIntf = &ethereum.EthImpl{NetworkName: "eth"}
+	}
+
+	err := ethIntf.DialContext(ctx, *flagEthRPC)
 	if err != nil {
 		log.Fatal(err)
 	}

-	contractAddr := common.HexToAddress(*flagContractAddr)
-	transactionHash := common.HexToHash(*flagTx)
+	contractAddr := ethCommon.HexToAddress(*flagContractAddr)
+	transactionHash := ethCommon.HexToHash(*flagTx)

-	block, msgs, err := ethereum.MessageEventsForTransaction(ctx, c, contractAddr, vaa.ChainIDEthereum, transactionHash)
+	err = ethIntf.NewAbiFilterer(contractAddr)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	block, msgs, err := ethereum.MessageEventsForTransaction(ctx, ethIntf, contractAddr, chainID, transactionHash)
 	if err != nil {
 		log.Fatal(err)
 	}
--- a/node/hack/repair_eth/repair_eth.go
+++ b/node/hack/repair_eth/repair_eth.go
@ -35,6 +35,7 @@ var etherscanAPIMap = map[vaa.ChainID]string{
 	vaa.ChainIDOasis:     "https://explorer.emerald.oasis.dev/api",
 	vaa.ChainIDAurora:    "https://explorer.mainnet.aurora.dev/api",
 	vaa.ChainIDFantom:    "https://api.ftmscan.com/api",
+	vaa.ChainIDCelo:      "https://explorer.celo.org//api",
 }

 var coreContractMap = map[vaa.ChainID]string{
@ -45,6 +46,7 @@ var coreContractMap = map[vaa.ChainID]string{
 	vaa.ChainIDOasis:     "0xfe8cd454b4a1ca468b57d79c0cc77ef5b6f64585", // <- converted to all lower case for easy compares
 	vaa.ChainIDAurora:    "0xa321448d90d4e5b0a732867c18ea198e75cac48e",
 	vaa.ChainIDFantom:    strings.ToLower("0x126783A6Cb203a3E35344528B26ca3a0489a1485"),
+	vaa.ChainIDCelo:      strings.ToLower("0x88505117ca88e7dd2eC6ea1e13f0948db2d50d56"), // This needs to be the mainnet wormhole address
 }

 var (
@ -109,7 +111,7 @@ type logResponse struct {
 func getCurrentHeight(chainId vaa.ChainID, ctx context.Context, c *http.Client, api, key string, showErr bool) (uint64, error) {
 	var req *http.Request
 	var err error
-	if chainId == vaa.ChainIDOasis || chainId == vaa.ChainIDAurora {
+	if chainId == vaa.ChainIDOasis || chainId == vaa.ChainIDAurora || chainId == vaa.ChainIDCelo {
 		// This is the BlockScout based explorer leg
 		req, err = http.NewRequest("GET", fmt.Sprintf("%s?module=block&action=eth_block_number", api), nil)
 	} else {
@ -148,7 +150,7 @@ func getCurrentHeight(chainId vaa.ChainID, ctx context.Context, c *http.Client,
 func getLogs(chainId vaa.ChainID, ctx context.Context, c *http.Client, api, key, contract, topic0 string, from, to string, showErr bool) ([]*logEntry, error) {
 	var req *http.Request
 	var err error
-	if chainId == vaa.ChainIDOasis || chainId == vaa.ChainIDAurora {
+	if chainId == vaa.ChainIDOasis || chainId == vaa.ChainIDAurora || chainId == vaa.ChainIDCelo {
 		// This is the BlockScout based explorer leg
 		req, err = http.NewRequestWithContext(ctx, "GET", fmt.Sprintf(
 			"%s?module=logs&action=getLogs&fromBlock=%s&toBlock=%s&topic0=%s",
@ -195,7 +197,7 @@ func getLogs(chainId vaa.ChainID, ctx context.Context, c *http.Client, api, key,
 		return nil, fmt.Errorf("failed to unmarshal log entry: %w", err)
 	}

-	if chainId == vaa.ChainIDOasis || chainId == vaa.ChainIDAurora {
+	if chainId == vaa.ChainIDOasis || chainId == vaa.ChainIDAurora || chainId == vaa.ChainIDCelo {
 		// Because of a bug in BlockScout based explorers we need to check the address
 		// in the log to see if it is the core bridge
 		var filtered []*logEntry
@ -220,7 +222,7 @@ func main() {

 	if *etherscanKey == "" {
 		// BlockScout based explorers don't require an ether scan key
-		if chainID != vaa.ChainIDOasis && chainID != vaa.ChainIDAurora {
+		if chainID != vaa.ChainIDOasis && chainID != vaa.ChainIDAurora && chainID != vaa.ChainIDCelo {
 			log.Fatal("Etherscan API Key is required")
 		}
 	}
--- a/node/pkg/celo/abi/abi.go
+++ b/node/pkg/celo/abi/abi.go
--- a/node/pkg/celo/celoimpl.go
+++ b/node/pkg/celo/celoimpl.go
@ -0,0 +1,264 @@
+// This implements the interface to the "go-ethereum-ish" library used by Celo.
+
+package celo
+
+import (
+	"context"
+
+	celoBind "github.com/celo-org/celo-blockchain/accounts/abi/bind"
+	celoCommon "github.com/celo-org/celo-blockchain/common"
+	celoTypes "github.com/celo-org/celo-blockchain/core/types"
+	celoClient "github.com/celo-org/celo-blockchain/ethclient"
+
+	ethereum "github.com/ethereum/go-ethereum"
+	ethCommon "github.com/ethereum/go-ethereum/common"
+	ethTypes "github.com/ethereum/go-ethereum/core/types"
+	ethEvent "github.com/ethereum/go-ethereum/event"
+
+	celoAbi "github.com/certusone/wormhole/node/pkg/celo/abi"
+	ethAbi "github.com/certusone/wormhole/node/pkg/ethereum/abi"
+
+	"go.uber.org/zap"
+)
+
+type CeloImpl struct {
+	NetworkName string
+	logger      *zap.Logger
+	client      *celoClient.Client
+	filterer    *celoAbi.AbiFilterer
+	caller      *celoAbi.AbiCaller
+}
+
+func (e *CeloImpl) SetLogger(l *zap.Logger) {
+	e.logger = l
+	e.logger.Info("using celo specific ethereum library", zap.String("eth_network", e.NetworkName))
+}
+
+func (e *CeloImpl) DialContext(ctx context.Context, rawurl string) (err error) {
+	e.client, err = celoClient.DialContext(ctx, rawurl)
+	return
+}
+
+func (e *CeloImpl) NewAbiFilterer(address ethCommon.Address) (err error) {
+	e.filterer, err = celoAbi.NewAbiFilterer(celoCommon.BytesToAddress(address.Bytes()), e.client)
+	return
+}
+
+func (e *CeloImpl) NewAbiCaller(address ethCommon.Address) (err error) {
+	e.caller, err = celoAbi.NewAbiCaller(celoCommon.BytesToAddress(address.Bytes()), e.client)
+	return
+}
+
+func (e *CeloImpl) GetCurrentGuardianSetIndex(ctx context.Context) (uint32, error) {
+	if e.caller == nil {
+		panic("caller is not initialized!")
+	}
+
+	opts := &celoBind.CallOpts{Context: ctx}
+	return e.caller.GetCurrentGuardianSetIndex(opts)
+}
+
+func (e *CeloImpl) GetGuardianSet(ctx context.Context, index uint32) (ethAbi.StructsGuardianSet, error) {
+	if e.caller == nil {
+		panic("caller is not initialized!")
+	}
+
+	opts := &celoBind.CallOpts{Context: ctx}
+	celoGs, err := e.caller.GetGuardianSet(opts, index)
+	if err != nil {
+		return ethAbi.StructsGuardianSet{}, err
+	}
+
+	ethKeys := make([]ethCommon.Address, len(celoGs.Keys))
+	for n, k := range celoGs.Keys {
+		ethKeys[n] = ethCommon.BytesToAddress(k.Bytes())
+	}
+
+	return ethAbi.StructsGuardianSet{
+		Keys:           ethKeys,
+		ExpirationTime: celoGs.ExpirationTime,
+	}, err
+}
+
+func (e *CeloImpl) WatchLogMessagePublished(ctx, timeout context.Context, sink chan<- *ethAbi.AbiLogMessagePublished) (ethEvent.Subscription, error) {
+	if e.filterer == nil {
+		panic("filterer is not initialized!")
+	}
+
+	messageC := make(chan *celoAbi.AbiLogMessagePublished, 2)
+	messageSub, err := e.filterer.WatchLogMessagePublished(&celoBind.WatchOpts{Context: timeout}, messageC, nil)
+	if err != nil {
+		return messageSub, err
+	}
+
+	// The purpose of this is to map events from the Celo log message channel to the Eth log message channel.
+	go func() {
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case celoEvent := <-messageC:
+				sink <- convertEventToEth(celoEvent)
+			}
+		}
+	}()
+
+	return messageSub, err
+}
+
+func (e *CeloImpl) TransactionReceipt(ctx context.Context, txHash ethCommon.Hash) (*ethTypes.Receipt, error) {
+	if e.client == nil {
+		panic("client is not initialized!")
+	}
+
+	celoReceipt, err := e.client.TransactionReceipt(ctx, celoCommon.BytesToHash(txHash.Bytes()))
+	if err != nil {
+		return nil, err
+	}
+
+	return convertReceiptToEth(celoReceipt), err
+}
+
+func (e *CeloImpl) TimeOfBlockByHash(ctx context.Context, hash ethCommon.Hash) (uint64, error) {
+	if e.client == nil {
+		panic("client is not initialized!")
+	}
+
+	block, err := e.client.BlockByHash(ctx, celoCommon.BytesToHash(hash.Bytes()))
+	if err != nil {
+		return 0, err
+	}
+
+	return block.Time(), err
+}
+
+func (e *CeloImpl) ParseLogMessagePublished(ethLog ethTypes.Log) (*ethAbi.AbiLogMessagePublished, error) {
+	if e.filterer == nil {
+		panic("filterer is not initialized!")
+	}
+
+	celoEvent, err := e.filterer.ParseLogMessagePublished(*convertLogFromEth(&ethLog))
+	if err != nil {
+		return nil, err
+	}
+
+	return convertEventToEth(celoEvent), err
+}
+
+func (e *CeloImpl) SubscribeNewHead(ctx context.Context, sink chan<- *ethTypes.Header) (ethereum.Subscription, error) {
+	if e.client == nil {
+		panic("client is not initialized!")
+	}
+
+	headSink := make(chan *celoTypes.Header, 2)
+	headerSubscription, err := e.client.SubscribeNewHead(ctx, headSink)
+	if err != nil {
+		return headerSubscription, err
+	}
+
+	// The purpose of this is to map events from the Celo event channel to the Eth event channel.
+	go func() {
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case celoEvent := <-headSink:
+				sink <- convertNewHeadEventToEth(celoEvent)
+			}
+		}
+	}()
+
+	return headerSubscription, err
+}
+
+func convertEventToEth(ev *celoAbi.AbiLogMessagePublished) *ethAbi.AbiLogMessagePublished {
+	return &ethAbi.AbiLogMessagePublished{
+		Sender:           ethCommon.BytesToAddress(ev.Sender.Bytes()),
+		Sequence:         ev.Sequence,
+		Nonce:            ev.Nonce,
+		Payload:          ev.Payload,
+		ConsistencyLevel: ev.ConsistencyLevel,
+		Raw:              *convertLogToEth(&ev.Raw),
+	}
+}
+
+func convertLogToEth(l *celoTypes.Log) *ethTypes.Log {
+	topics := make([]ethCommon.Hash, len(l.Topics))
+	for n, t := range l.Topics {
+		topics[n] = ethCommon.BytesToHash(t.Bytes())
+	}
+
+	return &ethTypes.Log{
+		Address:     ethCommon.BytesToAddress(l.Address.Bytes()),
+		Topics:      topics,
+		Data:        l.Data,
+		BlockNumber: l.BlockNumber,
+		TxHash:      ethCommon.BytesToHash(l.TxHash.Bytes()),
+		TxIndex:     l.TxIndex,
+		BlockHash:   ethCommon.BytesToHash(l.BlockHash.Bytes()),
+		Index:       l.Index,
+		Removed:     l.Removed,
+	}
+}
+
+func convertReceiptToEth(celoReceipt *celoTypes.Receipt) *ethTypes.Receipt {
+	ethLogs := make([]*ethTypes.Log, len(celoReceipt.Logs))
+	for n, l := range celoReceipt.Logs {
+		ethLogs[n] = convertLogToEth(l)
+	}
+
+	return &ethTypes.Receipt{
+		Type:              celoReceipt.Type,
+		PostState:         celoReceipt.PostState,
+		Status:            celoReceipt.Status,
+		CumulativeGasUsed: celoReceipt.CumulativeGasUsed,
+		Bloom:             ethTypes.BytesToBloom(celoReceipt.Bloom.Bytes()),
+		Logs:              ethLogs,
+		TxHash:            ethCommon.BytesToHash(celoReceipt.TxHash.Bytes()),
+		ContractAddress:   ethCommon.BytesToAddress(celoReceipt.ContractAddress.Bytes()),
+		GasUsed:           celoReceipt.GasUsed,
+		BlockHash:         ethCommon.BytesToHash(celoReceipt.BlockHash.Bytes()),
+		BlockNumber:       celoReceipt.BlockNumber,
+		TransactionIndex:  celoReceipt.TransactionIndex,
+	}
+}
+
+func convertLogFromEth(l *ethTypes.Log) *celoTypes.Log {
+	topics := make([]celoCommon.Hash, len(l.Topics))
+	for n, t := range l.Topics {
+		topics[n] = celoCommon.BytesToHash(t.Bytes())
+	}
+
+	return &celoTypes.Log{
+		Address:     celoCommon.BytesToAddress(l.Address.Bytes()),
+		Topics:      topics,
+		Data:        l.Data,
+		BlockNumber: l.BlockNumber,
+		TxHash:      celoCommon.BytesToHash(l.TxHash.Bytes()),
+		TxIndex:     l.TxIndex,
+		BlockHash:   celoCommon.BytesToHash(l.BlockHash.Bytes()),
+		Index:       l.Index,
+		Removed:     l.Removed,
+	}
+}
+
+func convertNewHeadEventToEth(ev *celoTypes.Header) *ethTypes.Header {
+	return &ethTypes.Header{
+		ParentHash: ethCommon.BytesToHash(ev.ParentHash.Bytes()),
+		// Celo doesn't have UncleHash.
+		Coinbase:    ethCommon.BytesToAddress(ev.Coinbase.Bytes()),
+		Root:        ethCommon.BytesToHash(ev.Root.Bytes()),
+		TxHash:      ethCommon.BytesToHash(ev.TxHash.Bytes()),
+		ReceiptHash: ethCommon.BytesToHash(ev.ReceiptHash.Bytes()),
+		Bloom:       ethTypes.BytesToBloom(ev.Bloom.Bytes()),
+		// Celo doesn't have Difficulty.
+		Number: ev.Number,
+		// Celo doesn't have GasLimit.
+		GasUsed: ev.GasUsed,
+		Time:    ev.Time,
+		Extra:   ev.Extra,
+		// Celo doesn't have MixDigest.
+		// Celo doesn't have Nonce.
+		// Celo doesn't have BaseFee.
+	}
+}
--- a/node/pkg/common/ethish.go
+++ b/node/pkg/common/ethish.go
@ -0,0 +1,31 @@
+// This specifies the interface to the chain specific Eth / EVM libraries.
+// This interface should be implemented for each chain that has a unique go-ethereum or "go-ethereum-ish" library.
+
+package common
+
+import (
+	"context"
+
+	ethereum "github.com/ethereum/go-ethereum"
+	ethCommon "github.com/ethereum/go-ethereum/common"
+	ethTypes "github.com/ethereum/go-ethereum/core/types"
+	ethEvent "github.com/ethereum/go-ethereum/event"
+
+	ethAbi "github.com/certusone/wormhole/node/pkg/ethereum/abi"
+
+	"go.uber.org/zap"
+)
+
+type Ethish interface {
+	SetLogger(l *zap.Logger)
+	DialContext(ctx context.Context, rawurl string) error
+	NewAbiFilterer(address ethCommon.Address) error
+	NewAbiCaller(address ethCommon.Address) error
+	GetCurrentGuardianSetIndex(ctx context.Context) (uint32, error)
+	GetGuardianSet(ctx context.Context, index uint32) (ethAbi.StructsGuardianSet, error)
+	WatchLogMessagePublished(ctx, timeout context.Context, sink chan<- *ethAbi.AbiLogMessagePublished) (ethEvent.Subscription, error)
+	TransactionReceipt(ctx context.Context, txHash ethCommon.Hash) (*ethTypes.Receipt, error)
+	TimeOfBlockByHash(ctx context.Context, hash ethCommon.Hash) (uint64, error)
+	ParseLogMessagePublished(log ethTypes.Log) (*ethAbi.AbiLogMessagePublished, error)
+	SubscribeNewHead(ctx context.Context, ch chan<- *ethTypes.Header) (ethereum.Subscription, error)
+}
--- a/node/pkg/common/readiness.go
+++ b/node/pkg/common/readiness.go
@ -17,4 +17,5 @@ const (
 	ReadinessKaruraSyncing     readiness.Component = "karuraSyncing"
 	ReadinessAcalaSyncing      readiness.Component = "acalaSyncing"
 	ReadinessKlaytnSyncing     readiness.Component = "klaytnSyncing"
+	ReadinessCeloSyncing       readiness.Component = "celoSyncing"
 )
--- a/node/pkg/ethereum/by_transaction.go
+++ b/node/pkg/ethereum/by_transaction.go
@ -4,10 +4,8 @@ import (
 	"context"
 	"fmt"
 	"github.com/certusone/wormhole/node/pkg/common"
-	"github.com/certusone/wormhole/node/pkg/ethereum/abi"
 	"github.com/certusone/wormhole/node/pkg/vaa"
 	eth_common "github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/ethclient"
 	"time"
 )

@ -22,18 +20,13 @@ var (
 // Returns the block number and a list of MessagePublication events.
 func MessageEventsForTransaction(
 	ctx context.Context,
-	c *ethclient.Client,
+	ethIntf common.Ethish,
 	contract eth_common.Address,
 	chainId vaa.ChainID,
 	tx eth_common.Hash) (uint64, []*common.MessagePublication, error) {

-	f, err := abi.NewAbiFilterer(contract, c)
-	if err != nil {
-		return 0, nil, fmt.Errorf("failed to create ABI filterer: %w", err)
-	}
-
 	// Get transactions logs from transaction
-	receipt, err := c.TransactionReceipt(ctx, tx)
+	receipt, err := ethIntf.TransactionReceipt(ctx, tx)
 	if err != nil {
 		return 0, nil, fmt.Errorf("failed to get transaction receipt: %w", err)
 	}
@ -51,9 +44,9 @@ func MessageEventsForTransaction(
 	}

 	// Get block
-	block, err := c.BlockByHash(ctx, receipt.BlockHash)
+	blockTime, err := ethIntf.TimeOfBlockByHash(ctx, receipt.BlockHash)
 	if err != nil {
-		return 0, nil, fmt.Errorf("failed to get block: %w", err)
+		return 0, nil, fmt.Errorf("failed to get block time: %w", err)
 	}

 	msgs := make([]*common.MessagePublication, 0, len(receipt.Logs))
@ -73,14 +66,14 @@ func MessageEventsForTransaction(
 			continue
 		}

-		ev, err := f.ParseLogMessagePublished(*l)
+		ev, err := ethIntf.ParseLogMessagePublished(*l)
 		if err != nil {
 			return 0, nil, fmt.Errorf("failed to parse log: %w", err)
 		}

 		message := &common.MessagePublication{
 			TxHash:           ev.Raw.TxHash,
-			Timestamp:        time.Unix(int64(block.Time()), 0),
+			Timestamp:        time.Unix(int64(blockTime), 0),
 			Nonce:            ev.Nonce,
 			Sequence:         ev.Sequence,
 			EmitterChain:     chainId,
--- a/node/pkg/ethereum/ethimpl.go
+++ b/node/pkg/ethereum/ethimpl.go
@ -0,0 +1,105 @@
+// This implements the interface to the standard go-ethereum library.
+
+package ethereum
+
+import (
+	"context"
+
+	ethereum "github.com/ethereum/go-ethereum"
+	ethBind "github.com/ethereum/go-ethereum/accounts/abi/bind"
+	ethCommon "github.com/ethereum/go-ethereum/common"
+	ethTypes "github.com/ethereum/go-ethereum/core/types"
+	ethClient "github.com/ethereum/go-ethereum/ethclient"
+	ethEvent "github.com/ethereum/go-ethereum/event"
+
+	ethAbi "github.com/certusone/wormhole/node/pkg/ethereum/abi"
+
+	"go.uber.org/zap"
+)
+
+type EthImpl struct {
+	NetworkName string
+	client      *ethClient.Client
+	filterer    *ethAbi.AbiFilterer
+	caller      *ethAbi.AbiCaller
+}
+
+func (e *EthImpl) SetLogger(_l *zap.Logger) {}
+
+func (e *EthImpl) DialContext(ctx context.Context, rawurl string) (err error) {
+	e.client, err = ethClient.DialContext(ctx, rawurl)
+	return
+}
+
+func (e *EthImpl) NewAbiFilterer(address ethCommon.Address) (err error) {
+	e.filterer, err = ethAbi.NewAbiFilterer(address, e.client)
+	return
+}
+
+func (e *EthImpl) NewAbiCaller(address ethCommon.Address) (err error) {
+	e.caller, err = ethAbi.NewAbiCaller(address, e.client)
+	return
+}
+
+func (e *EthImpl) GetCurrentGuardianSetIndex(ctx context.Context) (uint32, error) {
+	if e.caller == nil {
+		panic("caller is not initialized!")
+	}
+
+	opts := &ethBind.CallOpts{Context: ctx}
+	return e.caller.GetCurrentGuardianSetIndex(opts)
+}
+
+func (e *EthImpl) GetGuardianSet(ctx context.Context, index uint32) (ethAbi.StructsGuardianSet, error) {
+	if e.caller == nil {
+		panic("caller is not initialized!")
+	}
+
+	opts := &ethBind.CallOpts{Context: ctx}
+	return e.caller.GetGuardianSet(opts, index)
+}
+
+func (e *EthImpl) WatchLogMessagePublished(_ctx, timeout context.Context, sink chan<- *ethAbi.AbiLogMessagePublished) (ethEvent.Subscription, error) {
+	if e.filterer == nil {
+		panic("filterer is not initialized!")
+	}
+
+	return e.filterer.WatchLogMessagePublished(&ethBind.WatchOpts{Context: timeout}, sink, nil)
+}
+
+func (e *EthImpl) TransactionReceipt(ctx context.Context, txHash ethCommon.Hash) (*ethTypes.Receipt, error) {
+	if e.client == nil {
+		panic("client is not initialized!")
+	}
+
+	return e.client.TransactionReceipt(ctx, txHash)
+}
+
+func (e *EthImpl) TimeOfBlockByHash(ctx context.Context, hash ethCommon.Hash) (uint64, error) {
+	if e.client == nil {
+		panic("client is not initialized!")
+	}
+
+	block, err := e.client.BlockByHash(ctx, hash)
+	if err != nil {
+		return 0, err
+	}
+
+	return block.Time(), err
+}
+
+func (e *EthImpl) ParseLogMessagePublished(log ethTypes.Log) (*ethAbi.AbiLogMessagePublished, error) {
+	if e.filterer == nil {
+		panic("filterer is not initialized!")
+	}
+
+	return e.filterer.ParseLogMessagePublished(log)
+}
+
+func (e *EthImpl) SubscribeNewHead(ctx context.Context, sink chan<- *ethTypes.Header) (ethereum.Subscription, error) {
+	if e.client == nil {
+		panic("client is not initialized!")
+	}
+
+	return e.client.SubscribeNewHead(ctx, sink)
+}
--- a/node/pkg/ethereum/watcher.go
+++ b/node/pkg/ethereum/watcher.go
@ -7,19 +7,17 @@ import (
 	gossipv1 "github.com/certusone/wormhole/node/pkg/proto/gossip/v1"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/prometheus/client_golang/prometheus/promauto"
-	"math/big"
 	"sync"
 	"sync/atomic"
 	"time"

 	"github.com/prometheus/client_golang/prometheus"

-	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	eth_common "github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/ethclient"
 	"go.uber.org/zap"

+	"github.com/certusone/wormhole/node/pkg/celo"
 	"github.com/certusone/wormhole/node/pkg/common"
 	"github.com/certusone/wormhole/node/pkg/ethereum/abi"
 	"github.com/certusone/wormhole/node/pkg/readiness"
@ -100,6 +98,9 @@ type (

 		// Minimum number of confirmations to accept, regardless of what the contract specifies.
 		minConfirmations uint64
+
+		// Interface to the chain specific ethereum library.
+		ethIntf common.Ethish
 	}

 	pendingKey struct {
@ -124,7 +125,18 @@ func NewEthWatcher(
 	messageEvents chan *common.MessagePublication,
 	setEvents chan *common.GuardianSet,
 	minConfirmations uint64,
-	obsvReqC chan *gossipv1.ObservationRequest) *Watcher {
+	obsvReqC chan *gossipv1.ObservationRequest,
+	unsafeDevMode bool) *Watcher {
+
+	var ethIntf common.Ethish
+	if chainID == vaa.ChainIDCelo && ! unsafeDevMode {
+		// When we are running in mainnet or testnet, we need to use the Celo ethereum library rather than go-ethereum.
+		// However, in devnet, we currently run the standard ETH node for Celo, so we need to use the standard go-ethereum.
+		ethIntf = &celo.CeloImpl{NetworkName: networkName}
+	} else {
+		ethIntf = &EthImpl{NetworkName: networkName}
+	}
+
 	return &Watcher{
 		url:              url,
 		contract:         contract,
@ -135,11 +147,13 @@ func NewEthWatcher(
 		msgChan:          messageEvents,
 		setChan:          setEvents,
 		obsvReqC:         obsvReqC,
-		pending:          map[pendingKey]*pendingMessage{}}
+		pending:          map[pendingKey]*pendingMessage{},
+		ethIntf:          ethIntf}
 }

 func (e *Watcher) Run(ctx context.Context) error {
 	logger := supervisor.Logger(ctx)
+	e.ethIntf.SetLogger(logger)

 	if err := e.checkForSafeMode(ctx); err != nil {
 		return err
@ -152,19 +166,19 @@ func (e *Watcher) Run(ctx context.Context) error {

 	timeout, cancel := context.WithTimeout(ctx, 15*time.Second)
 	defer cancel()
-	c, err := ethclient.DialContext(timeout, e.url)
+	err := e.ethIntf.DialContext(timeout, e.url)
 	if err != nil {
 		ethConnectionErrors.WithLabelValues(e.networkName, "dial_error").Inc()
 		p2p.DefaultRegistry.AddErrorCount(e.chainID, 1)
 		return fmt.Errorf("dialing eth client failed: %w", err)
 	}

-	f, err := abi.NewAbiFilterer(e.contract, c)
+	err = e.ethIntf.NewAbiFilterer(e.contract)
 	if err != nil {
 		return fmt.Errorf("could not create wormhole contract filter: %w", err)
 	}

-	caller, err := abi.NewAbiCaller(e.contract, c)
+	err = e.ethIntf.NewAbiCaller(e.contract)
 	if err != nil {
 		panic(err)
 	}
@ -175,7 +189,7 @@ func (e *Watcher) Run(ctx context.Context) error {

 	// Subscribe to new message publications
 	messageC := make(chan *abi.AbiLogMessagePublished, 2)
-	messageSub, err := f.WatchLogMessagePublished(&bind.WatchOpts{Context: timeout}, messageC, nil)
+	messageSub, err := e.ethIntf.WatchLogMessagePublished(ctx, timeout, messageC)
 	if err != nil {
 		ethConnectionErrors.WithLabelValues(e.networkName, "subscribe_error").Inc()
 		p2p.DefaultRegistry.AddErrorCount(e.chainID, 1)
@ -183,7 +197,7 @@ func (e *Watcher) Run(ctx context.Context) error {
 	}

 	// Fetch initial guardian set
-	if err := e.fetchAndUpdateGuardianSet(logger, ctx, caller); err != nil {
+	if err := e.fetchAndUpdateGuardianSet(logger, ctx, e.ethIntf); err != nil {
 		return fmt.Errorf("failed to request guardian set: %v", err)
 	}

@ -198,7 +212,7 @@ func (e *Watcher) Run(ctx context.Context) error {
 			case <-ctx.Done():
 				return
 			case <-t.C:
-				if err := e.fetchAndUpdateGuardianSet(logger, ctx, caller); err != nil {
+				if err := e.fetchAndUpdateGuardianSet(logger, ctx, e.ethIntf); err != nil {
 					errC <- fmt.Errorf("failed to request guardian set: %v", err)
 					return
 				}
@ -242,7 +256,7 @@ func (e *Watcher) Run(ctx context.Context) error {
 				}

 				timeout, cancel := context.WithTimeout(ctx, 5*time.Second)
-				blockNumber, msgs, err := MessageEventsForTransaction(timeout, c, e.contract, e.chainID, tx)
+				blockNumber, msgs, err := MessageEventsForTransaction(timeout, e.ethIntf, e.contract, e.chainID, tx)
 				cancel()

 				if err != nil {
@ -307,7 +321,7 @@ func (e *Watcher) Run(ctx context.Context) error {
 				// Request timestamp for block
 				msm := time.Now()
 				timeout, cancel := context.WithTimeout(ctx, 15*time.Second)
-				b, err := c.BlockByNumber(timeout, big.NewInt(int64(ev.Raw.BlockNumber)))
+				blockTime, err := e.ethIntf.TimeOfBlockByHash(timeout, ev.Raw.BlockHash)
 				cancel()
 				queryLatency.WithLabelValues(e.networkName, "block_by_number").Observe(time.Since(msm).Seconds())

@ -320,7 +334,7 @@ func (e *Watcher) Run(ctx context.Context) error {

 				message := &common.MessagePublication{
 					TxHash:           ev.Raw.TxHash,
-					Timestamp:        time.Unix(int64(b.Time()), 0),
+					Timestamp:        time.Unix(int64(blockTime), 0),
 					Nonce:            ev.Nonce,
 					Sequence:         ev.Sequence,
 					EmitterChain:     e.chainID,
@ -356,7 +370,7 @@ func (e *Watcher) Run(ctx context.Context) error {

 	// Watch headers
 	headSink := make(chan *types.Header, 2)
-	headerSubscription, err := c.SubscribeNewHead(ctx, headSink)
+	headerSubscription, err := e.ethIntf.SubscribeNewHead(ctx, headSink)
 	if err != nil {
 		ethConnectionErrors.WithLabelValues(e.networkName, "header_subscribe_error").Inc()
 		p2p.DefaultRegistry.AddErrorCount(e.chainID, 1)
@ -422,7 +436,7 @@ func (e *Watcher) Run(ctx context.Context) error {
 					// Transaction is now ready
 					if pLock.height+uint64(expectedConfirmations) <= blockNumberU {
 						timeout, cancel := context.WithTimeout(ctx, 5*time.Second)
-						tx, err := c.TransactionReceipt(timeout, pLock.message.TxHash)
+						tx, err := e.ethIntf.TransactionReceipt(timeout, pLock.message.TxHash)
 						cancel()

 						// This should never happen - if we got this far, it means that logs were emitted,
@ -532,13 +546,13 @@ func (e *Watcher) Run(ctx context.Context) error {
 func (e *Watcher) fetchAndUpdateGuardianSet(
 	logger *zap.Logger,
 	ctx context.Context,
-	caller *abi.AbiCaller,
+	ethIntf common.Ethish,
 ) error {
 	msm := time.Now()
 	logger.Info("fetching guardian set")
 	timeout, cancel := context.WithTimeout(ctx, 15*time.Second)
 	defer cancel()
-	idx, gs, err := fetchCurrentGuardianSet(timeout, caller)
+	idx, gs, err := fetchCurrentGuardianSet(timeout, ethIntf)
 	if err != nil {
 		ethConnectionErrors.WithLabelValues(e.networkName, "guardian_set_fetch_error").Inc()
 		p2p.DefaultRegistry.AddErrorCount(e.chainID, 1)
@ -568,15 +582,13 @@ func (e *Watcher) fetchAndUpdateGuardianSet(
 }

 // Fetch the current guardian set ID and guardian set from the chain.
-func fetchCurrentGuardianSet(ctx context.Context, caller *abi.AbiCaller) (uint32, *abi.StructsGuardianSet, error) {
-	opts := &bind.CallOpts{Context: ctx}
-
-	currentIndex, err := caller.GetCurrentGuardianSetIndex(opts)
+func fetchCurrentGuardianSet(ctx context.Context, ethIntf common.Ethish) (uint32, *abi.StructsGuardianSet, error) {
+	currentIndex, err := ethIntf.GetCurrentGuardianSetIndex(ctx)
 	if err != nil {
 		return 0, nil, fmt.Errorf("error requesting current guardian set index: %w", err)
 	}

-	gs, err := caller.GetGuardianSet(opts, currentIndex)
+	gs, err := ethIntf.GetGuardianSet(ctx, currentIndex)
 	if err != nil {
 		return 0, nil, fmt.Errorf("error requesting current guardian set value: %w", err)
 	}
--- a/node/pkg/vaa/structs.go
+++ b/node/pkg/vaa/structs.go
@ -112,6 +112,8 @@ func (c ChainID) String() string {
 		return "acala"
 	case ChainIDKlaytn:
 		return "klaytn"
+	case ChainIDCelo:
+		return "celo"
 	default:
 		return fmt.Sprintf("unknown chain ID: %d", c)
 	}
@ -149,6 +151,8 @@ func ChainIDFromString(s string) (ChainID, error) {
 		return ChainIDAcala, nil
 	case "klaytn":
 		return ChainIDKlaytn, nil
+	case "celo":
+		return ChainIDCelo, nil
 	default:
 		return ChainIDUnset, fmt.Errorf("unknown chain ID: %s", s)
 	}
@ -182,6 +186,8 @@ const (
 	ChainIDAcala ChainID = 12
 	// ChainIDKlaytn is the ChainID of Klaytn
 	ChainIDKlaytn ChainID = 13
+	// ChainIDCelo is the ChainID of Celo
+	ChainIDCelo ChainID = 14

 	// ChainIDEthereumRopsten is the ChainID of Ethereum Ropsten
 	ChainIDEthereumRopsten ChainID = 10001
--- a/node/pkg/vaa/structs_test.go
+++ b/node/pkg/vaa/structs_test.go
@ -35,6 +35,7 @@ func TestChainIDFromString(t *testing.T) {
 		{input: "karura", output: ChainIDKarura},
 		{input: "acala", output: ChainIDAcala},
 		{input: "klaytn", output: ChainIDKlaytn},
+		{input: "celo", output: ChainIDCelo},
 		{input: "ethereum-ropsten", output: ChainIDEthereumRopsten},

 		{input: "Solana", output: ChainIDSolana},
@ -50,6 +51,7 @@ func TestChainIDFromString(t *testing.T) {
 		{input: "Karura", output: ChainIDKarura},
 		{input: "Acala", output: ChainIDAcala},
 		{input: "Klaytn", output: ChainIDKlaytn},
+		{input: "Celo", output: ChainIDCelo},
 		{input: "Ethereum-ropsten", output: ChainIDEthereumRopsten},
 	}

@ -131,6 +133,7 @@ func TestChainId_String(t *testing.T) {
 		{input: 11, output: "karura"},
 		{input: 12, output: "acala"},
 		{input: 13, output: "klaytn"},
+		{input: 14, output: "celo"},
 		{input: 10001, output: "ethereum-ropsten"},
 	}

--- a/proto/publicrpc/v1/publicrpc.proto
+++ b/proto/publicrpc/v1/publicrpc.proto
@ -22,6 +22,7 @@ enum ChainID {
  CHAIN_ID_KARURA = 11;
  CHAIN_ID_ACALA = 12;
  CHAIN_ID_KLAYTN = 13;
+  CHAIN_ID_CELO = 14;
  // Special case - Eth has two testnets. CHAIN_ID_ETHEREUM is Goerli,
  // but we also want to connect to Ropsten, so we add a separate chain.
  CHAIN_ID_ETHEREUM_ROPSTEN = 10001;
--- a/sdk/js/src/utils/array.ts
+++ b/sdk/js/src/utils/array.ts
@ -8,6 +8,7 @@ import {
  CHAIN_ID_AURORA,
  CHAIN_ID_AVAX,
  CHAIN_ID_BSC,
+  CHAIN_ID_CELO,
  CHAIN_ID_ETH,
  CHAIN_ID_ETHEREUM_ROPSTEN,
  CHAIN_ID_FANTOM,
@ -31,7 +32,8 @@ export const isEVMChain = (chainId: ChainId) => {
    chainId === CHAIN_ID_FANTOM ||
    chainId === CHAIN_ID_KARURA ||
    chainId === CHAIN_ID_ACALA ||
-    chainId === CHAIN_ID_KLAYTN
+    chainId === CHAIN_ID_KLAYTN ||
+    chainId === CHAIN_ID_CELO
  );
 };

--- a/sdk/js/src/utils/consts.ts
+++ b/sdk/js/src/utils/consts.ts
@ -1,4 +1,4 @@
-export type ChainId = 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 10001;
+export type ChainId = 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 10001;
 export const CHAIN_ID_SOLANA: ChainId = 1;
 export const CHAIN_ID_ETH: ChainId = 2;
 export const CHAIN_ID_TERRA: ChainId = 3;
@ -12,6 +12,7 @@ export const CHAIN_ID_FANTOM: ChainId = 10;
 export const CHAIN_ID_KARURA: ChainId = 11;
 export const CHAIN_ID_ACALA: ChainId = 12;
 export const CHAIN_ID_KLAYTN: ChainId = 13;
+export const CHAIN_ID_CELO: ChainId = 14;
 export const CHAIN_ID_ETHEREUM_ROPSTEN: ChainId = 10001;

 export const WSOL_ADDRESS = "So11111111111111111111111111111111111111112";
--- a/third_party/abigen-celo/Dockerfile
+++ b/third_party/abigen-celo/Dockerfile
@ -0,0 +1,10 @@
+FROM golang:1.17.9-bullseye@sha256:5e415dc60e1277bd0fa3bd9f978ca58c8cf82ec6b6e0a7d67c2d1900e77039e2
+
+RUN apt update && apt install curl git gcc libc-dev
+
+WORKDIR /app
+
+ADD go.mod .
+ADD go.sum .
+
+RUN go build -o /bin/abigen github.com/celo-org/celo-blockchain/cmd/abigen
--- a/third_party/abigen-celo/abigen.go
+++ b/third_party/abigen-celo/abigen.go
@ -0,0 +1,4 @@
+package main
+
+//noinspection ALL
+import _ "github.com/celo-org/celo-blockchain"
--- a/third_party/abigen-celo/go.mod
+++ b/third_party/abigen-celo/go.mod
@ -0,0 +1,5 @@
+module github.com/certusone/wormhole/third_party/abigen-celo
+
+go 1.15
+
+require github.com/celo-org/celo-blockchain v1.5.5
--- a/third_party/abigen-celo/go.sum
+++ b/third_party/abigen-celo/go.sum
@ -0,0 +1,581 @@
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