feat: add anchor-evm crate for EVM-based anchoring (#742)

* feat: add anchor-evm crate for EVM-based anchoring

Add new crate implementing EVM blockchain anchoring for Ceramic streams.
- Supports self-anchoring directly to EVM chains without Merkle trees
- Implements gas management with dynamic pricing and retry logic
- Uses environment variables for RPC endpoints to avoid hardcoded secrets
- Includes comprehensive tests for Gnosis Chain integration

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix(anchor-evm): address PR review comments and add full integration test

Fixes from PR #742 review:
- Fix tx_hash_to_cid: wrap hash with Keccak256 code + ETH_TX codec (0x93)
  instead of re-hashing with SHA2-256
- Fix AnchorProof parameter order: (chain_id, root, tx_hash, tx_type)
- Add chain ID validation after connecting to provider
- Implement retry logic with exponential backoff
- Add wallet balance logging for gas cost tracking
- Update default confirmations from 1 to 4 (matching JS implementation)

Code cleanup:
- Remove unused GasConfig (alloy handles gas estimation automatically)
- Remove unused get_root_block function and getRootBlock interface
- Consolidate gnosis_test.rs into integration_test.rs

Testing:
- Add test_cid_to_bytes32_matches_js to verify JS compatibility
- Add test_tx_hash_to_cid_matches_js to verify JS compatibility
- Add test_anchor_service_with_evm for full AnchorService flow testing
  (merkle tree building, EVM anchoring, time event creation)

Documentation:
- Update README with comprehensive test documentation
- Document all environment variables for integration tests
- Update contract interface to match actual implementation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix(anchor-evm): handle reverted transactions and missing block number

- Check receipt.status() and return error if transaction reverted
- Use ok_or_else() instead of unwrap() for block_number

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* chore: macOS-13 -> macos-15-intel

* review comment

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: smrz2001

.github/workflows/build-test-sdk.yml

@@ -27,7 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         settings:
-          - host: macos-13
+          - host: macos-15-intel
             target: x86_64-apple-darwin
             build: pnpm build:rust --target x86_64-apple-darwin && pnpm build:js
           - host: ubuntu-latest
@@ -105,7 +105,7 @@ jobs:
           - host: macos-latest
             target: aarch64-apple-darwin
             architecture: arm64
-          - host: macos-13
+          - host: macos-15-intel
             target: x86_64-apple-darwin
             architecture: x64
         node:

.github/workflows/publish-sdk.yml

@@ -25,7 +25,7 @@ jobs:
       fail-fast: false
       matrix:
         settings:
-          - host: macos-13
+          - host: macos-15-intel
             target: x86_64-apple-darwin
             build: pnpm build:rust --target x86_64-apple-darwin && pnpm build:js
           - host: ubuntu-latest

Cargo.lock

@@ -3,6 +3,7 @@ resolver = "2"
 members = [
     "actor",
     "actor-macros",
+    "anchor-evm",
     "anchor-remote",
     "anchor-service",
     "api",
@@ -42,7 +43,7 @@ members = [
 #   e.g. anyhow's backtrace feature.
 
 ahash = "0.8"
-alloy = { version = "0.4", features = ["k256", "provider-http", "rpc-types"] }
+alloy = { version = "0.4", features = ["k256", "provider-http", "rpc-types", "signers", "sol-types", "signer-local", "contract"] }
 anyhow = { version = "1" }
 arrow = { version = "54", features = ["prettyprint"] }
 arrow-array = "54"
@@ -66,6 +67,7 @@ bytes = "1.1"
 bytesize = "1.1"
 ceramic-actor = { path = "./actor" }
 ceramic-actor-macros = { path = "./actor-macros" }
+ceramic-anchor-evm = { path = "./anchor-evm" }
 ceramic-anchor-service = { path = "./anchor-service" }
 ceramic-anchor-remote = { path = "./anchor-remote" }
 ceramic-api = { path = "./api" }

Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+name = "ceramic-anchor-evm"
+description = "EVM blockchain anchoring service for Ceramic"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+license.workspace = true
+repository.workspace = true
+publish = false
+
+[dependencies]
+alloy.workspace = true
+anyhow.workspace = true
+async-trait.workspace = true
+ceramic-anchor-service.workspace = true
+ceramic-core.workspace = true
+ceramic-event.workspace = true
+hex.workspace = true
+multihash-codetable.workspace = true
+tokio.workspace = true
+tracing.workspace = true
+url.workspace = true
+
+[dev-dependencies]
+ceramic-sql.workspace = true
+cid.workspace = true
+expect-test.workspace = true
+test-log.workspace = true
+tracing-subscriber.workspace = true