Before: code missing
- Expected code
bc_example- Direct attribution
- 0/1 (0%)
- Token evidence
- Initialized B20 Asset · modeled factory query
- Execution
- Successful synthetic receipt
- Application readiness
- Not tested
B20 Discovery & Attribution
A B20 transfer can succeed without your Builder Code. Compare the same transfer before and after an attribution fix, then inspect the evidence.
Same transfer. One missing code.
Synthetic exampleThe token, recipient, raw amount, and modeled execution stay the same. The corrected request uses withAttributionSuffix from Bao Toolkit’s viem adapter.
Before: 0/1Before report
After: 1/1After report
After: code found
- Expected code
bc_example- Direct attribution
- 1/1 (100%)
- Token evidence
- Initialized B20 Asset · modeled factory query
- Execution
- Successful synthetic receipt
- Application readiness
- Not tested
These receipts demonstrate the analyzer. This before/after transfer has not been tested on a native B20 runtime.
Reports you can reproduce
5 synthetic examples · 2 recorded network reports. Synthetic examples remain separate from the attribution Observatory’s totals.
Transfer with missing attribution
A successful transfer omits the expected Builder Code.
SyntheticDirect attribution: 0/1 (0%)
The same transfer with attribution
The existing Bao Toolkit viem helper preserves the expected code.
SyntheticDirect attribution: 1/1 (100%)
Creation followed by a transfer
Canonical factory evidence and a direct transfer in the supplied set.
SyntheticDirect attribution: 1/1 (100%)
Reverted call with unresolved initialization
End-of-block token state cannot establish initialization before a reverted call.
SyntheticDirect attribution: Not measured
Token event inside a router
Receipt evidence does not establish attribution for the nested application.
SyntheticDirect attribution: Not measured
Base mainnet: creation and a direct approval
Six public transactions, including a receipt-matched approval. Expected Builder Code is not configured.
Recorded snapshotDirect attribution: Not measured
Base Sepolia: Asset and Stablecoin creation
Two factory events inside wrapper calls. Nested application attribution remains unresolved.
Recorded snapshotDirect attribution: Not measured
Run the comparison locally
Download a report’s capture, then run the candidate CLI. Offline validation checks internal consistency; a network recheck requires an explicit RPC endpoint.
bao b20 replay --input b20-direct-broken.capture.json --chain-id 84532 --expect bc_example --offline
bao b20 replay --input b20-direct-fixed.capture.json --chain-id 84532 --expect bc_example --offlineStart with the CLI guide or technical pilot kit. The B20 package is an unreleased candidate.