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Transaction Lifecycle ("did the tx land?"):
- TxTracker polls eth_getTransactionReceipt for block inclusion
- Receipt fields: blockNumber, blockHash, receiptStatus, gasUsed, revertReason
- Confirmation counter with configurable target (default 12)
- StatusHistory records every state transition with timestamp and actor
- Stuck/dropped tx detection with webhook alerts
Backup Key Sharding (Secure Recovery Flow):
- GF(2^8) Shamir Secret Sharing (ShamirSplit/ShamirCombine)
- WalletBackup: AES-256-GCM encrypt key share, Shamir-split the key
- Labeled shard destinations: icloud, hsm, offline, custody, device
- Default 2-of-2 (iCloud + Platform HSM), institutional 3-of-5
Settlement & Intent Engine:
- Intent lifecycle: pending_sign → signed → co_signed → recorded → matched
- HSM co-signing as second signer in multisig flow
- Settlement with HSM multisig attestation collection
- TransferAgency hash registration and verification
- WalletBackup, Intent, Settlement DB models
API Routes:
- POST/GET /intents, /intents/:id/sign, /intents/:id/co-sign
- GET /settlements, /settlements/:id
- POST/GET /wallets/:id/backup
- New webhooks: tx.included, tx.finalized, tx.reverted, intent.*
40 tests passing across backup, settlement, txtracker, api packages.