Scan and spend keys
Your reusable code encodes two public keys. The scan key finds payments; the spend key authorizes moving them. Neither reveals a transaction history.
BIP-352
Bitcoin payments without publishing a fresh address for every request.
Live derivation
One code. A fresh destination for every payment.
The reusable code below never changes. Watch a distinct Bitcoin output resolve for each payment, with no address published on-chain twice.
Reusable payment code
sp1qqgste7k9…juexzkBIP-352The mechanism
How a shared code becomes a private output.
BIP-352 uses elliptic-curve Diffie–Hellman between the sender's inputs and your published scan and spend keys. The math happens off-chain; only ordinary-looking taproot outputs land on the ledger.
Shared secret per payment
The sender combines their transaction inputs with your scan key to compute a shared secret, then derives a fresh output public key. Two payments never collide.
Local discovery
Your wallet recomputes the same secret from chain data and its scan key, recognising outputs meant for you—without a server learning which ones matched.
Taproot on-chain
Detected outputs are standard taproot outputs. Observers see normal Bitcoin activity, not a labelled reusable address.
Receive
One code, new outputs.
Your Silent Payment code can be presented repeatedly. Compatible senders create distinct outputs, reducing the address-reuse trail of conventional requests.
Receiving requires wallet scanning. The beta surfaces scanning and sync state rather than implying a payment has arrived early.
Send
Validate, review, sign, broadcast.
ColdHarbor validates a BIP-352 destination, resolves the payment output, shows amount and fees, then asks for local approval.
- 01Paste or scan a Silent Payment code
- 02Enter amount and review fee detail
- 03Authorize local signing
- 04Wait for network acceptance
Address formats
ColdHarbor accepts Silent Payment codes only.
- sp1
- Mainnet Silent Payment code. Reserved for a future public mainnet release.
- tsp1
- Testnet Silent Payment code for signet and testnet evaluation.
- sprt1
- Regtest Silent Payment code used throughout the current private beta.
- Legacy · SegWit
- Reused single-use addresses are intentionally not presented for receiving.
Product boundary
Silent Payments are the Bitcoin payment rail.
Bitcoin can be sent and received through BIP-352. Monero and other privacy assets are separate asset systems and are never labeled as Silent Payments.