Zcash (ZEC)

Reference for Zcash.

Field	Value
coinType	133
keyPath	m/44'/133'/<accountIdx>'/0/0
amount unit	zatoshi (1 ZEC = 1e8)
chainId	bip122:00040fe8ec8471911baa1db1266ea15d/slip44:133

Supported Methods

Method	Supported
getAddress	✓
signTransaction	✓
signMessage	✗
signTypedData	✗
signData	✗
signAuthEntry	✗

Notes

Fully signable UTXO chain. DCENT signs the transparent t-address path only — shielded z-addresses are not supported. The consensus branch ID is passed in option (below). For each input, pass the previous output in DCENT's simple format: 442743454e54ff20 + the txid in reversed byte order (32 bytes) + the output amount as an 8-byte big-endian hex — a raw Zcash transaction hex is rejected with -32602. Shares the Bitcoin-family signTransaction path.

option (consensus branch ID)

Zcash's option identifies which network upgrade is currently active. It is a 16-hex-char string: the first 8 chars are the currency's GroupId, the last 8 are the active consensus branch ID. Because the correct branch ID changes at every network-upgrade activation height and the signer has no network access, the app must supply the current value — a value baked in at build time is guaranteed to go stale eventually.

Field	Type	Required	Source	Notes
option, chars 1–8	hex	Required	App	GroupId — 892F2085 for Zcash.
option, chars 9–16	hex	Required	App	Active consensus branch ID — changes at every network-upgrade activation height. The signer accepts 37A5165B (NU6.3, from height 3,428,143) and 5437F330 (NU6.2, from height 3,364,600); any other value → -32602

danger

Don't hardcode this. Compute it at prepare time from the current chain height, and pass the result through unchanged. A GroupId that doesn't match, a branch ID the signer does not recognize, or a length other than 16 hex chars is rejected with -32602. A branch ID that is recognized but stale (for example NU6.2 after NU6.3 activated) is not detected — it still signs, so a successful signature does not prove the branch ID is current.

The signTransaction payload shape (inputs, outputs, previous transactions) matches the Bitcoin-family signing path — the address version, coinType, the previous-transaction format (rawTransaction) and the required option differ (see above). Per-parameter tables come from the DCENT Web Bridge and the connector presets.

signTransaction

await dcent.sign({
  method: 'signTransaction',
  chainId: 'bip122:00040fe8ec8471911baa1db1266ea15d/slip44:133',
  payload: {
    keyPath: "m/44'/133'/0'/0/0",
    transaction: {
      inputs: [
        { rawTransaction: '<DCENT simple-format prev output>', index: 0, txType: 'p2pkh', keyPath: "m/44'/133'/0'/0/0" }
      ],
      outputs: [
        { txType: 'p2pkh', amount: '990000', addresses: ['<t1... recipient>'] }
      ],
      option: '<16-hex-char GroupId+branchId, wallet-computed>'
    }
  }
})  // → body.parameter.signature

signTransaction — full field reference

Field	Type	Required	Source	Unit	Notes
inputs[].rawTransaction	hex	Required-Real	Wallet	—	The previous output in DCENT's simple format: 442743454e54ff20 + the txid in reversed byte order (32 bytes) + the output amount as an 8-byte big-endian hex. A raw Zcash transaction hex is rejected with -32602
inputs[].index	number	Required	App	—	UTXO output index
inputs[].txType	enum	Required	App	—	Always p2pkh — Zcash has no SegWit variant
inputs[].keyPath	string	Required-Real	Wallet	—	Path that signs this input
inputs[].sequence	number	Optional	App	—	When omitted, no sequence is sent and DCENT X then uses 0xffffffff (only Bitcoin mainnet defaults to 0xfffffffd, opt-in RBF). Each input's value must be a valid uint32, but only the first input's value is used, and it applies to every input (a first-input value of 0 is not sent, so the default applies).
outputs[].amount	string	Required	App	zatoshi	Output value
outputs[].addresses	string[]	Required-Real	App	—	Recipient (transparent t-address only). Only addresses[0] is signed (later entries are not signed, but a Bitcoin Taproot address (bc1p… / tb1p…) among them is rejected with -32602 — send a single address), exactly one non-change output allowed — use a second output with txType: 'change' for change. The change output's addresses[0] is a BIP-32 derivation path on your own account (for example m/44'/133'/0'/1/0), not an address — the device derives the change address from that path itself. Use a path on the account you are signing with; the full rule is on the Bitcoin page.
option	hex (16 chars)	Required	App	—	Consensus branch ID — sub-field breakdown above.

warning

Fee floor (ZIP-317). The fee is implicit — inputTotal − outputTotal. It must be at least the ZIP-317 conventional fee, 5000 × max(2, max(number of inputs, number of outputs)) zatoshi (for example 10,000 zatoshi for 1 input / 2 outputs). A lower fee is rejected with -32602; the signer does not adjust your amounts, so lower the output amounts to raise the fee.

• sign()
• Support Matrix
• Error Codes