Transaction Signature Validation for Sapling

Terminology

The key words "MUST" and "MUST NOT" in this document are to be interpreted as described in BCP 14¹ when, and only when, they appear in all capitals.

The terms "consensus branch", "epoch", and "network upgrade" in this document are to be interpreted as described in ZIP 200.²

The term "Sapling" in this document is to be interpreted as described in ZIP 205.³

Abstract

This proposal defines a new transaction digest algorithm for signature validation from the Sapling network upgrade, to account for the presence of Sapling shielded inputs and outputs in transactions.

Motivation

The Sapling network upgrade introduced new shielded inputs and outputs. We want these to be covered by the transaction digest algorithm used for signatures, in order to ensure they are correctly bound.

Specification

A new transaction digest algorithm is defined:

BLAKE2b-256 hash of the serialization of:
  1. header of the transaction (4-byte little endian)
  2. nVersionGroupId of the transaction (4-byte little endian)
  3. hashPrevouts (32-byte hash)
  4. hashSequence (32-byte hash)
  5. hashOutputs (32-byte hash)
  6. hashJoinSplits (32-byte hash)
  7. hashShieldedSpends (32-byte hash)
  8. hashShieldedOutputs (32-byte hash)
  9. nLockTime of the transaction (4-byte little endian)
 10. nExpiryHeight of the transaction (4-byte little endian)
 11. valueBalance of the transaction (8-byte little endian)
 12. sighash type of the signature (4-byte little endian)

 13. If we are computing a transaction digest for a transparent input (i.e. this hash is not for
     a JoinSplit signature, Spend authorization signature, or binding signature):
     a. outpoint (32-byte hash + 4-byte little endian) 
     b. scriptCode of the input (serialized as scripts inside CTxOuts)
     c. value of the output spent by this input (8-byte little endian)
     d. nSequence of the input (4-byte little endian)

The new algorithm is based on the transaction digest algorithm defined in ZIP 143⁴.

The new algorithm MUST be used for signatures created over the Sapling transaction format⁵. Combined with the new consensus rule that v3 transaction formats will be invalid from the Sapling upgrade, this effectively means that all transaction signatures from the Sapling activation height (as specified in⁶) will use the new algorithm.

The BLAKE2b-256 personalization field⁷ is set to:

"ZcashSigHash" || CONSENSUS_BRANCH_ID

CONSENSUS_BRANCH_ID is the 4-byte little-endian encoding of the consensus branch ID for the epoch of the block containing the transaction.⁸ Domain separation of the signature hash across parallel consensus branches provides replay protection: transactions targeted for one consensus branch will have invalid signatures on other consensus branches.

Transaction creators MUST specify the epoch they want their transaction to be mined in. Across a network upgrade, this means that if a transaction is not mined before the activation height, it will never be mined.

Semantics of the original sighash types are as in ZIP 143⁹.

Field definitions

The items 1, 2, 3, 4, 5, 9, 10, 12, and 13 have the same meaning as in ZIP 143¹⁰.

6: hashJoinSplits

• If vjoinsplits is non-empty, hashJoinSplits is the BLAKE2b-256 hash of the serialization of all JoinSplit descriptions (in their canonical v4 transaction serialization format) concatenated with the joinSplitPubKey;
  • The BLAKE2b-256 personalization field is set to ZcashJSplitsHash.
  • Note that while signatures are omitted, the JoinSplit proofs are included in the signature hash, as with v1, v2, and v3 transactions.
• Otherwise, hashJoinSplits is a uint256 of 0x0000......0000.

7: hashShieldedSpends

• If vShieldedSpend is non-empty, hashShieldedSpends is the BLAKE2b-256 hash of the serialization of all Spend Descriptions (in their canonical transaction serialization format minus spendAuthSig);
  • The BLAKE2b-256 personalization field is set to ZcashSSpendsHash.
  • Note that the Spend proofs are included in the signature hash, as with JoinSplit proofs in v1, v2, and v3 transactions.
• Otherwise, hashShieldedSpends is a uint256 of 0x0000......0000.

8: hashShieldedOutputs

• If vShieldedOutput is non-empty, hashShieldedOutputs is the BLAKE2b-256 hash of the serialization of all Output Descriptions (in their canonical transaction serialization format);
  • The BLAKE2b-256 personalization field is set to ZcashSOutputHash.
  • Note that the Output proofs are included in the signature hash, as with JoinSplit proofs in v1, v2, and v3 transactions.
• Otherwise, hashShieldedOutputs is a uint256 of 0x0000......0000.

11: valueBalance

An 8-byte signed two's-complement little-endian value of the net amount, in zatoshi, exiting the Sapling value pool. For clarity, a negative value corresponds to an amount entering the Sapling value pool.

Notes

The hashPrevouts, hashSequence, hashOutputs, hashJoinSplits, hashShieldedSpends, and hashShieldedOutputs calculated in an earlier validation can be reused in other inputs of the same transaction, so that the time complexity of the whole hashing process reduces from O(n²) to O(n).

Refer to the reference implementation, reproduced below, for the precise algorithm:

const unsigned char ZCASH_PREVOUTS_HASH_PERSONALIZATION[16] =
    {'Z','c','a','s','h','P','r','e','v','o','u','t','H','a','s','h'};
const unsigned char ZCASH_SEQUENCE_HASH_PERSONALIZATION[16] =
    {'Z','c','a','s','h','S','e','q','u','e','n','c','H','a','s','h'};
const unsigned char ZCASH_OUTPUTS_HASH_PERSONALIZATION[16] =
    {'Z','c','a','s','h','O','u','t','p','u','t','s','H','a','s','h'};
const unsigned char ZCASH_JOINSPLITS_HASH_PERSONALIZATION[16] =
    {'Z','c','a','s','h','J','S','p','l','i','t','s','H','a','s','h'};
const unsigned char ZCASH_SHIELDED_SPENDS_HASH_PERSONALIZATION[16] =
    {'Z','c','a','s','h','S','S','p','e','n','d','s','H','a','s','h'};
const unsigned char ZCASH_SHIELDED_OUTPUTS_HASH_PERSONALIZATION[16] =
    {'Z','c','a','s','h','S','O','u','t','p','u','t','H','a','s','h'};

// The default values are zeroes
uint256 hashPrevouts;
uint256 hashSequence;
uint256 hashOutputs;
uint256 hashJoinSplits;
uint256 hashShieldedSpends;
uint256 hashShieldedOutputs;

if (!(nHashType & SIGHASH_ANYONECANPAY)) {
    CBLAKE2bWriter ss(SER_GETHASH, 0, ZCASH_PREVOUTS_HASH_PERSONALIZATION);
    for (unsigned int n = 0; n < txTo.vin.size(); n++) {
        ss << txTo.vin[n].prevout;
    }
    hashPrevouts = ss.GetHash();
}

if (!(nHashType & SIGHASH_ANYONECANPAY) && (nHashType & 0x1f) != SIGHASH_SINGLE && (nHashType & 0x1f) != SIGHASH_NONE) {
    CBLAKE2bWriter ss(SER_GETHASH, 0, ZCASH_SEQUENCE_HASH_PERSONALIZATION);
    for (unsigned int n = 0; n < txTo.vin.size(); n++) {
        ss << txTo.vin[n].nSequence;
    }
    hashSequence = ss.GetHash();
}

if ((nHashType & 0x1f) != SIGHASH_SINGLE && (nHashType & 0x1f) != SIGHASH_NONE) {
    CBLAKE2bWriter ss(SER_GETHASH, 0, ZCASH_OUTPUTS_HASH_PERSONALIZATION);
    for (unsigned int n = 0; n < txTo.vout.size(); n++) {
        ss << txTo.vout[n];
    }
    hashOutputs = ss.GetHash();
} else if ((nHashType & 0x1f) == SIGHASH_SINGLE && nIn < txTo.vout.size()) {
    CBLAKE2bWriter ss(SER_GETHASH, 0, ZCASH_OUTPUTS_HASH_PERSONALIZATION);
    ss << txTo.vout[nIn];
    hashOutputs = ss.GetHash();
}

if (!txTo.vjoinsplit.empty()) {
    CBLAKE2bWriter ss(SER_GETHASH, 0, ZCASH_JOINSPLITS_HASH_PERSONALIZATION);
    for (unsigned int n = 0; n < txTo.vjoinsplit.size(); n++) {
        ss << txTo.vjoinsplit[n];
    }
    ss << txTo.joinSplitPubKey;
    hashJoinSplits = ss.GetHash();
}

if (!txTo.vShieldedSpend.empty()) {
    CBLAKE2bWriter ss(SER_GETHASH, 0, ZCASH_SHIELDED_SPENDS_HASH_PERSONALIZATION);
    for (unsigned int n = 0; n < txTo.vShieldedSpend.size(); n++) {
        ss << txTo.vShieldedSpend[n].cv;
        ss << txTo.vShieldedSpend[n].anchor;
        ss << txTo.vShieldedSpend[n].nullifier;
        ss << txTo.vShieldedSpend[n].rk;
        ss << txTo.vShieldedSpend[n].zkproof;
    }
    hashShieldedSpends = ss.GetHash();
}

if (!txTo.vShieldedOutput.empty()) {
    CBLAKE2bWriter ss(SER_GETHASH, 0, ZCASH_SHIELDED_OUTPUTS_HASH_PERSONALIZATION);
    for (unsigned int n = 0; n < txTo.vShieldedOutput.size(); n++) {
        ss << txTo.vShieldedOutput[n];
    }
    hashShieldedOutputs = ss.GetHash();
}

uint32_t leConsensusBranchId = htole32(consensusBranchId);
unsigned char personalization[16] = {};
memcpy(personalization, "ZcashSigHash", 12);
memcpy(personalization+12, &leConsensusBranchId, 4);

CBLAKE2bWriter ss(SER_GETHASH, 0, personalization);
// fOverwintered and nVersion
ss << txTo.GetHeader();
// Version group ID
ss << txTo.nVersionGroupId;
// Input prevouts/nSequence (none/all, depending on flags)
ss << hashPrevouts;
ss << hashSequence;
// Outputs (none/one/all, depending on flags)
ss << hashOutputs;
// JoinSplit descriptions
ss << hashJoinSplits;
// Spend descriptions
ss << hashShieldedSpends;
// Output descriptions
ss << hashShieldedOutputs;
// Locktime
ss << txTo.nLockTime;
// Expiry height
ss << txTo.nExpiryHeight;
// Sapling value balance
ss << txTo.valueBalance;
// Sighash type
ss << nHashType;

if (nIn != NOT_AN_INPUT) {
    // The input being signed (replacing the scriptSig with scriptCode + amount)
    // The prevout may already be contained in hashPrevout, and the nSequence
    // may already be contained in hashSequence.
    ss << txTo.vin[nIn].prevout;
    ss << static_cast<const CScriptBase&>(scriptCode);
    ss << amount;
    ss << txTo.vin[nIn].nSequence;
}

return ss.GetHash();

Example

To ensure consistency in consensus-critical behaviour, developers should test their implementations against the ZIP 243 test vectors¹¹. The first two test vectors are broken out below for clarity. Note that 32-byte values below are exactly as the hash function returns, and are not reversed. Further examples can be found in the SignatureHash test data¹².

The sample transactions below and in¹³ are intended only for testing implementations of the transaction digest algorithm; they do not necessarily pass full validation.

Test vector 1

Raw transaction:

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header:          04000080
nVersionGroupId: 85202f89
vin:             00
vout:            02 e7719811893e0000 095200ac6551ac636565
                    b2835a0805750200 025151
nLockTime:       481cdd86
nExpiryHeight:   b3cc4318
valueBalance:    442117623ceb0500
vShieldedSpend:  03
  cv:           1b3d1a027c2c40590958b7eb13d742a997738c46a458965baf276ba92f272c72
  anchor:       1fe01f7e9c8e36d6a5e29d4e30a73594bf5098421c69378af1e40f64e125946f
  nullifier:    62c2fa7b2fecbcb64b6968912a6381ce3dc166d56a1d62f5a8d7551db5fd9313
  rk:           25c9a138f49b1a537edcf04be34a9851a7af9db6990ed83dd64af3597c04323e
  zkproof:      a51b0052ad8084a8b9da948d320dadd64f5431e61ddf658d24ae67c22c8d1309131fc00fe7f235734276d38d47f1e191e00c7a1d48af046827591e9733a97fa6b679f3dc601d008285edcbdae69ce8fc1be4aac00ff2711ebd931de518856878f73476f21a482ec9378365c8f7393c94e2885315eb4671098b79535e790fe53e29fef2b3766697ac32b4f473f468a008e72389fc03880d780cb07fcfaabe3f1a84b27db59a4a153d882d2b2103596555ed9494c6ac893c49723833ec8926c103
  spendAuthSig: 9586a7afcf4a0d9c731e985d99589c8bb838e8aaf745533ed9e8ae3a1cd074a51a20da8aba18d1dbebbc862ded42435e92476930d069896cff30eb414f727b89

  cv:           5a4b7be1769367e1fe8ad18de11e58d88a0ad5511d3525122b7b0a6f25d28b16
  anchor:       457e745939ffedbd12863ce71a02af117d417adb3d15cc54dcb1fce467500c6b
  nullifier:    8fb86b12b56da9c382857deecc40a98d5f2935395ee4762dd21afdbb5d47fa9a
  rk:           6dd984d567db2857b927b7fae2db587105415d4642789d38f50b8dbcc129cab3
  zkproof:      d17d19f3355bcf73cecb8cb8a5da01307152f13936a270572670dc82d39026c6cb4cd4b0f7f5aa2a4f5a5341ec5dd715406f2fdd2afa733f5f641c8c21862a1bafce2609d9eecfa158cfb5cd79f88008e315dc7d8388e76c1782fd2795d18a763624c25fa959cc97489ce75745824b77868c53239cfbdf73caec65604037314faaceb56218c6bd30f8374ac13386793f21a9fb80ad03bc0cda4a44946c00e1b1a1df0e5b87b5bece477a709649e950060591394812951e1fe3895b8cc3d14d2c
  spendAuthSig: f6556df6ed4b4ddd3d9a69f53357d7767f4f5ccbdbc596631277f8fecd08cb056b95e3025b9792fff7f244fc716269b926d62e9596fa825c6bf21aff9e68625a

  cv:           6b4cbc4b700a364fa76bd8298bc3ec608d4cf7f3566658d5588714ec9448b0f0
  anchor:       396128aef884a646114c9f1a6df56319033c3199cc7a09e9e9567482c9269539
  nullifier:    0229407bbc48985675e3f874a4533f1d63a84dfa3e0f460fe2f57e34fbc75423
  rk:           b6883a50a0d470190dfba10a857f82842d3825b3d6da0573d316eb160dc0b716
  zkproof:      c48fbd467f75b780149ae8808f4e68f50c0536acddf6f1aeab016b6bc1ec144b4e553acfd670f77e755fc88e0677e31ba459b44e307768958fe3789d41c2b1ff434cb30e15914f01bc6bc2307b488d2556d7b7380ea4ffd712f6b02fe806b94569cd4059f396bf29b99d0a40e5e1711ca944f72d436a102fca4b97693da0b086fe9d2e7162470d02e0f05d4bec9512bfb3f38327296efaa74328b118c27402c70c3a90b49ad4bbc68e37c0aa7d9b3fe17799d73b841e751713a02943905aae08
  spendAuthSig: 03fd69442eb7681ec2a05600054e92eed555028f21b6a155268a2dd6640a69301a52a38d4d9f9f957ae35af7167118141ce4c9be0a6a492fe79f1581a155fa3a

vShieldedOutput: 03
  cv:            4999c538f7a758bb5b1d28fd218fba1938744bdb77b4a4dfa7a5fae96e8cd49b
  cmu:           26907dfc6685c5c99b7141ac626ab4761fd3f41e728e1a28f89db89ffdeca364
  ephemeralKey:  e4b22d81d9968d0119e4c7a189adf22ad96830a54e40dc73eaba6b2aaf14f7ca
  encCiphertext: 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
  outCiphertext: cd8e97862dab7be1e8d399c05ef27c6e22ee273e15786e394c8f1be31682a30147963ac8da8d41d804258426a3f70289b8ad19d8de13be4eebe3bd4c8a6f55d6e0c373d456851879f5fbc282db9e1348
  zkproof:       06bff71e11bc33ab75dd6ca067fb73a043b646a7cf39cab4928386786d2f24141ee120fdc34d6764eafc66880ee0204f53cc1167ed20b43a52dea3ca7cff8ef35cd8e6d7c111a68ef44bcd0c1513ad47ca61c659cc5d325b440f6b9f59aff66879bb6688fd2859362b182f207b3175961f6411a493bffd048e7d0d87d82fe6f990a2b0a25f5aa0111a6e68f37bf6f3ac2d26b84686e569d58d99c1383597fad81193c4c1b16e6a90e2d507cdfe6fbdaa86163e9cf5de3100fbca7e8da047b090

  cv:            79362d7792deb3ca9dc1561b87c82e3cb99eb5837319582216a3226774efa90e
  cmu:           fb7bfc79f425644e4e98c2d7d8642b9db82aa739bf2d71cc4117227db227cf0a
  ephemeralKey:  05ad9a95832e23c94f271ca0e4694fac6322282ebac6986b8fdc8ad863084ff1
  encCiphertext: 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
  outCiphertext: 5bec0c9eef2db97d22b2b3556cc969fbb13d06509765a52b3fac54b93f421bf08e18d52ddd52cc1c8ca8adfaccab7e5cc2f4573fbbf8239bb0b8aedbf8dad16282da5c9125dba1c059d0df8abf621078
  zkproof:       f02d6c4bc86d40845ac1d59710c45f07d585eb48b32fc0167ba256e73ca3b9311c62d109497957d8dbe10aa3e866b40c0baa2bc492c19ad1e6372d9622bf163fbffeaeee796a3cd9b6fbbfa4d792f34d7fd6e763cd5859dd26833d21d9bc5452bd19515dff9f4995b35bc0c1f876e6ad11f2452dc9ae85aec01fc56f8cbfda75a7727b75ebbd6bbffb43b63a3b1b671e40feb0db002974a3c3b1a788567231bf6399ff89236981149d423802d2341a3bedb9ddcbac1fe7b6435e1479c72e7089

  cv:            b51bfe2ff345857da9b545e88e3221f3f5f72d1e069c9a85dd2236d390989587
  cmu:           be005cda16af4408f3ab06a916eeeb9c9594b70424a4c1d171295b6763b22f47
  ephemeralKey:  12ba7beff0ff27883afaff26034b895735709cf937bd2231891e70eb2771e992
  encCiphertext: 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
  outCiphertext: 6ae10280a032440c420a421e944d1e952b70d5826cd3b08b7db9630fe4fd5f22125de840fcc40b98038af11d55be25432597b4b65b9ec1c7a8bbfd052cbf7e1c1785314934b262d5853754f1f17771cf
  zkproof:       b7503072655753fa3f54ecc587e9f83b581916092df26e63e18994cb0db91a0bbdc7b6119b32222adf5e61d8d8ae89dae4954b54813bb33f08d562ba513fee1b09c0fcd516055419474dd7fda038a89c84ea7b9468287f0eb0c10c4b132520194d3d8d5351fc10d09c15c8cc101aa1663bbf17b84111f38bb439f07353bdea3596d15e713e1e2e7d3f1c383135b47fa7f81f46df7a902a404699ec912f5656c35b85763e4de583aecaa1dfd5d2677d9c8ffee877f63f40a5ca0d67f6e5541247

vJoinSplit:      00

bindingSig:      f805af876aeede53aa8b0f8e5604a73c30cbd09dad963d6f8a5dcc40def40797342113ba206fae8ebe4f3bc3caf69259e462eff9ba8b3f4bfaa1300c26925a87

Transaction digest with nIn = NOT_AN_INPUT and nHashType = 1 (SIGHASH_ALL):

hashPrevouts:
  BLAKE2b-256('ZcashPrevoutHash', '')
= d53a633bbecf82fe9e9484d8a0e727c73bb9e68c96e72dec30144f6a84afa136

hashSequence:
  BLAKE2b-256('ZcashSequencHash', '')
= a5f25f01959361ee6eb56a7401210ee268226f6ce764a4f10b7f29e54db37272

hashOutputs:
  BLAKE2b-256('ZcashOutputsHash', e7719811893e0000095200ac6551ac636565b2835a0805750200025151)
= ab6f7f6c5ad6b56357b5f37e16981723db6c32411753e28c175e15589172194a

hashShieldedSpends:
  BLAKE2b-256('ZcashSSpendsHash', 1b3d1a027c2c40590958b7eb13d742a997738c46a458965baf276ba92f272c721fe01f7e9c8e36d6a5e29d4e30a73594bf5098421c69378af1e40f64e125946f62c2fa7b2fecbcb64b6968912a6381ce3dc166d56a1d62f5a8d7551db5fd931325c9a138f49b1a537edcf04be34a9851a7af9db6990ed83dd64af3597c04323ea51b0052ad8084a8b9da948d320dadd64f5431e61ddf658d24ae67c22c8d1309131fc00fe7f235734276d38d47f1e191e00c7a1d48af046827591e9733a97fa6b679f3dc601d008285edcbdae69ce8fc1be4aac00ff2711ebd931de518856878f73476f21a482ec9378365c8f7393c94e2885315eb4671098b79535e790fe53e29fef2b3766697ac32b4f473f468a008e72389fc03880d780cb07fcfaabe3f1a84b27db59a4a153d882d2b2103596555ed9494c6ac893c49723833ec8926c1035a4b7be1769367e1fe8ad18de11e58d88a0ad5511d3525122b7b0a6f25d28b16457e745939ffedbd12863ce71a02af117d417adb3d15cc54dcb1fce467500c6b8fb86b12b56da9c382857deecc40a98d5f2935395ee4762dd21afdbb5d47fa9a6dd984d567db2857b927b7fae2db587105415d4642789d38f50b8dbcc129cab3d17d19f3355bcf73cecb8cb8a5da01307152f13936a270572670dc82d39026c6cb4cd4b0f7f5aa2a4f5a5341ec5dd715406f2fdd2afa733f5f641c8c21862a1bafce2609d9eecfa158cfb5cd79f88008e315dc7d8388e76c1782fd2795d18a763624c25fa959cc97489ce75745824b77868c53239cfbdf73caec65604037314faaceb56218c6bd30f8374ac13386793f21a9fb80ad03bc0cda4a44946c00e1b1a1df0e5b87b5bece477a709649e950060591394812951e1fe3895b8cc3d14d2c6b4cbc4b700a364fa76bd8298bc3ec608d4cf7f3566658d5588714ec9448b0f0396128aef884a646114c9f1a6df56319033c3199cc7a09e9e9567482c92695390229407bbc48985675e3f874a4533f1d63a84dfa3e0f460fe2f57e34fbc75423b6883a50a0d470190dfba10a857f82842d3825b3d6da0573d316eb160dc0b716c48fbd467f75b780149ae8808f4e68f50c0536acddf6f1aeab016b6bc1ec144b4e553acfd670f77e755fc88e0677e31ba459b44e307768958fe3789d41c2b1ff434cb30e15914f01bc6bc2307b488d2556d7b7380ea4ffd712f6b02fe806b94569cd4059f396bf29b99d0a40e5e1711ca944f72d436a102fca4b97693da0b086fe9d2e7162470d02e0f05d4bec9512bfb3f38327296efaa74328b118c27402c70c3a90b49ad4bbc68e37c0aa7d9b3fe17799d73b841e751713a02943905aae08)
= 3fd9edb96dccf5b9aeb71e3db3710e74be4f1dfb19234c1217af26181f494a36

hashShieldedOutputs:
  BLAKE2b-256('ZcashSOutputHash', 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)
= dafece799f638ba7268bf8fe43f02a5112f0bb32a84c4a8c2f508c41ff1c78b5

Preimage:
0400008085202f89d53a633bbecf82fe9e9484d8a0e727c73bb9e68c96e72dec30144f6a84afa136a5f25f01959361ee6eb56a7401210ee268226f6ce764a4f10b7f29e54db37272ab6f7f6c5ad6b56357b5f37e16981723db6c32411753e28c175e15589172194a00000000000000000000000000000000000000000000000000000000000000003fd9edb96dccf5b9aeb71e3db3710e74be4f1dfb19234c1217af26181f494a36dafece799f638ba7268bf8fe43f02a5112f0bb32a84c4a8c2f508c41ff1c78b5481cdd86b3cc4318442117623ceb050001000000

  header:              04000080
  nVersionGroupId:     85202f89
  hashPrevouts:        d53a633bbecf82fe9e9484d8a0e727c73bb9e68c96e72dec30144f6a84afa136
  hashSequence:        a5f25f01959361ee6eb56a7401210ee268226f6ce764a4f10b7f29e54db37272
  hashOutputs:         ab6f7f6c5ad6b56357b5f37e16981723db6c32411753e28c175e15589172194a
  hashJoinSplits:      0000000000000000000000000000000000000000000000000000000000000000
  hashShieldedSpends:  3fd9edb96dccf5b9aeb71e3db3710e74be4f1dfb19234c1217af26181f494a36
  hashShieldedOutputs: dafece799f638ba7268bf8fe43f02a5112f0bb32a84c4a8c2f508c41ff1c78b5
  nLockTime:           481cdd86
  nExpiryHeight:       b3cc4318
  valueBalance:        442117623ceb0500
  nHashType:           01000000

sighash: 63d18534de5f2d1c9e169b73f9c783718adbef5c8a7d55b5e7a37affa1dd3ff3

Test vector 2

Raw transaction: