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/**
* MRC20 Token Verification
*
* Verifies MRC20 state chain integrity and extracts transfer operations.
* Used by the pay middleware to accept token deposits.
*
* MRC20 profile: mono.mrc20.v0.1
* State chain: each state links to previous via SHA-256 of JCS-encoded state.
*
* References:
* - Blocktrails: https://blocktrails.org/
* - JCS (RFC 8785): JSON Canonicalization Scheme
*/
import
crypto
from
'crypto'
;
import
{
secp256k1
}
from
'@noble/curves/secp256k1'
;
const
MRC20_PROFILE
=
'mono.mrc20.v0.1'
;
const
TRANSFER_OP
=
'urn:mono:op:transfer'
;
// --- BIP-341 key chaining constants ---
const
SECP_N
=
BigInt
(
'0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141'
)
;
const
BECH32_CHARSET
=
'qpzry9x8gf2tvdw0s3jn54khce6mua7l'
;
const
BECH32M
=
0x2bc830a3
;
/**
* JSON Canonicalization Scheme (RFC 8785)
* Produces deterministic JSON — sorted keys, no whitespace.
*
@param
{
*
} obj
*
@returns
{
string
}
*/
export
function
jcs
(
obj
)
{
if
(
obj
===
null
||
typeof
obj
!==
'object'
)
return
JSON
.
stringify
(
obj
)
;
if
(
Array
.
isArray
(
obj
)
)
return
'['
+
obj
.
map
(
v
=>
jcs
(
v
)
)
.
join
(
','
)
+
']'
;
const
keys
=
Object
.
keys
(
obj
)
.
sort
(
)
;
return
'{'
+
keys
.
map
(
k
=>
JSON
.
stringify
(
k
)
+
':'
+
jcs
(
obj
[
k
]
)
)
.
join
(
','
)
+
'}'
;
}
/**
* SHA-256 hex digest of a string
*
@param
{
string
} str
*
@returns
{
string
} Hex hash
*/
export
function
sha256Hex
(
str
)
{
return
crypto
.
createHash
(
'sha256'
)
.
update
(
str
)
.
digest
(
'hex'
)
;
}
/**
* Verify state chain link: state.prev must equal SHA-256(JCS(prevState))
*
@param
{
object
} state - Current state
*
@param
{
object
} prevState - Previous state
*
@returns
{
{valid: boolean, error?: string}
}
*/
export
function
verifyStateLink
(
state
,
prevState
)
{
if
(
!
state
||
!
prevState
)
{
return
{
valid
:
false
,
error
:
'Missing state or prevState'
}
;
}
const
expectedPrev
=
sha256Hex
(
jcs
(
prevState
)
)
;
if
(
state
.
prev
!==
expectedPrev
)
{
return
{
valid
:
false
,
error
:
`State chain break: expected prev
${
expectedPrev
}
, got
${
state
.
prev
}
`
}
;
}
// Verify sequence number
if
(
typeof
state
.
seq
===
'number'
&&
typeof
prevState
.
seq
===
'number'
)
{
if
(
state
.
seq
!==
prevState
.
seq
+
1
)
{
return
{
valid
:
false
,
error
:
`Sequence mismatch: expected
${
prevState
.
seq
+
1
}
, got
${
state
.
seq
}
`
}
;
}
}
return
{
valid
:
true
}
;
}
/**
* Validate that a state object is a valid MRC20 state
*
@param
{
object
} state
*
@returns
{
{valid: boolean, error?: string}
}
*/
export
function
validateMrc20State
(
state
)
{
if
(
!
state
||
typeof
state
!==
'object'
)
{
return
{
valid
:
false
,
error
:
'State must be an object'
}
;
}
if
(
state
.
profile
!==
MRC20_PROFILE
)
{
return
{
valid
:
false
,
error
:
`Invalid profile: expected
${
MRC20_PROFILE
}
, got
${
state
.
profile
}
`
}
;
}
if
(
!
Array
.
isArray
(
state
.
ops
)
)
{
return
{
valid
:
false
,
error
:
'State must have ops array'
}
;
}
if
(
typeof
state
.
prev
!==
'string'
)
{
return
{
valid
:
false
,
error
:
'State must have prev hash'
}
;
}
return
{
valid
:
true
}
;
}
/**
* Extract transfer operations targeting a specific address
*
@param
{
object
} state - MRC20 state
*
@param
{
string
} toAddress - Recipient address to filter by
*
@returns
{
Array<{from: string, to: string, amt: number}>
} Matching transfers
*/
export
function
extractTransfersTo
(
state
,
toAddress
)
{
if
(
!
state
.
ops
||
!
Array
.
isArray
(
state
.
ops
)
)
return
[
]
;
return
state
.
ops
.
filter
(
op
=>
op
.
op
===
TRANSFER_OP
&&
op
.
to
===
toAddress
&&
typeof
op
.
amt
===
'number'
&&
op
.
amt
>
0
)
;
}
/**
* Get total amount transferred to an address in a state
*
@param
{
object
} state - MRC20 state
*
@param
{
string
} toAddress - Recipient address
*
@returns
{
number
} Total amount transferred
*/
export
function
totalTransferredTo
(
state
,
toAddress
)
{
const
transfers
=
extractTransfersTo
(
state
,
toAddress
)
;
return
transfers
.
reduce
(
(
sum
,
op
)
=>
sum
+
op
.
amt
,
0
)
;
}
/**
* Verify an MRC20 deposit: validate state chain + extract transfer amount
*
@param
{
object
} params
*
@param
{
object
} params.state - New state containing transfer ops
*
@param
{
object
} params.prevState - Previous state (for chain verification)
*
@param
{
string
} params.toAddress - Pod's address to check transfers against
*
@returns
{
{valid: boolean, amount: number, ticker?: string, error?: string}
}
*/
export
function
verifyMrc20Deposit
(
params
)
{
const
{
state
,
prevState
,
toAddress
}
=
params
;
// Validate MRC20 format
const
stateCheck
=
validateMrc20State
(
state
)
;
if
(
!
stateCheck
.
valid
)
return
{
valid
:
false
,
amount
:
0
,
error
:
stateCheck
.
error
}
;
const
prevCheck
=
validateMrc20State
(
prevState
)
;
if
(
!
prevCheck
.
valid
)
return
{
valid
:
false
,
amount
:
0
,
error
:
`prevState:
${
prevCheck
.
error
}
`
}
;
// Verify state chain link
const
linkCheck
=
verifyStateLink
(
state
,
prevState
)
;
if
(
!
linkCheck
.
valid
)
return
{
valid
:
false
,
amount
:
0
,
error
:
linkCheck
.
error
}
;
// Extract transfers to pod
const
amount
=
totalTransferredTo
(
state
,
toAddress
)
;
if
(
amount
<=
0
)
{
return
{
valid
:
false
,
amount
:
0
,
error
:
`No transfers to
${
toAddress
}
found in state ops`
}
;
}
return
{
valid
:
true
,
amount
,
ticker
:
state
.
ticker
||
'UNKNOWN'
}
;
}
// --- BIP-341 key chaining (blocktrails anchor verification) ---
function
sha256Bytes
(
data
)
{
const
buf
=
data
instanceof
Uint8Array
?
Buffer
.
from
(
data
)
:
Buffer
.
from
(
data
,
'utf8'
)
;
return
new
Uint8Array
(
crypto
.
createHash
(
'sha256'
)
.
update
(
buf
)
.
digest
(
)
)
;
}
function
concatBytes
(
...
arrays
)
{
const
total
=
arrays
.
reduce
(
(
s
,
a
)
=>
s
+
a
.
length
,
0
)
;
const
result
=
new
Uint8Array
(
total
)
;
let
off
=
0
;
for
(
const
a
of
arrays
)
{
result
.
set
(
a
,
off
)
;
off
+=
a
.
length
;
}
return
result
;
}
function
bytesToBigInt
(
bytes
)
{
let
r
=
0n
;
for
(
const
b
of
bytes
)
r
=
(
r
<<
8n
)
|
BigInt
(
b
)
;
return
r
;
}
function
hexToU8
(
hex
)
{
const
bytes
=
new
Uint8Array
(
hex
.
length
/
2
)
;
for
(
let
i
=
0
;
i
<
bytes
.
length
;
i
++
)
bytes
[
i
]
=
parseInt
(
hex
.
slice
(
i
*
2
,
i
*
2
+
2
)
,
16
)
;
return
bytes
;
}
function
bytesToHex
(
bytes
)
{
return
Array
.
from
(
bytes
)
.
map
(
b
=>
b
.
toString
(
16
)
.
padStart
(
2
,
'0'
)
)
.
join
(
''
)
;
}
function
taggedHash
(
tag
,
...
msgs
)
{
const
tagHash
=
sha256Bytes
(
Buffer
.
from
(
tag
,
'utf8'
)
)
;
return
sha256Bytes
(
concatBytes
(
tagHash
,
tagHash
,
...
msgs
)
)
;
}
function
btScalar
(
pubkeyCompressed
,
state
)
{
const
xOnly
=
pubkeyCompressed
.
slice
(
1
)
;
const
stateBytes
=
typeof
state
===
'string'
?
Buffer
.
from
(
state
,
'utf8'
)
:
state
;
const
sh
=
sha256Bytes
(
stateBytes
)
;
return
bytesToBigInt
(
taggedHash
(
'TapTweak'
,
xOnly
,
sh
)
)
%
SECP_N
;
}
function
btDeriveChainedPubkey
(
pubkeyBase
,
states
)
{
let
P
=
secp256k1
.
ProjectivePoint
.
fromHex
(
bytesToHex
(
pubkeyBase
)
)
;
let
cur
=
pubkeyBase
;
for
(
const
s
of
states
)
{
const
t
=
btScalar
(
cur
,
s
)
;
P
=
P
.
add
(
secp256k1
.
ProjectivePoint
.
BASE
.
multiply
(
t
)
)
;
cur
=
new
Uint8Array
(
P
.
toRawBytes
(
true
)
)
;
}
return
cur
;
}
// --- Bech32m encoding ---
function
convertBits
(
data
,
from
,
to
,
pad
)
{
let
acc
=
0
,
bits
=
0
;
const
ret
=
[
]
,
maxv
=
(
1
<<
to
)
-
1
;
for
(
const
v
of
data
)
{
acc
=
(
acc
<<
from
)
|
v
;
bits
+=
from
;
while
(
bits
>=
to
)
{
bits
-=
to
;
ret
.
push
(
(
acc
>>
bits
)
&
maxv
)
;
}
}
if
(
pad
&&
bits
>
0
)
ret
.
push
(
(
acc
<<
(
to
-
bits
)
)
&
maxv
)
;
return
ret
;
}
function
hrpExpand
(
hrp
)
{
const
r
=
[
]
;
for
(
const
c
of
hrp
)
r
.
push
(
c
.
charCodeAt
(
0
)
>>
5
)
;
r
.
push
(
0
)
;
for
(
const
c
of
hrp
)
r
.
push
(
c
.
charCodeAt
(
0
)
&
31
)
;
return
r
;
}
function
polymod
(
values
)
{
const
GEN
=
[
0x3b6a57b2
,
0x26508e6d
,
0x1ea119fa
,
0x3d4233dd
,
0x2a1462b3
]
;
let
chk
=
1
;
for
(
const
v
of
values
)
{
const
b
=
chk
>>
25
;
chk
=
(
(
chk
&
0x1ffffff
)
<<
5
)
^
v
;
for
(
let
i
=
0
;
i
<
5
;
i
++
)
if
(
(
b
>>
i
)
&
1
)
chk
^=
GEN
[
i
]
;
}
return
chk
;
}
function
bech32mEncode
(
hrp
,
version
,
program
)
{
const
conv
=
convertBits
(
program
,
8
,
5
,
true
)
;
const
values
=
[
version
,
...
conv
]
;
const
enc
=
[
...
hrpExpand
(
hrp
)
,
...
values
,
0
,
0
,
0
,
0
,
0
,
0
]
;
const
mod
=
polymod
(
enc
)
^
BECH32M
;
const
checksum
=
[
0
,
1
,
2
,
3
,
4
,
5
]
.
map
(
i
=>
(
mod
>>
(
5
*
(
5
-
i
)
)
)
&
31
)
;
let
result
=
hrp
+
'1'
;
for
(
const
v
of
[
...
values
,
...
checksum
]
)
result
+=
BECH32_CHARSET
[
v
]
;
return
result
;
}
/**
* Derive the taproot address for a state chain
*
@param
{
string
} pubkeyHex - Issuer's compressed pubkey (66-char hex)
*
@param
{
string[]
} states - JCS-encoded state strings
*
@param
{
string
} [network='testnet4'] - 'testnet4' or 'mainnet'
*
@returns
{
string
} Bech32m taproot address
*/
export
function
btAddress
(
pubkeyHex
,
states
,
network
=
'testnet4'
)
{
const
pubkeyBase
=
hexToU8
(
pubkeyHex
)
;
const
P
=
btDeriveChainedPubkey
(
pubkeyBase
,
states
)
;
const
xOnly
=
P
.
slice
(
1
)
;
const
hrp
=
network
===
'mainnet'
?
'bc'
:
'tb'
;
return
bech32mEncode
(
hrp
,
1
,
xOnly
)
;
}
/**
* Verify that an MRC20 state is anchored to a Bitcoin UTXO
*
@param
{
object
} params
*
@param
{
object
} params.state - Current state with transfer ops
*
@param
{
object
} params.prevState - Previous state (chain verification)
*
@param
{
string
} params.toAddress - Pod's address for transfer verification
*
@param
{
string
} params.pubkey - Issuer's compressed pubkey (66-char hex)
*
@param
{
string[]
} params.stateStrings - All JCS state strings (genesis to current)
*
@param
{
string
} [params.mempoolUrl] - Mempool API base URL
*
@param
{
string
} [params.network] - 'testnet4' or 'mainnet'
*
@returns
{
Promise<{valid: boolean, amount?: number, ticker?: string, address?: string, error?: string}>
}
*/
export
async
function
verifyMrc20Anchor
(
params
)
{
const
{
state
,
prevState
,
toAddress
,
pubkey
,
stateStrings
,
mempoolUrl
=
'https://mempool.space/testnet4'
,
network
=
'testnet4'
}
=
params
;
// 1. Standard deposit verification (chain integrity + transfers)
const
depositCheck
=
verifyMrc20Deposit
(
{
state
,
prevState
,
toAddress
}
)
;
if
(
!
depositCheck
.
valid
)
return
depositCheck
;
// 2. Verify stateStrings is provided and non-empty
if
(
!
Array
.
isArray
(
stateStrings
)
||
stateStrings
.
length
===
0
)
{
return
{
valid
:
false
,
amount
:
0
,
error
:
'stateStrings required for anchor verification'
}
;
}
// 3. Verify pubkey is provided
if
(
!
pubkey
||
typeof
pubkey
!==
'string'
||
pubkey
.
length
!==
66
)
{
return
{
valid
:
false
,
amount
:
0
,
error
:
'pubkey must be a 66-char compressed pubkey hex'
}
;
}
// 4. Verify the last stateString matches the current state
const
currentJcs
=
jcs
(
state
)
;
const
lastStateString
=
stateStrings
[
stateStrings
.
length
-
1
]
;
if
(
currentJcs
!==
lastStateString
)
{
return
{
valid
:
false
,
amount
:
0
,
error
:
'Last stateString does not match JCS(state)'
}
;
}
// 5. Derive expected taproot address
let
address
;
try
{
address
=
btAddress
(
pubkey
,
stateStrings
,
network
)
;
}
catch
(
err
)
{
return
{
valid
:
false
,
amount
:
0
,
error
:
`Key derivation failed:
${
err
.
message
}
`
}
;
}
// 6. Query mempool for UTXO at derived address
try
{
const
resp
=
await
fetch
(
`
${
mempoolUrl
}
/api/address/
${
address
}
/utxo`
)
;
if
(
!
resp
.
ok
)
{
return
{
valid
:
false
,
amount
:
0
,
error
:
`Mempool API error:
${
resp
.
status
}
`
}
;
}
const
utxos
=
await
resp
.
json
(
)
;
if
(
!
Array
.
isArray
(
utxos
)
||
utxos
.
length
===
0
)
{
return
{
valid
:
false
,
amount
:
0
,
error
:
`No UTXO at derived address
${
address
}
`
}
;
}
}
catch
(
err
)
{
return
{
valid
:
false
,
amount
:
0
,
error
:
`Mempool lookup failed:
${
err
.
message
}
`
}
;
}
return
{
valid
:
true
,
amount
:
depositCheck
.
amount
,
ticker
:
depositCheck
.
ticker
,
address
}
;
}
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