Before I begin this section, let me just say that an AMM (Automated Market Maker) is only an example of the type of protocol that we should be considering, it is not in itself the problem. Because it requires several capabilities currently missing from bitcoin, it is a useful example.
Given the existence of the CATNIP token design as discussed by Ademan and
| CTV+CSFS+CCV Symmetry | |
| 166 | |
| update-script: 33+33+5+23 = 94 | |
| stack: 33+65+33 = 131 (or 0) | |
| | (<settlement-n-hash> <sig> <update-n-tree> | ) | |
| DEPTH | (<settlement-n-hash> <sig> <update-n-tree> | ) <3|0> | |
| <key> | (<settlement-n-hash> <sig> <update-n-tree> | ) <3|0> <key> | |
| SWAP | (<settlement-n-hash> <sig> <update-n-tree> | ) <key> <3|0> | |
| NOTIF | <key> | |
| <settlement-i-hash> | <key> <settlement-i-hash> |
| <n> <c> <e> // n, c = RSA key len, e = 3 bytes | |
| | n e c | | |
| TUCK | n e c e | 512 | 1024 | |
| 1 | n e c e 1 | | |
| AND | n e c 0/1 | 257 | 513 | |
| IF | n e c | | |
| DUP | n e c c | 512 | 1024 | |
| ELSE | n e c | | |
| 1 | n e c 1 | | |
| ENDIF | n e c c/1 | |
| const { ECPairFactory } = require('ecpair'); | |
| const btc = require('./src'); | |
| const ecc = require('tiny-secp256k1'); | |
| const { secp256k1, schnorr } = require('@noble/curves/secp256k1'); | |
| const psbtutils = require('./src/psbt/psbtutils'); | |
| const { reverseBuffer } = require('./src/bufferutils'); | |
| const { REVERSE_OPS: rOps } = require('./src/ops'); | |
| btc.initEccLib(ecc); |
| quine-script = IF TOALTSTACK TOALTSTACK DROP CTV IK CSFS VERIFY FROMALTSTACK DUP 3 SWAP VAULT FROMALTSTACK CLTV ELSE 2DROP CTV ENDIF | |
| state-n-hash { nLockTime(S+n), out(contract, amount(A)+amount(B)) } | |
| settlement-n-hash { nSequence(2w), out(A, amount-n(A)), out(B, amount-n(B)) } | |
| S = 500000000 | |
| IK = A+B | |
| Script = CTV IK CSFS VERIFY <quine-script> DUP 3 SWAP VAULT <S+1> CLTV | |
| Tree = Script | |
| Stack = 0 -1 0 <settlement-1-hash> <S+2> <sig> <state-1-hash> |
VAULT quine:
| op | stack |
|---|---|
START |
{1,0,<release_sig>} |
<counter> |
<counter> {1,0,<release_sig>} |
<leaf-update-script-body> |
<leaf-update-script-body> <counter> {1,-1,<release_sig>} |
TOALTSTACK |
<counter> {1,0} |
DUP |
<counter> <counter> {1,0,<release_sig>} |
NOTIF |
<counter> <release_sig> |
This proposal is an alternative to [bip119][] and [bip118][], providing the functionality of both proposals with minimal additional overhead in many cases, while clearing certain objections to both, and opening clear upgrade paths.
This is, in essence, an initially constrained version of Russel O'Connor's [OP_TXHASH+OP_CSFS proposal][].