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Add checksums to descriptors.md

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Pieter Wuille 2019-02-08 12:03:32 -08:00
parent be62903c41
commit fd637be8d2
1 changed files with 18 additions and 1 deletions
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doc/descriptors.md
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@ -39,7 +39,7 @@ Output descriptors currently support:
## Reference
Descriptors consist of several types of expressions. The top level expression is always a `SCRIPT`.
Descriptors consist of several types of expressions. The top level expression is either a `SCRIPT`, or `SCRIPT#CHECKSUM` where `CHECKSUM` is an 8-character alphanumeric descriptor checksum.
`SCRIPT` expressions:
- `sh(SCRIPT)` (top level only): P2SH embed the argument.
@ -169,3 +169,20 @@ existing Bitcoin Core wallets, a convenience function `combo` is
provided, which takes as input a public key, and describes a set of P2PK,
P2PKH, P2WPKH, and P2SH-P2WPH scripts for that key. In case the key is
uncompressed, the set only includes P2PK and P2PKH scripts.
### Checksums
Descriptors can optionally be suffixed with a checksum to protect against
typos or copy-paste errors.
These checksums consist of 8 alphanumeric characters. As long as errors are
restricted to substituting characters in `0123456789()[],'/*abcdefgh@:$%{}`
for others in that set and changes in letter case, up to 4 errors will always
be detected in descriptors up to 501 characters, and up to 3 errors in longer
ones. For larger numbers of errors, or other types of errors, there is a
roughly 1 in a trillion chance of not detecting the errors.
All RPCs in Bitcoin Core will include the checksum in their output. Only
certain RPCs require checksums on input, including `deriveaddress` and
`importmulti`. The checksum for a descriptor without one can be computed
using the `getdescriptorinfo` RPC.