description of data storage in RocksDB

README.md

@@ -43,4 +43,42 @@ go get github.com/jpochyla/blockbook
 
 ```
 $GOPATH/bin/blockbook --help
-```
+```
+
+# Data storage in RocksDB
+
+Blockbook stores data the following column families
+
+- **default**
+
+  at the moment not used, will store statistical data etc.
+
+- **height** - mapping of *block height* to *block hash*
+
+  *Block heigh* stored as binary array of 4 bytes (big endian uint32)  
+  *Block hash* stored as binary array of 32 bytes
+
+  Example - the first four blocks (all data hex encoded)
+```
+0x00000000 : 0x000000000933EA01AD0EE984209779BAAEC3CED90FA3F408719526F8D77F4943
+0x00000001 : 0x00000000B873E79784647A6C82962C70D228557D24A747EA4D1B8BBE878E1206
+0x00000002 : 0x000000006C02C8EA6E4FF69651F7FCDE348FB9D557A06E6957B65552002A7820
+0x00000003 : 0x000000008B896E272758DA5297BCD98FDC6D97C9B765ECEC401E286DC1FDBE10
+```
+
+- **outputs** -  mapping of *address+block height* to *array of outpoints*
+
+  *Address+block height* stored as binary array 25 bytes total - 21 bytes address without checksum + 4 bytes (big endian uint32) block height  
+  *array of outpoints* stored as binary array of 32 bytes for address + variable length outpoint number for each outpoint
+
+  Example - (all data hex encoded)
+```
+0x6FCB8DBDD6F207F559162EF3BBD4229911DA248C3000000029 : 0xC459D961CC607A12AFDC6A8A200E84F1AD8E2021C2745FE12E0231DD90CA46BE00
+0x6FCF12C87234AF9C402246B1A5D5C3F937337E6ECC00000013 : 0x73A4988ADF462B6540CFA59097804174B298CFA439F73C1A072C2C6FBDBE57C700
+0x6FD3F80654BDA100BB704FBAF49E759E6084AB10DD0000005D : 0xC12A5ACAE3EFD788F088FCFA6D267ED48681A1AE4D2F477BFA60C0500274B6BE00
+0x6FD5D788B43528CF8AF3EFBB050060B1BE26A54B4600000033 : 0x67F41C86F443AC7E00F494DD6B5DB2E999AA64E77A537728096CE4AB32F3170D00
+```
+
+- **inputs** 
+  
+  tbd