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land

Land

LAND is an irreplaceable digital asset maintained in a Newton blockchain smart contract. LAND uses the Andromeda coordinate system. Each LAND contains its coordinate value, its owner, and its type.

Coordinate System

Andromeda uses a coordinate system that is public and compatible with existing blockchain metaverse (e.g., DecenterLand) and Internet metaverse projects (e.g., Facebook's renamed Meta). Its basic structure is as follows.

Ω(1, 2, 3, (4, 5))
  • Ω: represents this set of coordinate system, using this coordinate system and fixing the use of this character.

This value needs to be recorded in the contract using the constant string AND_SYMBOL = "Ω"

  • 1: Metaverse ID, the number of the metaverse to which it belongs, representing the metaverse item

Refer to SLIP-0044,

Metaverse ID is registered as follows.

Metaverse IDSymbolMetaverse
0NEWNewton Metaverse
1ANDAndverse
2METAFacebook (META)
3LANDDecentraland
4SANDSandBox

The metaverse and the galaxies, planets, lands, etc. that it contains are required to provide function metaverseId() to return the metaverse ID.

  • 2: Galaxy ID, the number of the galaxy it belongs to. This number is maintained separately for each metaverse, where the Andromeda metaverse has the following galaxy number.
Galaxy IDName
0Andromeda Galaxy

The galaxy and its planets, lands, etc., need to provide function galaxyId() to return the galaxy ID.

  • 3: Planet ID, the planet number. This number is maintained separately for each meta-universe, where the Andromeda galaxy has the following planet IDs.

Planet ID | Name | Name 0 | Planet 0 (blue planet, origin of life)

Planet and the land it contains, etc., according to the functin planetId() that needs to be provided to return the planet ID

  • (4, 5): the coordinates of the land in the Cartesian coordinate system

Coordinate distribution of planet 3

  • First sale coordinates range
    • from (103,103) to (256,256)
    • Coordinates reserved by the system.
      • Plots that match x == y or x + 1 == y or x - 1 == y
      • Between (165,165) and (194, 194)
function isAllowed(int x, int y) public pure returns (bool) {
    if ((x == y) || (x + 1 == y) || (x - 1 == y)) return false; // x3
    if (165 <= x && x <= 194 && 165 <= y && y <= 194) return false; // 30 x 30
    if (103 <= x && x <= 256 && 103 <= y && y <= 256) return true; // [103, 256]

    return false;
}