{
  "manageEntity": {
    "action": "Save",
    "entityId": "670438500",
    "entityType": "Track",
    "nonce": "0x02552932fb418b3b1a380f4b3dbb23813382fccc94b4d764d4406e40b2c0a146",
    "signature": "0x9a594c727283cf2073633119e83e667a9bbcfb45d2d7b8e317ab0f3c44ffa3ff1fa75a6df67fd5cd157ecde69c758675e5b36415942f2415c4e891f99a88fa611c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}