{
  "manageEntity": {
    "action": "Save",
    "entityId": "1428416866",
    "entityType": "Track",
    "nonce": "0x3a381310c015f7a8fd6eabd065e71f780b09f24ba87279780ca2c602069629cf",
    "signature": "0x21ed15221bf2cd66b638dcead45cc92f325062fee3592ede7b372f21f704f2a51a85a235c4aa1842cd2aaa6421ca56eda0928eb53febb591813b71c1a5990c101c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}