{
  "manageEntity": {
    "action": "Save",
    "entityId": "169319",
    "entityType": "Track",
    "nonce": "0xd964cd5fc5683148eabc43b26378bcaa647823cb4a2398f1417ea44dbd4caba8",
    "signature": "0x0af5238a3845d75dd15174407f81bbb703ba2aff5df3d4b5b4433514a2cd90983d0355148bb99b1317e3ca926e08a6f9c8f07c16b1b76b3374e7d0037e11042a1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}