{
  "manageEntity": {
    "action": "Save",
    "entityId": "1373562858",
    "entityType": "Track",
    "nonce": "0x189373eb4e2de7de21f6c879624a31868e2df2ee3f87e9f15f9117043558666a",
    "signature": "0x193756321ac4001e9f0eb510f1e562d74014f94b9e43997f867a47e572f072135e9e0f5d02a7290daa3a04b22fe3b9a6961a4cbb8677bd6199e018be418b00ae1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}