{
  "manageEntity": {
    "action": "Save",
    "entityId": "199758397",
    "entityType": "Track",
    "nonce": "0xa7fc6e34da356a44b2d1998a3bc3cec80bb73ecbc8ac5d4ef93e270a0c899fdf",
    "signature": "0x0eb385d459c579b4c1e8b0ee758925f6d1ff34b669f1c8a6b2f0c96a63cb482747462555c8199a6e3f8b7de3c16aefb5ace208bb813672f6b06eb94c7434730a1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}