{
  "manageEntity": {
    "action": "Save",
    "entityId": "8589",
    "entityType": "Track",
    "nonce": "0x5b5627f63eb7bcff174638cf49505deb28c42f8ff4e2800ed18858e4b6920b16",
    "signature": "0xd7dec75ccfab9de21fed15f47053a4e427ace19f5a426b3e76d6e710336742d4269164282ab6b484996471c17fd662af8d131d249b97260368daccf1bc3c01191c",
    "signer": "0xD7Db519a2A03374B0548c02822bE88402aef1E5b",
    "userId": "715241773"
  }
}