{
  "manageEntity": {
    "action": "Save",
    "entityId": "720750639",
    "entityType": "Track",
    "nonce": "0x44870d67d5b77247e9c2111c39d26f26906af049bcb56bb42836cc81a05df409",
    "signature": "0xffa5674a30195e2f9c0d5a34f4083afeeccb70db5dfdec57345b2b74b39183ed79c68ce8ffb246bdc0b0d03789e80ff199c3191c5022d73d7ce7ddb15e4852051b",
    "signer": "0x304351A649d22355BBE9FA748D7632fa878fA9f3",
    "userId": "848226921"
  }
}