{
  "manageEntity": {
    "action": "Save",
    "entityId": "336518",
    "entityType": "Track",
    "nonce": "0x57c026c166e16ab3606bea22ba1904761fa2d2a1aa1cf94ddc6d547067b1f74b",
    "signature": "0x02aaef1c1d2f4af7c268b57aec84bf16bcd1e75406142683fda19af69a06b3902eba8991c4066d0b438580155c35bcbb499765d25e5e6057eb0dcaf9c3dd62771b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}