{
  "manageEntity": {
    "action": "Save",
    "entityId": "1645475014",
    "entityType": "Track",
    "nonce": "0xd0d50d845d77064818e9c270ebc493c2e842f92bd733972c942243b4c98e432b",
    "signature": "0x1bd58c143ee688bcec8e7e3f38964690dc1b2772088d58826741fd23b7b78c670e48174b55a6a7e784117c6566107b4ad12a9c4b2b121c47e8492a0b250098d11b",
    "signer": "0x94e0dDC50579175818AaCFBC9aba8B065fEf2a55",
    "userId": "460147282"
  }
}