{
  "manageEntity": {
    "action": "Save",
    "entityId": "1448426947",
    "entityType": "Track",
    "nonce": "1789902056976124269",
    "signature": "0x0890740c92c9cf474264fbfb77c4c1dd5b5bac5a445933a866ce5bb5aad1e6d81d8aae012c12ced6f2713e38dbfbf7a459106294e38bb75c5341919a650ffed61c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}