{
  "manageEntity": {
    "action": "Save",
    "entityId": "392505417",
    "entityType": "Track",
    "nonce": "0xfe8283314bdb876fc5c8e0fdbefc6ee5585c034dd1fbd86d342f92e271ef5e13",
    "signature": "0x1ab40b388c7a98e773de4398772aaab0484f653e2888bb19bb22c032b2e47de800fd7e3d7908ac96a9b67cfcf83ff6c8cae563e11f4dde6a942b55b0a09fa77c1b",
    "signer": "0x1F9dC682fadBAc94c0Dd4ca2232a3f490704a737",
    "userId": "737872723"
  }
}