{
  "manageEntity": {
    "action": "Save",
    "entityId": "1581420500",
    "entityType": "Track",
    "nonce": "0x5912c2114e71068360021160e6ac2963de1b942d09d83ae6ee6e79d80a543057",
    "signature": "0x99ec1887beb0dddbbb3b269b171417323bd111049235d295a82cab097cd128517032457fbc2495032a2c5bd1ec7ba2a796a2b7f7691c582a0ab9459f2de6d4101b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}