{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616390022",
    "entityType": "Track",
    "nonce": "0x3e6913172b6b24279304a6d9c3d23eba6d394983d69c1e7bf14d62137f150040",
    "signature": "0x445d0f1b06c07e846b7b00db8333028fb6bbfc309698bb91f0d8d82ca9cd95b54d0cdb9507c5de3a096511577e59920da95eb0df89836eb5f6777ba122224b141b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}