{
  "manageEntity": {
    "action": "Save",
    "entityId": "1556486381",
    "entityType": "Track",
    "nonce": "0x904bc1374d7876882ad3fedfbff5ea7ce727d87888056675893a5a3e01779d43",
    "signature": "0xd775e93021de3391c0a441b361e0e7443580a6d7403c81fe6e86b026e0c29524782366e1c4ecf3c61c2b12f23079cdbacc184827607d8243e462f7b88acd0e591c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}