{
  "manageEntity": {
    "action": "Save",
    "entityId": "189970",
    "entityType": "Track",
    "nonce": "0xa623a52f5ff966da4e9387467e99c3507b47536f2e9703a1b75b1200c4001961",
    "signature": "0xfb086f90fecf92b50a8dfe99c1a8450d2c7561f3e56174d729a773767bd37d3b0a0e866356a86fc464f5da171d6dfb3337392f045db37474a92799fdc49cbf8e1b",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}