{
  "manageEntity": {
    "action": "Save",
    "entityId": "1888645316",
    "entityType": "Track",
    "nonce": "0x2de20919bcdedb73653bde70423986cf3d342db855a2eddeee5bd9c3abbbe7a4",
    "signature": "0xbb4f1facda82df142848004243ada22678581e77d6511dbfdd21d9bd411edf7a639474465b6c8a611ac311cfccfb8a4ee7e2bbb1d24cec0038e34d6b845cbb021c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}