{
  "manageEntity": {
    "action": "Save",
    "entityId": "490640813",
    "entityType": "Track",
    "nonce": "0x89526a75b8b6a3edf20755cc203427a363ec4d589b097446402ca9541cf14d32",
    "signature": "0x5bf3c0ada1904a1e08fbf3751f2f67a35312d1716fe3e2686c790346f4945ca67ca44eb20fe0e8e369e4d3dccda0ee9c2980842a5b6d21f2c2e2331f412cf8981c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}