{
  "manageEntity": {
    "action": "Save",
    "entityId": "200646672",
    "entityType": "Track",
    "nonce": "0xbe90e6127fa2e0f08aa02ae87e4ff57e0ac2026588f97fb880d247b2fa6a3565",
    "signature": "0x0e498553b35d2bc56e74e50ef1dbdee248eb5b3d6a925a9ae2f6040bb4b5767872aa6b26a666ea7c887b92a07316f12dfcdae2d793be87438771c6f5290030781b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}