{
  "manageEntity": {
    "action": "Save",
    "entityId": "154646",
    "entityType": "Track",
    "nonce": "0x87de4c09cfadee66749f0cb431ef5fd403039253abd40655c17289cf2a7c7c2b",
    "signature": "0xdbecb5a70d24a424a4179e8e8b10bcfa9b3a346f3290cd4466e5054312da40a50b9346821390caab8ba1a3e97e357bb95be98d632880406f9890a825b1d17dcc1c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}