{
  "manageEntity": {
    "action": "Save",
    "entityId": "1663136457",
    "entityType": "Track",
    "nonce": "0xc78894d593ef6e9b4d944e81aac4a00aa071564c31ac588805602d5d41dbf22d",
    "signature": "0xecb6675da38fbafe66273a26765affa9a44780deea84ae27822a5f13122b2c3b419a9f7cc8705d2f04686684cb4d6a347a7b1b27aa5b33eadfebf35da401b4ee1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}