{
  "manageEntity": {
    "action": "Save",
    "entityId": "177751",
    "entityType": "Track",
    "nonce": "0x9a4cad14be40338e6d079cec9623facce7ea5955d687656687426237c7ff2e29",
    "signature": "0xd1fdf39984fd31af95355f163bd1bac35b7c695c395cc9928a1c8dfb59edb7b94c480b518e3ac22732b3ed24a8ee9445fb441b70d19ea2890e4475a014068cdb1b",
    "signer": "0x8FF85C5AA450a88f13FbD5170e24E2a3eFF32518",
    "userId": "311829956"
  }
}