{
  "manageEntity": {
    "action": "Save",
    "entityId": "664017428",
    "entityType": "Track",
    "nonce": "0xd9a9c960764a41d7ccf253f7ce82aeccf47b949fb2b6cfa77a6a3f2bb7788b87",
    "signature": "0xc75abddec044544b126f1f08bc21e2b804f0a6f83da87d622af8057c91a4aea056d95cce81176fc72518b89e336207a8950146a531aa19e848ae1ec86be1da901c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}