{
  "manageEntity": {
    "action": "Save",
    "entityId": "1899643373",
    "entityType": "Track",
    "nonce": "0x88f3e45106e9b26f127d44850527d5fefdb26ae8c504f0c3e98ecc6eb1dd077c",
    "signature": "0x844d9d4c669736ed6991a4f5cd328699f32332e49ab48f0d1bc062846eb13c26427376357053be2fb44badf1bd1e4f0ee26d55c3f7713afdfe6c239e517a52211b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}