{
  "manageEntity": {
    "action": "Save",
    "entityId": "690943",
    "entityType": "Track",
    "nonce": "0x0e2a299c0a1d3e4e962f5bc8fd6edbb0c897bce818bd1151bb0cd4cc462412f4",
    "signature": "0xb04f9f0f61d39f4d1fb1d06722de0bd606a822f1e05d1d3faa480a9d29a54a697ad06304cf78e4ebc5e32acfce3736e70c76724c26f5ff969ed24f814208ae7d1b",
    "signer": "0x97eAfE883FbF33a8b75f6f37440caFE5CC452d3f",
    "userId": "849776474"
  }
}