{
  "manageEntity": {
    "action": "Save",
    "entityId": "449358757",
    "entityType": "Track",
    "nonce": "0xc5ac2cbcf050fbbffc5b09bb75ab6155b538d32b3c03d564cbe629d3004fc17a",
    "signature": "0xdf9036e93ff7431a05cd0535a6a827978374cf4810b7e31fa7720836d2a85d6946f578898c0c9fe7457427a6ea1f31935f46c6337a7e1668d7e4a68cf08325621b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}