{
  "manageEntity": {
    "action": "Save",
    "entityId": "1475459501",
    "entityType": "Track",
    "nonce": "0x555d3e117c93d7ce587efdc93a64f09a941be4b5fcb62fa0a51d5d41ed89006c",
    "signature": "0xa2a0820a8a1e9e13bb4e18b9f1e6c4ddf1b68db8d5ad7c5cd2d2c4c5b7d8a35715d278f62d573f58442b95b95bb9d81f4e750aa0759e75605792d764ddd7e9111c",
    "signer": "0x3e4953461b6671604B2E8fcD0BdB628DF4C16609",
    "userId": "167051786"
  }
}