{
  "manageEntity": {
    "action": "Save",
    "entityId": "207915571",
    "entityType": "Track",
    "nonce": "0xcce8f1e395a74d9425bc3c36a4709af5371add72be5018542522a589da51defa",
    "signature": "0x58f8510380548474f4fdf93636792c60e688dfc1b322f0f35cdddc2446df02176853dabb021878c81a30482b315453792bf2e3fba60c215c8f141271667334f61c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}