{
  "manageEntity": {
    "action": "Save",
    "entityId": "675624208",
    "entityType": "Track",
    "nonce": "0xf6b9bcc6a8daf7defaedb5ac860ada250859e367e280e3d74918190759311a8a",
    "signature": "0x8800b03690dac48e978961631a1987dda308d7ee4c6ca2d5e6038359f2021e411010b8af0fb67c2b208095a74712936743744820b49f466ac9e20240302b97001b",
    "signer": "0x2F7db4C1AE3922aD0f32CEdED1870278dd17b64b",
    "userId": "467213409"
  }
}