{
  "manageEntity": {
    "action": "Save",
    "entityId": "292100231",
    "entityType": "Track",
    "nonce": "0xeebdb9f7a314212518a1f069e62a6c336d9d7a7f26bd06849ad0ca401745dfd3",
    "signature": "0x73419de1e65fa2ef27fbf0268a0f70e0db25df451a1a10ce842ab318afcc54d33334477c8559d78eb2e7d7ad03f956fa9addf9dada85ed7bc82b095bcb3cb0ad1b",
    "signer": "0xF66719AC0E8463f8c9660B4412B4972e1dB48183",
    "userId": "57021"
  }
}