{
  "manageEntity": {
    "action": "Save",
    "entityId": "428394",
    "entityType": "Track",
    "nonce": "0x92fa111d3a5e5dfc112c53aec6b165563917c696f6d53864d068fd59879ae6e6",
    "signature": "0x5b7d5617c8dad0765fe4ce4a5ce63dd95f517b299aaf7d76d367d03205d051a53c00535737cccbc94c2f94174e4bc9f50530875fff23f3f3619f6b305bc593551c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}