{
  "manageEntity": {
    "action": "Save",
    "entityId": "1401777506",
    "entityType": "Track",
    "nonce": "0x9851acdb31a16bf2b51e8ea2a3df9ba5a1bfe34b5a6823587656587d3ee852d2",
    "signature": "0x77de56b270c074a851a7516dff4d4cd57d89243ea1ba8d6d6aefb81a532243d115ba2b91bfdea39bd8698e7b6e57c5d8d02e5da4e79c510fa2828ae33fffe7411b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}