{
  "manageEntity": {
    "action": "Save",
    "entityId": "493555464",
    "entityType": "Track",
    "nonce": "0x5aafd4d659b128424179de132992cd13418ef00a214d691cae3d725480aad152",
    "signature": "0x6a1270c66146152fed831db958985c86e291422f7f38f7993daf147881725fb143229e7d61c7b1598f836e85a9b92047da73b84851949cf9d70cd6a4ad673eed1c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}