{
  "manageEntity": {
    "action": "Save",
    "entityId": "1293975230",
    "entityType": "Track",
    "nonce": "0xc767b9e2a470a40e7a218ce0872fb4c4d48735db28c76ba546448f7b4a729527",
    "signature": "0x4fea3e02b7449d48a47a4752e2a50949d7deaf9087bdee8e269ff75cd5b14a825a62f77eda0f07a159631dbd3d4f867cd8a73cb322b711c316f38dac790251071c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}