{
  "manageEntity": {
    "action": "Save",
    "entityId": "516103172",
    "entityType": "Track",
    "nonce": "0x0cc3bf7aae61a0b99a19fc2640dc83c057097ed5a7ec99a10ca031b5b75d2a85",
    "signature": "0x2788ba49a33bc2e690ed5a2609647539e580fb2bd130877ed03770a7d2c0d8b24db889bde55a288f5e85aec6aa85b52db59d02dac7200c8f869493dffd6708391b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}