{
  "manageEntity": {
    "action": "Save",
    "entityId": "1573383441",
    "entityType": "Track",
    "nonce": "0x90d4273ba16557b6237c88a3e72e117afc4ad1e1100273adf59d8ae2bb64795f",
    "signature": "0x5b9894381cb59c5b9b589d5bda0fc34faa8ff67ff35decb7fb5f1dfaf9012c041ac4cfdfe20210292258ec25db14b82fae41a5645c3d5a5371dc5143903c953a1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}