{
  "manageEntity": {
    "action": "Save",
    "entityId": "821838933",
    "entityType": "Track",
    "nonce": "0x34bd6ab5d2363b33126acb4811da21a80774ebacb65543d034d51c90d79f6d31",
    "signature": "0xe6f9d972b93850a47fcd3e5829ed67a814823468eef8d7343c487e566c251be423595503363c5eec63038a17872f4cfef35a5c79b3c67779723e35e1bae402a01c",
    "signer": "0x6778772C8bEAc9AaE0A4a7faE307a5C48fE9245e",
    "userId": "548409021"
  }
}