{
  "manageEntity": {
    "action": "Save",
    "entityId": "815887057",
    "entityType": "Track",
    "nonce": "0x42e50918297e00a25bcebd569e1a1d6085d80352bc5c4d2b097758dd047cf0ee",
    "signature": "0x63226258de24ef85da5b3e40aa8c88ced1465e7a2f6b4bcc9b11c2fa98a40433383e59a445547d35d0c7d9561feac9de3aa329dd1266a7389d5e20da6d8f89e71c",
    "signer": "0x7b52e6AA15Db4Fc3A84AFF2b12e5B8B128eA8610",
    "userId": "808512351"
  }
}