{
  "manageEntity": {
    "action": "Save",
    "entityId": "381793",
    "entityType": "Track",
    "nonce": "0xefeb50cedc58f7d3a6f426e772bd2db01a77acd1f8f83cce4475099b2afb857b",
    "signature": "0x6221d03aec727c96276994e4b44c4498ba7b3af2f6952737a315264fb7d5c56b0390aa6dfb27d61871f75b94392f27aeac731a25a4e6c763c0e5102be59a46741c",
    "signer": "0x261c17dd7171Ea18B7ffF1AbB7D0495fEa0dB0ad",
    "userId": "185086709"
  }
}