{
  "manageEntity": {
    "action": "Save",
    "entityId": "1843821858",
    "entityType": "Track",
    "nonce": "0x8f9f2626b52a55172b6de1376274fba83f83a82707dbe25d6c6e6e2c5fd5bccf",
    "signature": "0x519e9469a52d7b823dbca6eb6cccb849c9ee8bf4efcc8ea615ae8f727ad9fbbf65b7319a820d7050faa3c14613962b741f909ae44f59d7e46e7b2c228c3b4f261b",
    "signer": "0x16Aa077b74922B66ea86D34Ca75b5d4C99c9D81D",
    "userId": "340690975"
  }
}