{
  "manageEntity": {
    "action": "Save",
    "entityId": "667476298",
    "entityType": "Track",
    "nonce": "0x9f547ad41a48b2b36e8e10ea7edf7e3a65664df4fffc69412b48b156c258f11a",
    "signature": "0x7b5436d5084d18a22af173912a42a955e471ba2899f9c37ff4fe7076bc779d2c74c507977beb56101a983bbe6d47d62ffa1a78e2f572771b54e9950265c9822b1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}