{
  "manageEntity": {
    "action": "Save",
    "entityId": "278534557",
    "entityType": "Track",
    "nonce": "0xf890a11a81947529174458565aca1b82f767b240eac5c1bd10c6f94ac17a90b9",
    "signature": "0x2e4f4add73a34d0dbce611e9260fcd98288b4ccc50775c02d986916ba0843c5a6c9035978e7221e0e561552222ecc209d86f5d289d7c21f674dfa612108bd2c51b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}