{
  "manageEntity": {
    "action": "Save",
    "entityId": "1620961661",
    "entityType": "Track",
    "nonce": "0x4a98dc1051040f769a0dc4fe7bc508f2d9ede939da20551af9510eccdae2722a",
    "signature": "0xabfbdc4ad1bd3683adf6614e52205c496aaab92a7caea51d3fd8711341df554417b1c50accc3163b7a09f739fb9ce2ee38be4a603611800f35096a61f3d101101b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}