{
  "manageEntity": {
    "action": "Save",
    "entityId": "599549",
    "entityType": "Track",
    "nonce": "0xb503eb59dd735d1f9e321b4987de00585beb6b549257afcb54ca2bde9ff59712",
    "signature": "0x0327c9c5db901ff2b95198ace0a6e1c60fbcf393b9045caff970e7bd78c0f36c087f0a933f656c3e330969bf48ec42852a7f51b2c857820c04a6906cd6d806cc1c",
    "signer": "0x8f0A5939761dE5f6b984a401d42E21b5B3023674",
    "userId": "925049268"
  }
}