{
  "manageEntity": {
    "action": "Save",
    "entityId": "42146514",
    "entityType": "Track",
    "nonce": "0xc7bfc9f3b28bcb490571bab70c3f20e2ecaa529176a11c648028a84f4861fdad",
    "signature": "0x3a78a7974a0572b5af44b7c98b6bf36e7a88f10dbe095d03119f7105a62d90c23856a88040ecace8b76d4ccb53f1a55dceadb7af724a49986705d0068bb9dbd21c",
    "signer": "0xe03E67fd5b282e9ebd9109D47BE03E88AcE9B063",
    "userId": "420170492"
  }
}