{
  "manageEntity": {
    "action": "Save",
    "entityId": "73776572",
    "entityType": "Track",
    "nonce": "0x2114bc5bca08d5c92d064d54ca4cef3a08098fa3cb574f351d9d6788a084ea19",
    "signature": "0xd328a61e593ddce87714f6ab2bcf25e8ea47ebdc6a8421a36bbd3d2989ecfe6e2137448e5c483897ee9cacdb546571e6cb7b6fd4ccc9d5b5e743419a8a2799361c",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}