{
  "manageEntity": {
    "action": "Save",
    "entityId": "148602",
    "entityType": "Track",
    "nonce": "0xa6d68f497494ef94c3e3b1dad8a64ff5550f6f52499ce2d0d4f822ce8c596a63",
    "signature": "0x2e80c4e0096928b5c2df7d6ce1dea283a2bdf2069c7d65ffdebd2f33bc3c14ac6cf3f8024f280abb76214020fb050caa870305637f4cbed246dad384e36de3dd1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}