{
  "manageEntity": {
    "action": "Save",
    "entityId": "473037549",
    "entityType": "Track",
    "nonce": "0xcc1d1a655e9304d5dd2a25082168083cb6106eb44bacd022edabed37cfdf043b",
    "signature": "0xefb45091bfb3905bc8f659d76061f0da0949dd458f9ae07691a2e2909be03f412d7365c87291c55d74ad3fa3e1b8f18430b2ef3f41f7c065c16520b27c5485921c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}