{
  "manageEntity": {
    "action": "Save",
    "entityId": "605441455",
    "entityType": "Track",
    "nonce": "0x0a26918f9d37fa9664916e1d65c7d1f8e8cb5220e73f01ab689c2d8cdc5f7a9a",
    "signature": "0x61937c4691056a810f17830b6e16be63bceed49f074cc0177f905bd8263b21f32af4bc2e3a3e7b2f5c93ce097bd98895dfcda653dd57b3f9db669f868c0229891b",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}