{
  "manageEntity": {
    "action": "Save",
    "entityId": "663779740",
    "entityType": "Track",
    "nonce": "0xe0a03580088844d1620967e1d6a0c1a7ca5e4b0b20d758d74db1e21064dea188",
    "signature": "0xd46d432929bac31dbd6f7b71dd8789f0adc0d3fb0abff06c4bddfb1af61c3ea0091d7975e06a498e5a17a7ef4bfdd56fd42d362885c01f68da9f297ec35941db1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}