{
  "manageEntity": {
    "action": "Save",
    "entityId": "225810238",
    "entityType": "Track",
    "nonce": "1790195311836973460",
    "signature": "0x77dd05bc69588c95fa623d612e3331b92e1e1eedf272b16caba6826ee213e16e206d1bc8c2c7b7d6dd056032f95d72d3af409f4367d873279d47193051fdf75a1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}