{
  "manageEntity": {
    "action": "Save",
    "entityId": "655358716",
    "entityType": "Track",
    "nonce": "1785496480861089070",
    "signature": "0xa98f7960edae0e4459623f2ff83d3e12aeae0895ab61fadac5fbfdb1b011f2f326581abdd68b62f0199746f9379715f7fc81a97fb9993f8a7c121213206dfa4f1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}