{
  "manageEntity": {
    "action": "Save",
    "entityId": "1585738050",
    "entityType": "Track",
    "nonce": "1788185107014389781",
    "signature": "0xfe904556abf2bdf90946b479c0486b8ccd467a37be0c650e850be683f70b619e6e760877cf34e3658e5f59b309a640aca55af2b0b9b93094ff7d0de73803a8431c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}