{
  "manageEntity": {
    "action": "Save",
    "entityId": "402473953",
    "entityType": "Track",
    "nonce": "1789623825477964326",
    "signature": "0xa593c5ce064bd62207c14a9b60fe75c168e533d114624c45f868c120ed6aac7d31c4f0bf0b4579d18fff6d11f29930810b7468f58b169a1d167d42fed97563141c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}