{
  "manageEntity": {
    "action": "Save",
    "entityId": "776997501",
    "entityType": "Track",
    "nonce": "1792265755782782935",
    "signature": "0x9c60c239e38464aea21d61e9bfc943a7455283b2d301a894d9e96ef5b1b50f9323e978f3c4bed4877bd6198366f0fa44e8c7da1ab1e6350cea1bac864bae31bf1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}