{
  "manageEntity": {
    "action": "Save",
    "entityId": "1669893231",
    "entityType": "Track",
    "nonce": "0x24757871c67d50fd03ba955159cbbedd6a697150bb614c3cbef580aa7dc43387",
    "signature": "0xb9253acebcc508ff9c7fb7e2232446495b5ec0a7bba10b57260bc3c33d6f1df748513b1e5822f646ac440e233c12f3073ffff6c3c289eb3c5d879be150e8cf4c1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}