{
  "manageEntity": {
    "action": "Save",
    "entityId": "687476632",
    "entityType": "Track",
    "nonce": "0x94a94607e0e7ade15aad435f035e2d963ecdd6afc701a45f1023cb6a1bd2ac12",
    "signature": "0xb4d4501991e2cd7580e3024b21595598dcb2fe27491670ac14998569e89adf0f210f0d83d6af7e6877477f54ba07d385c7481079e84cef55006d9bcd935fe5e71c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}