{
  "manageEntity": {
    "action": "Save",
    "entityId": "1470257621",
    "entityType": "Track",
    "nonce": "0x5366ef7ac9c31ece6b1f654b48f4aea4f02e233c30af8723806405fbfa2e367f",
    "signature": "0x9af8f87068056a67bff9933bccd0a62fc214bf0bfa6883f0d343e075f0940dfe7c93a27d4a67809becd229234f47aeec29356ee6173bc9de667e4b605c23dc871c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}