{
  "manageEntity": {
    "action": "Save",
    "entityId": "144031504",
    "entityType": "Track",
    "nonce": "0xe39c726159cf57cf5b378d4cc7164344aa0e5d7c59ff21498cd7b3a477e2a58b",
    "signature": "0xa81c13c28aabbd292a089cf92a4b36b207c1f9264a34968278561ab80c62bc72730dfd757351a870675986089bbafef2ea446299f1a602334641b9e350443f9b1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}