{
  "manageEntity": {
    "action": "Save",
    "entityId": "1639970499",
    "entityType": "Track",
    "nonce": "0xf7fe20c0f9690f3900baabb6d8c99e50c33cfeb58ea2c2ac703392822c6757f2",
    "signature": "0x5a2892eb4a02e270a8b77ae6b32c8a0b95c1be28b1a1bdfa5168e58b8260b047099ae5c2033508122c6f1182f1a71487a3c75751dbc5d8d8448b00dcf173bac71b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}