{
  "manageEntity": {
    "action": "Save",
    "entityId": "1613204471",
    "entityType": "Track",
    "nonce": "0x865d316d28e61d3669f58a22bc3c0fdee0cbae13743d472c38b86e107d780747",
    "signature": "0x54e9ccd2af8c5edf93411699013f03a6c96c59bd7e618623638422643c2412812db88d9bc89c0d104b89e68dc37f6b16d8bc3c408176e31d38672ddd4cad2cd51b",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}