{
  "manageEntity": {
    "action": "Save",
    "entityId": "1597619221",
    "entityType": "Track",
    "nonce": "0x40b38b3ab701ffeacf862b360529619d607dcf82bd71fd03f8aa288589b33d51",
    "signature": "0x21b8bb8580c52e1a6e21786695e4bf7bca1cf57d2d99c74999362e7e3922f2e2615f259c19de97799927fc781df90a960eb1926aa278ed0631d6cc2f34829ab01c",
    "signer": "0x742Fff9be20F80Ce7285c8Ab12B9018Ef3Cf14F0",
    "userId": "111467392"
  }
}