{
  "manageEntity": {
    "action": "Save",
    "entityId": "1697573509",
    "entityType": "Track",
    "nonce": "0xc57edb0b6c2371547f394f0908bb74688a1bb30c4d2c72d21f3bf91d28ecc105",
    "signature": "0xcbc565ee85a5304bd760bb27d7ec9eae345ce4283834682be1a5d4df088d0d1b1c0bf25f15e0aa3b82fd0af4dabfd7a586fca73aba1bd6584a85433af5fa76331c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}