{
  "manageEntity": {
    "action": "Save",
    "entityId": "603403389",
    "entityType": "Track",
    "nonce": "0x3446ecadaeb4f90fa548b23eb5bb0a046616c64c3aec815f2c8ca209216de60b",
    "signature": "0xf1be7e40593293a4b82b25a1d194b0c239e18a219a6327af72d106131ae5b4840f861481f2d58c8b91d25e4e5d08b824617b4d9835edef5cf638814359ecf3531c",
    "signer": "0x53d8e61f7BdCd69E26B5AAe8F197464091224DB4",
    "userId": "99786"
  }
}